Dangerous Radiation Research Articles

99MTC-MAA HEPATIC PERFUSION IMAGING PRIOR TO 90Y RADIOEMBOLIZATION: HOW THORACIC UPTAKE CHANGES MANAGEMENT

SESSION TITLE: Medical Student/Resident Imaging Posters SESSION TYPE: Med Student/Res Case Rep Postr PRESENTED ON: October 18-21, 2020 INTRODUCTION: Targeted radioembolization with 90Y (yttrium 90) has shown a survival advantage in advanced stage hepatocellular carcinoma1. Interventional radiologists perform this procedure, however nuclear, thoracic, and abdominal imagers play a key role in determining candidacy for this treatment via interpretation of 99mTc-MAA (macroaggregated albumin) hepatic perfusion imaging and accompanying CT scans2. It is critical for pulmonologists and thoracic radiologists to recognize normal and abnormal studies to avoid potential deadly complications in patients who are poor candidates for this therapy. CASE PRESENTATION: The patient is a 70-year-old male who presented with abdominal pain and was found to have multiple hepatic masses and bile duct dilation, which on biopsy was consistent with aggressive multifocal hepatocellular carcinoma. Additionally, he was found to have a partial portal vein thrombosis. Because of the extent of the disease he was deemed not to be a surgical candidate and therefore was referred for evaluation for potential 90Y chemoembolization. To evaluate candidacy, the patient underwent 99mTc-MAA hepatic perfusion imaging with chest and abdominopelvic CT scans. Results are shown in Figure 1. Scintigraphy demonstrated a pulmonary shunt fraction of 80%. DISCUSSION: It is essential to recognize that these results are highly abnormal and an absolute contraindication to 90Y chemoembolization. 90Y undergoes B-decay which can result in radiation pneumonitis when spheres containing the radiopharmaceutical lodge in the pulmonary capillaries. For 90Y sphere embolization, <10% lung shunting is considered acceptable for therapy. For patients with shunt fractions <10-20%, a reduction of spheres delivered is necessary, and shunts >20% are a contraindication to the procedure3. Notably, portal vein thrombosis is not a contraindication however should be considered in planning. CT and angiography are key tools for identifying the shunt. CONCLUSIONS: 90Y embolization may be a helpful tool to attenuate the progression of hepatocellular carcinoma, but carries the risk of dangerous radiation pneumonitis in patients with significant pulmonary shunts. It is essential for clinicians to be aware of the potential danger and able to recognize abnormalities on preprocedural imaging studies to prevent harming the patient. Reference #1: Jordi Bruix, Margarita Sala, Josep M. Llovet. Chemoembolization for hepatocellular carcinoma. Gastroenterology; Volume 127, Issue 5, Supplement 1, 2004, S179-S188, https://doi.org/10.1053/j.gastro.2004.09.032. Reference #2: Kao, Y., Steinberg, J.D., Tay, Y. et al. Post-radioembolization yttrium-90 PET/CT - part 1: diagnostic reporting. EJNMMI Res 3, 56 (2013). https://doi.org/10.1186/2191-219X-3-56. Reference #3: Livnat Uliel, Henry D. Royal, Michael D. Darcy, Darryl A. Zuckerman, Akash Sharma and Nael E. Saad. From the Angio Suite to the γ-Camera: Vascular Mapping and 99mTc-MAA Hepatic Perfusion Imaging Before Liver Radioembolization—A Comprehensive Pictorial Review. J Nucl Med November 1, 2012 vol. 53 no. 11 1736-1747. doi: 10.2967/jnumed.112.105361. DISCLOSURES: No relevant relationships by Kathleen Capaccione, source=Web Response Speaker/Speaker's Bureau relationship with Genentech Please note: $20001 - $100000 Added 06/11/2020 by Mary Salvatore, source=Web Response, value=Honoraria research grant relationship with Boehringer Ingelheim Please note: >$100000 Added 06/11/2020 by Mary Salvatore, source=Web Response, value=Grant/Research Support

