Radiation literature survey

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This is a measurement study which investigated the radiofrequency (RF) exposure of workers in the telecommunications industry. A total of seven sites that hosted either broadcasting transmitters or mobile phone transmitters or both were measured for the RF levels in the study. The study found that the riggers working in radio and TV broadcast companies experienced the highest RF exposure and for the longest duration compared to workers for mobile phone operators.

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This is an animal study which investigated whether extremely low frequency (ELF) magnetic fields (MF) affect the cardiovascular system. A total of 128 rats were divided into two groups: (i) exposed (at a frequency of 50 Hertz, Hz and at a magnetic flux density of 100 microtesla, µT) for 20 hours per day, for 24 weeks; (ii) sham-exposed. Examinations on blood pressure, pulse rate, heart rate, and structure of the heart of the exposed group did not reveal any differences to the sham-exposed group. The authors concluded that the ELF MF exposure has no effect on the cardiovascular system.

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This meta-analysis looked into the studies on RF exposure and working memory. A total of 10 studies met the inclusion criteria which are largely based on blinded human provocation studies. It found no differences between the exposed group and sham-exposed group, in any of the three working memory tasks investigated. The authors found that RF exposure has no effects on working memory.

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This animal study investigated the effects of RF exposure on core body temperature. Rats were either exposed to RF at a frequency of 2.14 gigahertz (GHz) or sham-exposed. A group of 4 rats was each exposed in one of these four exposure conditions: (i) single 6-hour exposure at specific absorption rate (SAR) of 4 watts per kilogram (W/kg); (ii) three 3-hour exposures at 4 W/kg; (iii) three 6-hour exposures at 0.4 W/kg; or (iv) three 6-hour exposures at 4 W/kg. The authors found that the core body temperature was increased by 1.5°C in those exposed to 4 W/kg (50 times the SAR limit for public exposure stipulated in the Australian RF Standard) while there was no change in core body temperature for those exposed to 0.4 W/kg (5 times SAR limit for public exposure).

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This review looked into the studies on electromagnetic fields (EMF) performed in the last 25 years by a group of researchers based in Australia’s Swinburne University. The work of the group has been mainly on health effects and dosimetry. The group was of the opinion that although human provocation studies are more realistic in investigating effects of exposure in human bodies, in vivo and in vitro studies offer much greater control over exposure and environmental conditions, which is expected to result in greater reproducibility.

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p>This is a cohort study that investigated the association between mobile phone use and behavioural problems in adolescents. A total of 439 adolescents aged 12-17 were baseline tested between June 2012 and March 2013 and then for a follow-up investigation were tested a year later. Information on mobile phone use was obtained via two methods: questionnaire (self-reported) and records from the operators. Personal radiofrequency RF exposure was also measured in a small subgroup of participants. Overall, the authors did not find indications that RF exposure from mobile phone use affects the behaviour or concentration capacity of adolescents.

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Observational studies investigating the effects of RF exposure from mobile phones on health outcomes have the recurring issue of recall bias, since most studies use self-reported information to assess the exposure. This study by Roser et al found that the association between behavioural problems and RF exposure was stronger when the analysis was based on self-reported information, compared to the phone records. This indicates the presence of recall bias. The analysis based on the personal RF exposure measurement also revealed no association.

A review by the Scientific Committee on Emerging and Newly Identified Health Risks (SCENIHR, 2015) on RF and health discussed the available evidence regarding mobile phone use on development, cognitive function and behaviour in children and concluded that adverse effects have not been established, but the data are limited and further studies are recommended.

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This is a meta-analysis of in vitro studies that investigated the association between extremely low frequency (ELF) magnetic fields (MF) and spontaneous cell death (apoptosis). A total of 8 studies covering the period 2000-2010 were included in the meta-analysis. A total of 18 endpoints were analysed, which are combinations of these three factors: (i) magnetic fields ranging from 0 to 5 millitesla (mT); (ii) Exposure duration ranging from less than 24 hours to more than 5 days; (iii) normal or cancer cells. The overall odds ratio from all 18 endpoints was 1.18 (95% confidence interval = 1.15, 1.20). The authors concluded that exposure to ELF MF may increase the rate of apoptosis in both normal and cancer cells.

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This paper summarised the presentations given in a workshop jointly organised by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the World Health Organization (WHO). The workshop focused on the heat-related effects and thresholds of thermal damage for RF exposure, to gather valuable input into the upcoming revision of ICNIRP guidelines (PDF 647 kb) for limiting human exposure to RF fields originally developed in 1998. The workshop identified a knowledge gap in the relationship between temperature and harm, since it is variable across tissue and organ type. A great deal of knowledge in this area is based on mild hyperthermia condition, which may not be applicable in the condition of small temperature increase caused by RF exposure below the limits in the Guidelines. The workshop also found that the heating effects caused by RF sources are consistent with other heat sources and that absolute temperature of tissues is more relevant than temperature elevation in relation to thermal damage.

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This animal study investigated the effects of RF exposure on foetus development. A total of 80 female rats were divided equally into 2 groups: one was sham-exposed (group A) and the other was exposed to RF (group B) at a frequency of 1880-1900 MHz and at electric fields of 3.7 volts per metre (approximately 6% of the public exposure limit in the Australian Standard), for 12 hours per day, during pregnancy. After the pups were born, group A was further sham-exposed and group B was divided into 2 groups (sham-exposed and exposed) for 22 days. On day 17 of the experiment, the body length, head length and width, placenta width, and heart rate were examined. The study found that RF exposure did not influence any of the parameters except heart rate. It also found that there were structural changes in certain parts of the brain of the pups, where irradiation occurred both pre- and postnatally.

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This is a cross-sectional study that investigated the effects of mobile phone use on auditory function. Forty participants that have used mobile phones for at least 4 years were divided into 2 groups based on the duration of use: 60 minutes or less per day and more than 60 minutes per day. The phone-using ear was compared to the non-phone using ear. There were no statistically significant differences between the two ears and also between those who used mobile phones for long and short duration. The authors found that RF exposure from mobile phone does not affect auditory function.

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