Baby Monitor Radiation Research

The influence of the reflective environment on the absorption of a human male exposed to representative base station antennas from 300 MHz to 5 GHz.

Vermeeren G et al. · 2010

Effects of combined radiofrequency radiation exposure on the cell cycle and its regulatory proteins

Unknown authors · 2010

Researchers exposed MCF7 cells to single 837 MHz or combined 837 and 1950 MHz RF radiation at 4 W/kg for 1 hour. They assessed DNA synthesis rate, cell cycle distribution, and levels of cell cycle regulatory proteins including p53, p21, cyclins, and cyclin-dependent kinases. Neither single nor combined RF radiation exposure altered DNA synthesis, cell cycle distribution, or regulatory protein levels, unlike ionizing radiation which caused changes.

Effects of combined radiofrequency radiation exposure on the cell cycle and its regulatory proteins

Unknown authors · 2010

Researchers exposed breast cancer cells to single (837 MHz) and combined (837 + 1950 MHz) radiofrequency radiation at 4 W/kg for one hour to test effects on cell division and DNA synthesis. Unlike ionizing radiation which disrupted cell cycles, neither single nor combined RF exposure affected cell division, DNA synthesis, or regulatory proteins that control cell growth.

Exposure assessment in front of a multi-band base station antenna

Unknown authors · 2010

Researchers used computer modeling to measure how much radiation workers absorb when standing near multi-band cell tower antennas operating at 900, 1800, and 2100 MHz frequencies. They found that higher frequencies create more localized radiation absorption, while distance from the antenna determines which safety limits matter most. The study shows that combining multiple frequencies increases total radiation exposure in predictable ways.

Absence of short-term effects of UMTS exposure on the human auditory system.

Parazzini M et al. · 2010

Researchers investigated the potential effects of UMTS exposure at a high specific absorption rate on the human auditory system in 73 healthy young adults. Participants received a 20-minute UMTS exposure at 1947 MHz with a maximum SAR of 1.75 W/kg in a double-blind comparison of genuine and sham exposure. No consistent pattern of effects was found on hearing thresholds, otoacoustic emissions, or auditory evoked potentials. The study concluded that short-term UMTS exposure at this SAR does not cause measurable immediate effects on the human auditory system.

Lack of adverse effects of whole-body exposure to a mobile telecommunication electromagnetic field on the rat fetus.

Takahashi S et al. · 2010

Researchers exposed pregnant rats to 2.14 GHz electromagnetic fields for 20 hours per day during gestation and lactation at low and high specific absorption rates. No abnormal findings were observed in the dams, the F1 generation, or the F2 offspring across multiple parameters including growth, organ weights, survival, development, hormonal status, memory function, reproductive ability, embryotoxicity, and teratogenicity. The authors concluded that under their experimental conditions, whole-body exposure to 2.14 GHz for 20 hours per day during gestation and lactation did not cause any adverse effects on pregnancy or the development of rats.

Variation of the dielectric properties of tissues with age: the effect on the values of SAR in children when exposed to walkie-talkie devices.

Peyman A, Gabriel C, Grant EH, Vermeeren G, Martens L · 2009

Microwaves from Mobile Phones Inhibit 53BP1 Focus Formation in Human Stem Cells Stronger than in Differentiated Cells: Possible Mechanistic Link to Cancer Risk

Unknown authors · 2009

They analyzed 53BP1 foci marking DNA repair sites using laser confocal microscopy. Microwaves inhibited 53BP1 focus formation in both human primary fibroblasts and mesenchymal stem cells, with the same GSM (915 MHz) and UMTS (1947.4 MHz) frequencies effective across all cell types. Exposure at 905 MHz did not inhibit foci in differentiated cells but showed some effects in stem cells, and stem cells did not adapt to chronic exposure over 2 weeks unlike fibroblasts.

