Radon Risk Research Articles

Radon and lung cancer risk.

Radon and lung cancer risk.

Raising awareness through continuous indoor radon measurements in workplaces.

When radon is taken out of the scientific context in order to be understood by the public, the way the media approaches radon is prone to sensationalising. Communicating risk in a clear and effective manner was never easy and communication of radon risk poses serious challenges because radon is not widely known and specialists need to be more involved in engagement activities and campaigns to inform about radon exposure. This paper presents the results of the continuous radon measurements performed in workplaces for raising awareness among occupationally exposed workers. Radon measurements were made using Airthings monitors for up to 9months of monitoring. Measured data correlated to real-time visualisation of the maximum radon levels provided convincing evidence that led to increased interest for radon exposure among exposed workers, raise awareness and empowered their own understanding of radon exposure.

Fuzzy radon hazard index assessment for stochastic environmental health risk evaluation of urban scale building

Radon gas emission is emerging phenomenon that poses potential danger to human health as a result of modern lifestyles. Thus, it is critical to conduct stochastic evaluations of the amount of this hazardous gas in urban areas and residential buildings to identify environmental health risks. To assess statistical radon environmental health risks, this research proposes two novel fuzzy radon hazard indices (FRHIs), FRHI1 and FRHI2.. FRHI1 can contribute to every standard, while FRHI2 can be compared to geogenic radon potential or geogenic radon hazard indices. The output indices FRHIs range from 0 (no hazard) to 100 (the highest degree of hazard). The proposed approach can serve as a circumstantially integrated standard for stochastic radon risk assessment and management, so that fuzzification can bring innovation in stochastic standards in this field. In this study, radon concentration was measured in an urban building and natural radon and emission zoning maps were created using ArcGIS software at urban and geological scales. A residential building unit located in a critical area was selected and some corrective actions were adopted to reduce radon in urban building units. The FRHI Assessment for stochastic environmental health risk evaluation showed that the initial fuzzy level for the mean value of FRHI is hazardous (for an FRHI value equal to 60.1), indicated by red. However, the Maximum FRHI level for 48 h after the installation was rather hazardous (for an FRHI value equal to 44.8), indicated by orange. After steady-state installation, the maximum statistical environmental health risk would fall into an improved category. Identifying critical areas can provide exceptional control at the urban scale building that reduces the risks of natural radon.

Multiparametric analysis for the determination of radon potential areas in buildings on different soils of volcanic origin

The transposition of the European EURATOM directive into the regulations of the different member states of the European Union involved governments making great efforts to define priority action maps against indoor radon exposure in buildings over a short time period. In Spain, the Technical Building Code established 300 Bq/m3 as a reference level and set up a classification of municipalities in which remediation measures should be adopted for radon exposure in buildings. Oceanic volcanic islands, such as the Canary Islands, present high geological heterogeneity in a small space due to their volcanic origin. This variability poses a challenge to the elaboration of radiological risk maps, which makes it necessary to have a high density of data to collect local variations. This paper presents a methodology to obtain accurate radon risk maps based on geological criteria and terrestrial gamma radiation. The predictive efficiency of these maps is statistically verified using indoor radon concentration data measured in buildings. Other radiological variables, which are commonly used as criteria for radon risk prediction found in the literature, were also applied, such as the geogenic radon potential and the activity concentration of natural radioisotopes in soils. The higher resolution of the maps obtained allows for a more detailed classification of radon risk zones in the study area than the current risk maps published in the Spanish building regulations.

Influence of Dose Conversions, Equilibrium Factors, and Unattached Fractions on Radon Risk Assessment in Operating and Show Underground Mines.

This paper compares the results of measurements taken in the underground workings of active and tourist mines. In these facilities, the aerosol size distributions of ambient aerosols at key workplaces and the distributions of radioactive aerosols containing radon decay products were determined. Based on these studies, dose conversions used for dose assessment and unattached fractions were determined. In addition, radon activity concentrations and potential alpha energy concentrations of short-lived progeny were also measured in the mines to determine the equilibrium factor. The dose conversions varied between 2-7 mSv/(mJ × h × m-3). The unattached fraction measured in active coal mines ranged from 0.01-0.23, in tourist mines from 0.09-0.44, and in the tourist cave it was 0.43. The results showed significant discrepancies between the effective doses determined from current recommendations and legal regulations and those determined from direct measurements of parameters affecting exposure.