High-Energy Radiation in the Space

In spite of long periods of exploration, comprehension of the space radiation condition and the hazard it stances to long-length space explorers stays restricted. There is a dissimilarity between research results and watched experimental impacts found in human space explorer teams, likely because of the various elements that limit earthbound recreation of the perplexing space condition and extrapolation of human clinical outcomes from differed creature models. Given the expected fate of human spaceflight, with endeavors currently to quickly extend abilities for human missions to the moon and Mars, there is a squeezing need to enhance the comprehension of the space radiation chance, anticipate likely clinical results of interplanetary radiation presentation, and create suitable and compelling moderation methodologies for future missions. To accomplish this objective, the space radiation and aviation network must perceive the verifiable restrictions of radiation exploration and how such confinements could be tended to in future examination attempts. We have looked to feature the various elements that breaking point comprehension of the danger of room radiation for human teams and to recognize manners by which these impediments could be tended to for improved understanding and suitable hazard act in regards to future human spaceflight

Estimated the concentration of 238U, 232Th and 40K in flour samples of Iraq markets

Flour is a nutritious type of food that is widely consumed by various age groups in Iraq. This study investigates the presence of long-lived gamma emitters in different type of flour in Iraqi market. Uranium (238U), Thorium (232Th) and Potassium (40K) specific activity in (Bq.kg−1) were estimated in (15) unique kinds of flours that are accessible in Iraqi markets. The gamma spectrometry method with a NaI(Tl) detector has been utilized for radiometric measurements. Likewise right now have determined the internal hazard index. It is found that the specific activity in Flour samples were varied from (13.73± 1.89) Bq.kg−1 to (2.60± 0.30) Bq.kg−1 with an average (8.75) Bq.kg−1 for 238U, For 232Th From (67.79± 0.44) Bq.kg−1 to (9.96± 0.14) Bq.kg−1 with an average (21.88) Bq.kg−1 and for 40K from (2680.74 ± 23.60) Bq.kg−1 to (283.70± 3.41) Bq.kg−1 with an average (133.09) Bq.kg−1. Also, it is found that the Outdoor and indoor annual effective absorbed dose equivalent also (Hin) hazard indices was (0.302±0.014) and average annual committed effective dose(0.2205±0.030) mSv.y−1 in the flour samples. This study prove that the natural radioactivity and radiation danger records were low also estimated cancer risk has no significant health hazard in Iraqi Flour.

EVALUASI KEBIJAKAN PROSES PEMBANGUNAN PLTN DI SEMENANJUNG MURIA KABUPATEN JEPARA JAWA TENGAH

The main problem that has become a phenomenon in this study is the evaluation of the policy of the process of building a nuclear power plant in the Semenanjung Muria, Jepara Regency, Central Java Province. This policy evaluation is designed to be able to describe the stages of the process, mechanism and objectives of development policy evaluation in the implementation of the construction of nuclear reactors in the Muria Peninsula. The national energy crisis facing the country of Indonesia can be overcome by the existence of alternative energy, namely nuclear power plants. The results of the evaluation conducted by BATAN stated the feasibility of building a nuclear power plant on the Semenanjung Muria, but this contradicts the opinions of the people who strongly reject the process of building a nuclear power plant in their region. This is then the researcher analyzes further and becomes the focus of discussion in this study. This study uses Dunn's policy evaluation theory as an analysis knife in analyzing the policy evaluation of the process of building a nuclear reactor on the Semenanjung Muria. The dimensions of the policy evaluation studied are effectiveness, efficiency, adequacy, leveling, responsiveness, and accuracy. This study uses qualitative methods, using primary data and secondary data. Primary data were obtained through in-depth interviews with related parties' perceptions about the policy. Secondary data collected in the form of a chronology of policies, laws and regulations and news about the research theme. The results of this study indicate that the evaluation of nuclear power plant development policies on the Semenanjung Muria has not been effective. This is due to public concern about the dangers of nuclear radiation that may be caused in the operation of nuclear reactors. In addition, problems related to political issues also have an impact on the discrepancy of the results of evaluations conducted by BATAN with the conditions that occur in the field. This continues with the era of reforms which has a direct impact on changing the direction of development and national nuclear policies.

A Spiral Resonators Passive Array for Inductive Wireless Power Transfer Applications With Low Exposure to Near Electric Field

In this article, we demonstrate the near electric field reduction ability of spiral resonators arrays (SRAs) in resonant inductive wireless power transfer (WPT) applications. In particular, we show that a suitably designed planar SRA, placed in the proximity of the driver loop, can significantly decrease the electric field level at the operative frequency, thus reducing the potentially dangerous radiation (i.e., the specific absorption rate) in the case of human exposure. In addition, due to the thin structure of the SRAs, the system is able to enhance the performance with respect to a conventional simple driver–receiver system for a fixed working distance. A systematic study has been performed through electromagnetic simulations to evaluate the optimum number of array unit cells to eventually achieve a compromise between efficiency enhancement and electric field shielding on a two-coil system, selected as a test case. Finally, the numerical results have been confirmed through measurements conducted on fabricated prototypes of the proposed WPT configurations. The introduced solution can be remarkably useful in all the WPT applications requiring a close interaction with human operators where exposure is a concern, such as automotive applications, biomedical implants, and rechargeable devices.

