Radiation In Radiofrequency Range Research Articles

Stratification of Risk Factors for the Development and Progression of Multi-Organ Pathology in Individuals Professionally Associated with Electromagnetic Radiation of Radio Frequency Range

Stratification of Risk Factors for the Development and Progression of Multi-Organ Pathology in Individuals Professionally Associated with Electromagnetic Radiation of Radio Frequency Range

Mathematical model for temperature estimation forecasting of electrically conductive plate elements under action of pulsed electromagnetic radiation of radio-frequency range

A mathematical model for determining the temperature of an electrically conductive plate element under the action of pulsed electromagnetic radiation of the radio-frequency range is proposed. This model allows us to take into account the influence of the process of thermoelastic energy dissipation on the forecasting of the value of temperature in addition to the joule heat. This process is determined by thermal expansion and the action of poendromotive forces arising in the element. This approach allows us to predict a decrease in the error of temperature determination. On this basis, the distributions of temperature in an electrically conductive plate element under the action of an amplitude-modulated radio pulse have been investigated numerically. Thermoelastic energy dissipation is taken into account when using the frequencies of the carrying electromagnetic oscillations beyond the resonant frequencies and of the first resonant frequency of the electromagnetic field for this element. An estimate of the influence of the process of taking into account mechanisms of energy dissipation on the total value of temperature in the element at the specified action and used frequencies is obtained. This has allowed us to increase the accuracy of temperature measurements in this element.

EPIDEMIOLOGICAL SURVEY ON EFFECT OF EMF EMITTED BY PHOTOCOPY MACHINES GENERALLY USED IN DHAKA CITY BANGLADESH

Significant concerns has been raised about possible health effects from exposure to radiofrequency (RF) electromagnetic fields specially after the rapid introduction of modern amnesties specially the mobile telecommunication systems. The biological effects of low level EMF and a possible potential relation various diseases specially blood cancer causation are controversial. There are many epidemiological studies of the possible adverse health effects associated with environmental exposure to extremely low frequency (0-300 Hz) non-ionizing radiation such as that emitted by power cables and electrical substations linking such exposure to leukemia, brain cancer, male breast cancer, skin cancer and eye melanoma. Far less attention has been paid to health hazards from environmental exposure to radiation in RF range (100 kHz-300GHz) at field strengths much below to these required to produce thermal effects. Laboratory studies in this area have also been confusing and conflicting. While some animal studies suggest that RF fields accelerate the development of cancers, other studies found no carcinogenic effect. Obviously, there is an urgent need for extensive, well conducted epidemiological and laboratory studies. Photocopy machines are being used all over the world as it has made the life easy for academic, office, business. Hundreds of photocopy machines are also being used in Bangladesh. EMF is also emitted by photocopy machines. There has been no such study performed in Bangladesh. The data were collected from various places in Dhaka city, Bangladesh: Banani Super Market, Mohakhali, Farmgate Green Road, Nilkhet and Uttara. Both Electric and Magnetic fields were measured for photocopy machines. Both epidemiological survey and EMF measurements were done for these locations. These results showed that in many cases the magnetic field radiated from the different sources are greater than the threshold limit and photocopier operators suffered from various types of ailments like indigestion, vomit, insomnia, pain in hands and legs, stomach ache, mental depression, skin disease, cataract, sexual problems, hairs turning white etc. due to prolonged exposure to EMF. In many of the photocopier shops the operators were working in congested space with lots of machineries around. There are many devices and power lines around them, having a congested environment and low circulation of air. Also smoking contributed to their overall health problems.

Looking at the other side of the coin: the search for possible biopositive cognitive effects of the exposure to 900MHz GSM mobile phone radiofrequency radiation.

Although exposure to electromagnetic radiation in radiofrequency range has caused a great deal of concern globally, radiofrequency radiation has many critical applications in both telecommunication and non-communication fields. The induction of adaptive response phenomena by exposure to radiofrequency radiation as either increased resistance to a subsequent dose of ionizing radiation or resistance to a bacterial infection has been reported recently. Interestingly, the potential beneficial effects of mobile phone radiofrequency radiation are not only limited to the induction of adaptive phenomena. It has previously been indicated that the visual reaction time of university students significantly decreased after a 10 min exposure to radiofrequency radiation emitted by a mobile phone. Furthermore, it has been revealed that occupational exposures to radar radiations decreased the reaction time in radar workers. Based on these findings, it can be hypothesized that in special circumstances, these exposures might lead to a better response of humans to different hazards. Other investigators have also provided evidence that confirms the induction of RF-induced cognitive benefits. Furthermore, some recent reports have indicated that RF radiation may play a role in protecting against cognitive impairment in Alzheimer’s disease. In this light, a challenging issue will arise if there are other RF-induced stimulating effects. It is also challenging to explore the potential applications of these effects. Further research may shed light on dark areas of the health effects of short and long-term human exposure to radiofrequency radiation.