Levels of Radon in Soils of Dodoma City, Central Tanzania

Purpose: Humans receive radiation doses exceeding fifty percent (50%) of the total dose from natural sources as a result of inhaling radon and thoron gases and their daughters. Radon occurs naturally in soils and can diffuse into indoor environments leading to adverse health effects for inhabitants. In this study, measurement of levels of radon gas in soils was performed with the purpose of categorizing areas and highlighting the likelihood of high levels of radon in indoor environments.
 Design/Methodology/ Approach: The study targeted the environs of Dodoma where the rapid expansion of human settlements is ongoing or anticipated. For easy access and convenience, the study was conducted in areas located along main roads leading to the nearby towns/cities. Sampling was done by inserting the drilling rod to a depth of approximately one meter (1 m) below ground level with the aid of a heavy hammer. The alpha pump was used to suck the soil gas from the ground through a metallic tube (the capillary probe) and pressed it into the ionization chamber of the measuring instrument (AlphaGUARD). Radon concentration was read directly from the instrument’s display.
 Findings: It was found that radon concentrations in soil vary from 18.8 to 233.5 kBq.m-3. Based on the radon risk criterion, surveyed areas range from normal to high radon risk categories.
 Research Limitation/Implication: The study only covered a limited area in Dodoma City, and therefore the results may not be representative of the entire city or even the surrounding regions.
 Practical Implications: This study is useful in categorizing building areas based on radon risk criterion with the purpose of reducing possibilities of radon-related health risks; mainly lung cancer to the population.
 Social Implications: Radon is a proven cause of lung cancer in humans. Therefore, knowledge of radon levels in the study area will help in setting the mitigation measures necessary for public health protection.
 Originality / Value/ Novelty: The study demonstrates an approach for estimating radon levels in soils which is beneficial to current and future researchers, environmentalists and regulators, among others.

Bulgarian public opinion survey for risk perception including radon and suggestions for communication

The paper reviews and analyses the results of STEAM survey of the Bulgarian population. A Survey and the preparation of a questionnaire were initiated within the framework of the IAEA Project RER9153 “Enhancing the Regional Capacity to Control Long-Term Risks to the Public due to radon in Dwellings and Workplaces”. The survey includes 1003 respondents from the Bulgarian adult population 18+. The main conclusions are:The health of the Bulgarian people is mostly assessed as satisfactory (38.7%) and all respondent considers a person's health better than the people's health as a whole. The main risk factors that can affect the health of Bulgarians are: Stress; Unhealthy nutrition; Smoking; Polluted air/dust; Health system - difficult access, improper treatment; Economic situation - low income; Alcohol; Lack of physical activity. Risks such as Environment; Working place and Lifestyle (harmful habits) are below 10%. The general awareness of radon and associated risks with it is very low among the Bulgarian adult population: 78% know nothing or very little about the health risks of radon. Almost half of the population doesn't know if home radon testing is a priority for them. About 30% of Bulgarians think that there is no point in testing the home they live in since they always maintain good ventilation. The population does not recognize the National Radiation Protection and Public Health Authorities as a trusted source of health risk information. The internet and social media are the main sources of information regarding health risks. The most important result that should be taken into account when building a new communication strategy is the fact that nearly 40% of the respondents declare that they are informed about health risks by general practitioners (GP), and the trust in them is over 50%.

Long-term vs. short-term measurements in indoor Rn concentration monitoring: Establishing a procedure for assessing exposure potential (RnEP)

Radon (Rn-222 or Rn) is a naturally occurring chemical element that belongs to the progeny of U-238 released from soil and rocks into the atmosphere, whose impact on organisms is not negligible when it occurs inside confined spaces, such as mine shafts or low-ventilated buildings. The current methodologies for indoor radon assessment are based on passive and active detection. If passive detectors are mainly designed for long-term assessment, active detectors are electronic equipment that can allow on-time visualization of results and, therefore, faster decision-making on risk mitigation measures implementation. However, despite offering a prompt and informed decision, the uncertainty associated with active detector results may cast doubt on the quality of the measurements, which especially arises from the duration of the monitoring campaign. Since radon emanation from soils and rocks depends on a set of variables related to meteorological parameters and soil structure, the seasonal variation of these parameters impacts indoor radon concentration assessment, both on short-term and long-term measurements. Therefore, short-term monitoring campaigns lasting a month, a week, or a day may not produce a statistically representative description of indoor radon exposure for the monitored building. Accordingly, the study compares the reliability of short-term and long-term indoor radon measurements. It proposes a procedure for assessing the indoor Radon Exposure Potential (RnEP) based on in situ measurements through the analysis of the frequency of occurrence of results divided into three classes of potential exposure (low, moderate and high) to reduce occupants' radon risk exposure.