Photoprotection: Key Concepts, Current Status, and Special Patient Groups

This article aims to help non-dermatologist medical professionals regarding the current status of photoprotection so that they may be better positioned to advise and respond to their patients. While the effects of solar radiation have long been known to include sunburn and skin cancers derived from ultraviolet B radiation, advances in knowledge now recognise the relevance of ultraviolet A, visible, and infrared light as significant contributors to skin damage. Effects on the skin range from aesthetic signs of photoageing, which accumulate with daily exposure, to skin cancers. Despite some trends towards increased awareness of the dangers of solar radiation and the need for photoprotection, behaviours still put people at risk and sun protection is suboptimal. In addition to the general population, certain population groups require special consideration depending on their work environment, lifestyle, and health status. The efficacy and cosmetic properties of sunscreens have improved greatly and should help to improve compliance with recommended use, but a multifaceted approach focussed on education and enabling uptake of recommendations is essential.

Some Radiation Safety and Insurance Issues for Nuclear Spacecraft

Some issues concerning the prevention of dangerous radiation exposure of the general public and providing insurance for spacecraft with next-generation nuclear reactors are examined. It is shown that the technical and organizational measures to meet the requirements of international and Russian documents will secure radiation safety for the general public when using spacecraft with nuclear reactors, including during emergency situations. Insurance companies that insure rocket and space as well as nuclear technology can insure all risks of space activity associated with nuclear-powered spacecraft.

Is the Electromagnetic Radiation of Smartphones Really Safe?

The article is devoted to the analysis of the electromagnetic radiation impact on biological objects, primarily on humans. The research of domestic and foreign scientists on the electromagnetic radiation dangers to humans, especially the work of American scientists and the data of US government official reports of the US government is considered. Key words: smartphones, electromagnetic radiation, effects on human health

High-Energy Radiation in the Space

In spite of long periods of exploration, comprehension of the space radiation condition and the hazard it stances to long-length space explorers stays restricted. There is a dissimilarity between research results and watched experimental impacts found in human space explorer teams, likely because of the various elements that limit earthbound recreation of the perplexing space condition and extrapolation of human clinical outcomes from differed creature models. Given the expected fate of human spaceflight, with endeavors currently to quickly extend abilities for human missions to the moon and Mars, there is a squeezing need to enhance the comprehension of the space radiation chance, anticipate likely clinical results of interplanetary radiation presentation, and create suitable and compelling moderation methodologies for future missions. To accomplish this objective, the space radiation and aviation network must perceive the verifiable restrictions of radiation exploration and how such confinements could be tended to in future examination attempts. We have looked to feature the various elements that breaking point comprehension of the danger of room radiation for human teams and to recognize manners by which these impediments could be tended to for improved understanding and suitable hazard act in regards to future human spaceflight

Optimization Options for Integrated Radioecological Monitoring in the Arctic Zone of Russia During Operation of the “Akademik Lomonosov” floating Nuclear Power Plant. Proposals for Setting up Radioecological Monitoring in the Area of the Floating Nuclear Thermal Power Plant and Other Technogenically Dangerous Nuclear and Radiation Objects of the Category I and II

Optimization Options for Integrated Radioecological Monitoring in the Arctic Zone of Russia During Operation of the “Akademik Lomonosov” floating Nuclear Power Plant. Proposals for Setting up Radioecological Monitoring in the Area of the Floating Nuclear Thermal Power Plant and Other Technogenically Dangerous Nuclear and Radiation Objects of the Category I and II

BikeWay: A Multi-Sensory Fuzzy-Based Quality Metric for Bike Paths and Tracks in Urban Areas