Is targeting the solution? Evidence from an experiment on radon risk communication

While prolonged exposure to radon is one of the most significant risk factors for lung cancer, public awareness and willingness to mitigate the risk are typically low, even in regions with high radon concentrations. Given this, it has been voiced that health protection agencies should follow a more targeted risk communication approach (Perko & Turcanu, 2020). While targeted and tailored risk communication approaches have been shown to be successful, especially regarding so-called lifestyle risks (smoking, unhealthy diet, etc.), the effects of targeted radon risk communication from a health protection agency perspective have not been analyzed thus far. To this end, we conducted an online experiment. Four web pages were created targeting four stakeholder groups: (1) tenants and (2) house owners in municipalities with high radon concentrations, (3) tenants and (4) house owners in areas adjacent to municipalities with high radon concentrations. The content of the web pages was designed based on the German Federal Office for Radiation Protection’s (BfS) materials. Participants (n = 293 valid cases) were randomly assigned either to the experimental or control group. We assessed differences between the stakeholder groups regarding information comprehension, risk perception, behavioral intention, perceived efficacy of measures against radon, and (personal) uncertainty regarding radon. In a MANOVA including all five dependent variables, the null hypothesis that there are no differences regarding these variables between the stakeholder groups could not be rejected (Wilk’s Λ = 0.9980, p = .99). Given an achieved statistical power of 1-β = .93 for effects of medium size according to Cohen, it is quite unlikely that medium or large effects can be achieved by targeting risk communication to the stakeholder groups described above, given our data. As the statistical power to detect small effects was low (1-β = .21), these cannot be precluded. Potential reasons for this finding and implications for risk communication practice are discussed.

Parametrization identification and characterization of the radon priority areas for indoor radon risk management

The aim of work is to contribute to the development of methodologies concerning the selection and characterisation of radon priority areas. The selection of areas was based on risk from indoor radon exposure, expressed in terms of number of expected deaths per year. Radon data come from a survey carried out in the Lazio Region (Italy) and consist of 5297 indoor concentration measurements. Population data were also used. Data showed that dwellings with concentrations above 300 Bq/m3, taken as reference level (RL), are not confined to specific areas, but rather spread out over the territory. An absolute risk model has been chosen to predict annual deaths on a regular grid of cells 2kmx2km sized. The analysis showed that 21.7% of the territory is completely uninhabited and that another 13.9% presents a marginal risk, quantifiable in total as less than one expected death per year. The remaining territory is of interest to identify the areas where dwellings with a concentration higher than the RL would be located. It was found that: such dwellings occur with different percentage in all the cells; exposed people varies from a few to almost 2000 per cell; indoor radon risk from exposure above RL is dominated by the number of exposed people and amounts to 106 deaths per year; the number of cells where a such risk is low is far greater than where the risk is high. These findings led to restrict RPA to the smallest set of cells that retained 85% of risk, i.e. 90 expected deaths per year. This percentage has been subjectively set because the technical and economic information required for its optimal calculation was not available. Based on this assumption, the RPA were identified by applying a threshold of 43 to the number of exposed people in each cell, in order to reach 85% of risk. The other main characteristics, also expressed as percentages of the corresponding totals within the area of interest, were found to be: extension 31.5% and exposed people 84%.

Radon Risk Assessment and Dose Rates in Hekimhan and Kuluncak (Malatya, Turkey) Soil Samples

Radon Risk Assessment and Dose Rates in Hekimhan and Kuluncak (Malatya, Turkey) Soil Samples

Clearing the air: A systematic review of mass media campaigns to increase indoor radon testing and remediation

Abstract Indoor radon is a natural radioactive gas that enters homes through cracks in the foundations. It is one of the leading causes of lung cancer. Although radon can be detected with an indoor radon test and can be mitigated by means of either ventilation or professional measures, testing and mitigating rates of the at-risk population remain insufficient. The objective of this study is to systematically review the current level of evidence regarding the design and effectiveness of mass media campaigns to address the health risks of indoor radon to homeowners. The results show that informative tone of voices prevailed, other components, such as emotional or social components, were often not included. Furthermore, the focus was mostly on intention and less on behavior itself, and on testing instead of mitigation. Further research is needed to test effective and innovative communication strategies to increase protective behavior concerning indoor radon.

Age-dependent potential health risk assessment due to radioactive radon-222 in the environs of highly populated Durgapur industrial zone and nearby Bakreswar hot spring, India.

It is well known that exposure to a high concentration of radon-222 causes severe health effects, including cancer. The present article includes a survey on radon-222 in the water bodies of the city Durgapur [non-geothermal area] and nearby Bakreswar hot spring [geothermal province], India. The possible sources of radon from natural radionuclides and industries have been discussed in the article. Durgapur is a densely populated [~ 3680 persons/km2] industrial city with a population of 0.57 million. On the other hand, many tourists and pilgrims usually visit Bakreswar throughout the year. Age-dependent potential health risk assessments of the dwellers at Durgapur and Bakreswar due to radon exposure were performed for the first time. The present work is the first attempt to estimate the mean ingestion /and inhalation dose per annum, total effective dose [TED] per annum and the health risk assessment for cancer in adults, children and infants due to radon exposure at Durgapur and Bakreswar. In some cases, the values of TED exceed the permissible limit of 100 micro Sievert per year [µSv/y] as recommended by EUC and WHO. The radiation profile maps relating to radon concentration and associated contour maps of health risk factors [HRF] for the adults, children and infants were also prepared for the first time. Some areas were identified as high-risk zones, and the dwellers are prone to a high risk of cancer. The article also proposed several techniques to reduce radon in water and buildings. The authors also recommended banning some water sources to protect people from radon risk. This study will help scientists, policymakers, industrialists, farmers, government agencies and public health departments.

From Radon and Thoron Measurements, Inhalation Dose Assessment to National Regulation and Radon Action Plan in Cameroon

Background: The current study reports measurements of activity concentrations of radon (<sup>222</sup>Rn) and thoron (<sup>220</sup>Rn) in dwellings, followed by inhalation dose assessment of the public, and then by the development of regulation and the national radon action plan (NRAP) in Cameroon.Materials and Methods: Radon, thoron, and thoron progeny measurements were carried out from 2014 to 2017 using radon-thoron discriminative detectors (commercially RADUET) in 450 dwellings and thoron progeny monitors in 350 dwellings. From 2019 to 2020, radon track detectors (commercially RADTRAK) were deployed in 1,400 dwellings. It was found that activity concentrations of radon range in 1,850 houses from 10 to 2,620 Bq/m<sup>3</sup> with a geometric mean of 76 Bq/m<sup>3</sup>.Results and Discussion: Activity concentrations of thoron range from 20 to 700 Bq/m<sup>3</sup> with a geometric mean of 107 Bq/m<sup>3</sup>. Thoron equilibrium factor ranges from 0.01 to 0.6, with an arithmetic mean of 0.09 that is higher than the default value of 0.02 given by UNSCEAR. On average, 49%, 9%, and 2% of all surveyed houses have radon concentrations above 100, 200, and 300 Bq/m<sup>3</sup>, respectively. The average contribution of thoron to the inhalation dose due to radon and thoron exposure is about 40%. Thus, thoron cannot be neglected in dose assessment to avoid biased results in radio-epidemiological studies. Only radon was considered in the drafted regulation and in the NRAP adopted in October 2020. Reference levels of 300 Bq/m<sup>3</sup> and 1,000 Bq/m<sup>3</sup> were recommended for dwellings and workplaces.Conclusion: Priority actions for the coming years include the following: radon risk mapping, promotion of a protection policy against radon in buildings, integration of the radon prevention and mitigation into the training of construction specialists, mitigation of dwellings and workplaces with high radon levels, increased public awareness of the health risks associated with radon, and development of programs on the scientific and technical aspects.

Radon exposure and risk of neurodegenerative diseases among male miners in Ontario, Canada: A cohort study.

Environmental radon has been examined as a risk factor for neurodegenerative diseases in a small number of previous studies, but the findings have been inconsistent. This study aims to investigate the association between occupational radon exposure and neurodegenerative disease in a cohort of male miners with work experience in multiple ore types in Ontario, Canada. Radon exposure (1915-1988) was assessed using two job-exposure matrices (JEM) constructed from using historical records for 34,536 Ontario male miners. Neurodegenerative outcomes were ascertained between 1992 and 2018. Poisson regression models were used to estimate incidence rate ratios (RR) and 95% confidence intervals (CI) between cumulative radon exposure in working level months (WLM) and each neurodegenerative outcome. Levels of cumulative radon exposure showed variability among cohort members with a mean of 7.5 WLM (standard deviation 24.4). Miners in uranium mines or underground jobs had higher levels and more variability in exposure than workers in non-uranium work or surface jobs. Compared to the reference group (radon < 1 WLM), increased rates of Alzheimer's (RR 1.23, 95% CI 1.05-1.45) and Parkinson's disease (RR 1.43, 95% CI 1.08-1.89) were observed among workers with >1-5 WLM and >5-10 WLM, respectively, but not among higher exposed workers (>10 WLM). This study did not observe a positive monotonic dose-response relationship between cumulative radon exposure and Alzheimer's or Parkinson's disease in Ontario mining workers. There was no association observed with motor neuron disease.