Large cities are increasingly investing in efficient mobility and sustainable transportation as an alternative to expensive and pollutant traditional vehicles. In parallel, people are also seeking cleaner and healthier options for short and last-mile distances. In order to cope with this trend, which has boosted the adoption of bikes in urban areas, a major concern of the governments has been to build bike paths and tracks that allow cyclists to move safely and through shorter distances. However, such initiatives may result in bicycles infrastructure built alongside traditional vehicular roads or on inadequate regions. Therefore, there should be a flexible way to assess the quality of bike paths and tracks, combining variables that indicate adverse conditions for the health and safety of cyclists, such as statistical risk of accidents, air and noise pollution, excessive sunlight exposure, dangerous UV radiation, among others. This article then proposes a new comprehensive quality metric that combines sensed environmental data and historical reported incidents related to bike paths and tracks, which may be employed for traditional physical signaling or to support computer-assisted solutions for cycling monitoring and alerting. Such new metric exploits fuzzy logic to model a group of variables to ultimately provide a unified safety and health quality level, referred as BikeWay. Doing so, we expect to allow dynamic and historical perceptions of how healthy and safe the bike paths and tracks are for cyclists in modern cities.

Radioactive Rock Dumps in the Elkon Uranium Ore Area (South Yakutia)

We examine the geographical features in the distribution and the radiation parameters of radioactive rock dumps in the Elkon uranium ore area on the territory of South Yakutia. It is pointed out that the dumps under study are geomorphologically located on the Elkon horst which is a protrusion of crystalline basement rocks, towering over the territory of the Aldan highlands. It is found that most of these dumps lie within streambeds and in the bottoms of mountain rivers of the zone of hypergenesis and, geochemically, they are influenced by steep-slope topography, a cold humid climate and mountain-taiga vegetation dominating land cover. It is shown that these rock dumps were formed in the last third of the 20th century, during a large-scale and intense geological exploration for radioactive raw materials in this area. Radiation parameters of the dumps under study, such as the gamma radiation exposure dose, the content of 238U, 232Th and 40K, as well as the effective specific activity of these radionuclides were determined. It is found that the most active rock dumps, in their radiation parameters, approach radioactive ores. The dumps under study were ranked according to the degree of radiation danger to the population on the basis of the particular values of the gamma radiation exposure dose and effective specific activity of these radionuclides. It is established that the main source of radioactive contamination of soil and vegetation cover and the surface waters in the Elkon uranium ore area on the territory of South Yakutia are 40 rock dumps which are unevenly distributed in the total area of about 500 km2 of the mountain-taiga permafrost landscapes. It is determined that more than half of these dumps, in their radiation parameters, are classified as hazardous and specially hazardous.

Waste blast furnace slags as raw materials for the production of binders

Problem. Industrial waste accumulating in dumps, in many cases, have valuable technical properties, so they can be considered as secondary resources. Тhe study of the properties and modification of slags under various conditions requires an integrated approach, including different analysis. Goal . Based on the selected experimental methods to justify the resource value of Zaporizhstal waste blast furnace slag. Methodology . The methods of the study were X-ray diffraction, gamma-spectrometry, spectrographic analysis and electron-probe microanalysis. Results. X-ray phase analysis revealed the minerals of the blast-furnace slags in the crystalline state: rankinite 3CaO∙2SiO 2 , quartz SiO 2 , gehlenite 2CaO∙Al 2 O 3 ∙SiO 2 , bredigit α-2CaO∙SiO 2 , okermanit 2CaO∙MgO∙2SiO 2 , pseudowollastonite α-CaO∙SiO 2 . The mass fraction of the glassy component is calculated, which is half the mass of Zaporizhstal blast furnace slag. The elemental composition of the slag, determined by electron probe microanalysis, made it possible to characterize its fractions from the standpoint of toxicity. The elements potassium, sodium, sulfur, chlorine, copper and titanium, which are not included in the composition of minerals, were recorded using a scanning electron microscope, which gives grounds for assuming that they are sorbed by the surface of mineral particles. Micrographs of the surface of the particles of blast furnace slag indicate a high degree of loosening with the presence of needle-like and plate-like crystals, which determines the sorption properties of the slag. The maximum content of potassium, sodium and titanium is characteristic of the 2.5–5 mm fraction. Slag contains an insignificant amount (<1 %) of compounds of metals Fe, Ti and Cu belonging to the 3rd hazard class of substances, which does not interfere with the further disposal of slag. The III hazard class of waste slag blast furnace slag has been determined. Gamma-spectrometric method determined the specific radioactivity and the effective specific activity of slag fractions. Natural radionuclides 40 K, 226 Ra and 232 Th were detected. It is proved that slag and its separate fractions belong to the first class of radiation hazard and can be used in building industry without restriction. Originality . The minerals okermanit, bredigit, pseudovollastonite are technically valuable in the production of binding materials, since they have hydraulic activity. The presence of amorphous phases indicates increased sorption and chemical activity of slag, which is important from the standpoint of the use of slag in the production of binders. In the large slag fraction, the mass contribution of the amorphous state of the substance is slightly higher. Practical value. Zaporizhstal waste blast furnace slag can be recommended in the production of binders – Portland cement and slag Portland cement, according to a combination of chemical indicators: a high concentration of hydraulically active minerals and amorphous phase, highly developed surface of slag particles, the presence of sorption surface activity, attitude to moderately hazardous production waste and class I radiation danger.