Impact of the loess’ hydraulic characteristics on its degree of saturation for the purpose of radon index measurements (Northeast Bulgaria case study)

Radon gas has high mobility and is driven by advection and diffusion with the soil gas throughout connected and water-unsaturated pores and/or cracks in permeable rocks and soils. Therefore, there is a need for quantitative assessment of the saturation state, even on a daily-base in order to estimate the radon potential correctly. The more so as, the permeability is one of the key factors in the radon risk assessment. For the purpose of such investigation, a vertical profile model was elaborated for a study site in Northeast Bulgaria. On the base of pedotransfer function analyses, the hydraulic parameters describing the retention function and the hydraulic conductivity function were determined for each case study. The results show that even in a month with high amount of rainfall precipitation (13% of the total amount per year), the loess profile at certain depths remains unsaturated, regardless the difference in the hydraulic characteristics.

Correction: Mancini et al. A Novel Strategy for the Assessment of Radon Risk Based on Indicators. Int. J. Environ. Res. Public Health 2021, 18, 8089

In the original publication [...].

Application of the ALARA principle for radon at work: feedback from the European ALARA network

The Council Directive 2013/59/Euratom has introduced binding requirements for the management of radon in the workplace in Member States of the European Union. How does it work in practice? In 2021, the European ALARA Network created a working group on ALARA for Radon at Work with the objective of collecting and sharing experiences from the field. A survey was developed to detail each step of the national regulations for the control of radon and to describe case studies showing implementation. This article presents a qualitative analysis of the answers received from seven countries. There are no two similar national regulations and, at each step, different provisions, protocols, techniques etc are applicable or recommended. This diversity contributes to the richness of the results and can inform about interesting and good practices, where ‘good’ is defined by what is appropriate in the nationally and locally prevailing circumstances. All national regulations follow a graded approach, which is a key component for the implementation of the optimisation (ALARA) principle, yet several potential weak points that may be challenging to ALARA have been identified and are discussed, namely the radon risk assessment, the focus on numerical values, uncertainties in the measurement, how to obtain economically efficient remediation, and the interface with other regulations. Strengthening collaboration between risk prevention and radiation protection actors could help to provide and build expertise on radon management in the workplace, especially when exposure is managed as a planned exposure situation.

Effect of Radon and Lung Cancer Risk: A Narrative Literature Review

Exposure to cigarette smoke has been known to be a major risk factor for lung cancer. Although smoking has long been considered the main cause of lung cancer, about 5 to 25% of lung cancer cases occur in non-smokers. Radon is said to be the second most important cause of lung cancer after smoking. Radon-222 is a chemical element in the form of a highly radioactive gas that comes from the decay of the parent radioactive element, uranium, which is found in the earth's crust. Inhaled radon gas can adhere to the mucosal lining of the airways and damage the airway epithelium. The process of ionizing radiation by alpha particles due to the decay of radioactive substances can cause mutations and chromosomal aberrations, severance of DNA double chains, and formation of reactive oxygen species. (ROS) that cause cell cycle changes, up-and down-regulation of cytokines, and increased production of proteins associated with cell cycle regulation and carcinogenesis. Research on radon and lung cancer has not been widely conducted in Indonesia. This literature review aims to describe radon and its effects on lung health.

반도체 센서를 이용한 라돈측정기의 구현

Radon is a naturally occurring radioactive gas. It is colorless, odorless and tasteless and can only be measured using special equipment. Because it is a gas, radon can move freely through the soil enabling it to enter the atmosphere. When radon surfaces in the open air, it is quickly diluted to harmless concentrations, but when it enters an enclosed space, such as a house, it can sometimes accumulate to unacceptably high concentrations. So, measurements of indoor radon are very important for escaping from radon risks. Until now, to measure the indoor radon concentration, imported radon sensors are needed. So, DB construction of indoor radon emission and popular radon measuring apparatus should be developed. In this paper, we propose the radon detecting method using PIN photodiode and CMOS image sensors. Also, we confirmed the PIN photodiode and CMOS image sensors could be used as radon sensor module through some experimental studies.