The anatomy of fear: interplay between metaphor, metonymy and image schema in the conceptualization of fear/strach in English and Polish

The total medical-biological impact of the Earth's space radiation environment on humans is a function of combined EVA and non-EVA exposure. In either case, the correct assessment of the eventual health risk to crew members is crucial to the success and viability of a project or mission. Aside from the medical-biological aspect itself, the validity of any assessment depends entirely on the existence of good and reliable models providing the high quality data that is needed for such evaluations, which should contain time histories of storm and substorm events, their intensities, their frequency of occurence, and their duration. Prediction requirements, advantageous and desirable model developments and improvements, and systems that need to be designed and tested, which would alert space crews and maintenance personnel about impending radiation danger are outlined.

Advanced methods of low cost mission design for the Galilean moons exploration

The implementation of the deep space expeditions to the outer Solar system is the one of main priorities of modern astrodynamics. One of the irritating factors for this is the probability of the life determination in the underground ocean at the Jovian icy moon Europa. In that regard the realization of the cosmic projects using the spacecraft — orbiters around the Jovian Galilean Moons and especially the descent modules implementation on their surface is one of the basic focuses of the current international cosmic space researches collaboration. The mission design of such cosmic projects must be executed using new advanced methods for their planning: Low Energy Tours exploring, Favourable Total Radiation Doze of the spacecraft (SC) provision, and tolerable maintenance of the SC’s Time of Flight during the Jupiter system phase. Furthermore, the saving character of the trajectory design for the artificial satellite of the Galilean moon necessary required the smallness of the SC’s velocity relative this moon, i.e. the smallness of the SC’s hyperbolic velocity excess vector. In this work multibody bunch adaptive synthesis algorithms to overcome ballistic determinism expressed by existing of the integral of Jacobi in the basic CR3BP (circular restricted three body problem) are developed. It is shown that the diversity of the gravity of the ensemble in the Jovian system, not only complicates the accurate ballistic mission analysis, but, when its multibody effective use, allowing you to tailor flowed algorithms for the constructing scenarios of gravity assist maneuvers for interplanetary missions design, including circumvention of dangerous radiation areas, as well as landing at selected Galilean moon at a reasonable cost, resources and time.

The accuracy of ultrasound in the diagnosis of breast diseases

The study was intended to evaluate the role of ultrasound as diagnostic technique in the diagnosis of breast diseases, comparing it to the conventional and widely used technique i.e mammography,FNAC and histopathology.&#x0D; THE breast diseases were divided according to their clinical and ultrasound criteria into simple cyst(10), galactocele(3), fibro adenoma (64), carcinoma (36), duct ectasia (6), abscess (3), mammary dysplasia (25) , and undetermined cases (3).&#x0D; All those patients were subjected for pathological confirmation by needle aspiration cytology in (80) and/or excisional biopsy in 110 patients.Twelve patients refuse FNAC (18%). The age of the patients ranged from 15-80 years with a mean of 40 years .One hundred and fourteen(76), patients had benign lesions and 36 cases of them (24%) had malignant lesions. For cystic lesions like simple cyst, abscesses , and cystic changes of mammary dysplasia , the study shows 100% sensitivity , specificity and accuracy. For FNAC , the sensitivity , specificity, and accuracy were 91% 92% respectively. For carcinoma of the breast , thee sensitivity , specificity and accuracy were 86.7% , 91%. And 90% respectively ,which is less because of some overlap of the ultrasonic criteria of benign and malignant lesions.The sensitivity ,specificity and accuracy of ultrasound is high, especially in benign lesions . therefore ultrasound is an accurate , safe , and non-invasive technique for diagnosis of breast diseases in addition to be without danger of radiation, especially for young patients less than 35 years of age.

Conflictual collaboration:

ABSTRACTIn the aftermath of the 2011 Fukushima nuclear disaster, citizen scientists collectively tracked and monitored residual radioactivity in Japan, legitimizing alternative views to an official assessment of the radioactive contamination. But initial practices of resistance have evolved in collaboration with the official Japanese politics of radioactive governance, supporting hegemonic understandings of radiation danger and normative visions of postdisaster recovery. Civic resources used to resist and reinterpret official narratives of contamination end up reinforcing a state‐sponsored normalization of this disaster. Meanwhile, they become crucial techniques of neoliberal governmentality designed to govern the conduct of populations amid contaminated environments. [nuclear disaster, radioactive contamination, citizen science, governance, neoliberalism, Fukushima, Japan]

Recent Status of Public Response to RDE Development & Utilization

Preliminary study on social aspect of Experimental Power Reactor (RDE) development and utilization has been conducted, focusing on the qualitative aspects of public response and developing social issues related to the planning of RDE development at South Tangerang region. The study involves assessment on focused-group discussions results, public inputs given via distributed questionnaires and interviews with relevant stakeholders at focus areas. The study is aimed to identify specific issues and opinions growing in the public prior to the launching of Government plan in building RDE at Puspiptek Complex and to identify important stakeholder groups which need to engaged during the continuation of RDE program, as part of sustainable social engineering program to increase public acceptance on RDE project and nuclear energy. Desk study, interviews and qualitative analysis were utilized as methodology of this study. The study reveals several important issues growing among the public, they are, public fear on environmental impact if accident occurs, public stigma on radiation danger, low understanding on environmental monitoring activities which leads to less confidence on environmental protection and economic benefits provided by the new reactor occurrence. The study also reveals three major importnt stakeholder groups which need to be engaged during the social engineering program implementation, they are general public living at 3 regions around Puspiptek Complex, workers at Puspiptek Complex and academic community. These results will be beneficial to the development of social engineering program and implementation of public engagement for RDE project.

ANTI RADIATION BUILDING DESIGN: LOCAL SAND TYPE ANALYSIS TO GET CONCRETE X-RADIATION RESISTANT X-RAY

Background : There are three ways to protect yourself from the danger of radiation, namely by regulating the length of irradiation (the effect of time), the use of anti-radiation material (shielding), and adjusting the distance from the radiation source (distance). In order to be safe in carrying out x-ray irradiation, patients and operators must take three steps so that radiation hazards can be minimized (Nunung, 2004). One way to check the danger of external radiation is to use a radiation barrier. This method is generally preferred, because it creates safe working conditions. Besides that the time and distance factors can be monitored continuously at the time of work, so that radiation workers can be guaranteed safety. Methods: This research is quantitative research with an experimental approach. The method of data collection in this study is observation, direct experiments and documentation. The types of sand to be used in this study are south beach sand, opaque sand, progo sand, white mountain sand and volcanic sand. Result : Concrete using sand material from South Beach has the lowest HVL value of 0.8644cm. Conclusion : The HVL value possessed by concrete with South Beach sand material is most effective in resisting x-ray radiation.

Determination of the flux of a neutron radioisotope source through gold activation method

Introduction: In recent years, the use of neutrons has increased in various fields such as medicine and industry. One of the important applications of neutrons is in medical research. Neutrons have greater linear energy transfer than gamma rays and are considered more dangerous radiation. Hence, the detection and determination of neutron dose is a very important and vital issue. For determination of neutron dose, measurement of its intensity or flux is essential. One of the ways of neutron flux determination is using of gold foil activation method. In this method, the activity of the irradiated foil is proportional to the neutron flux. The gold foil is activated by reaction 197Au (n,γ) 198Au because of the thermal neutron capture,. In the decay of activated gold, a gamma radiation of 411.8 keV is released with a probability of more than 95%, that By measuring the area below the peak associated with this energy, by the NaI(Tl) detector, the activity of gold and then the neutron flux is determined. Materials and Methods: In this paper, an 18 carat gold foil was used to measure the flux of a neutron radioisotope source Ra-Be in the nuclear laboratory of the Faculty of Science of Guilan University. Results: After irradiation, the gold foil was counted by NaI(Tl) detector and its flux was determined Conclusion: Finally, by comparing the measured flux and the flux in the Ra-Be neutron source catalogue, it is resulted that the mentioned method has a good accuracy in determination of the flux of the neutron source.