Microwaves from Mobile Phones Inhibit 53BP1 Focus Formation in Human Stem Cells Stronger than in Differentiated Cells: Possible Mechanistic Link to Cancer Risk

Unknown authors · 2009

Researchers exposed human stem cells and mature cells to cell phone radiation at frequencies used by GSM (915 MHz) and UMTS (1947.4 MHz) networks. They found that radiation disrupted DNA repair processes more severely in stem cells than in mature cells, with stem cells showing impaired formation of proteins needed to fix DNA breaks. This matters because stem cells are particularly important for cancer development, and the study suggests they may be more vulnerable to cell phone radiation damage.

Effects of radiofrequency electromagnetic fields (UMTS) on reproduction and development of mice: A Multi-generation Study

Sommer et al. · 2009

Male and female C57BL mice were exposed lifelong to UMTS fields at 1966 MHz with SARs of 0, 0.08, 0.4, and 1.3 W/kg. Development and fertility were tracked over four generations using histological, physiological, reproductive, and behavioral measures. No harmful effects on fertility or development were observed. Pup numbers and development were unaffected by exposure. Some data suggested effects on food consumption without a clear dose-response relationship.

Effects of short-term W-CDMA mobile phone base station exposure on women with or without mobile phone related symptoms

Furubayashi T et al. · 2009

Researchers conducted a double-blind, cross-over study with 11 women reporting mobile phone related symptoms and 43 control women. Participants were exposed to 2.14 GHz W-CDMA fields at 10 V/m for 30 minutes under continuous, intermittent, and sham conditions. The symptom group did not detect real exposure better than controls but reported more discomfort during both real and sham exposure, with no differences in psychological, cognitive, or autonomic measures.

Effects of short-term W-CDMA mobile phone base station exposure on women with or without mobile phone related symptoms.

Furubayashi T et al. · 2009

Researchers exposed 54 women (including 11 with self-reported electromagnetic hypersensitivity) to cell tower radiation at 10 V/m for 30 minutes in a controlled lab setting. Neither group could detect when they were actually being exposed to EMF, and both groups showed identical biological responses whether exposed to real or fake radiation. The study found no evidence that people with electromagnetic hypersensitivity react differently to cell tower emissions than healthy controls.

Effects of gestational exposure to 1.95‐GHz W‐CDMA signals for IMT‐2000 cellular phones: Lack of embryotoxicity and teratogenicity in rats

Ogawa K et al. · 2009

The study exposed four groups of pregnant CD(SD) IGS rats to a 1.95-GHz W-CDMA signal for 90 minutes daily on gestational days 7–17, with spatial average brain SARs of 0.67 and 2.0 W/kg for low and high exposure groups. On gestational day 20, all dams were killed by cesarean section and fetuses were evaluated for numbers of live, dead, and resorbed embryos, placental weights, sex ratios, fetal weights, and external, visceral, and skeletal abnormalities. Maternal body weight gain did not differ between groups, and no adverse effects were observed on any reproductive or embryotoxic parameters.

Effects of gestational exposure to 1.95-GHz W-CDMA signals for IMT-2000 cellular phones: Lack of embryotoxicity and teratogenicity in rats.

Ogawa K et al. · 2009

Researchers exposed pregnant rats to cell phone radiation (1.95-GHz signals) for 90 minutes daily during pregnancy to see if it would harm developing babies. They tested different exposure levels, including some higher than typical cell phone use, and found no effects on pregnancy outcomes, fetal development, or birth defects. The study suggests that cell phone radiation at these levels doesn't appear to cause developmental problems during pregnancy.

Short‐term exposure to mobile phone base station signals does not affect cognitive functioning or physiological measures in individuals who report sensitivity to electromagnetic fields and controls

Eltiti S et al. · 2009

Researchers exposed 44 sensitive and 44 matched-control participants to GSM, UMTS, and sham signals for 50 minutes at 10 mW/m2 under double-blind conditions. Participants performed digit symbol substitution, digit span, and mental arithmetic tasks during exposure. Cognitive functioning and physiological measures including blood volume pulse, heart rate, and skin conductance were not affected by exposure.

A comparison of foetal SAR in three sets of pregnant female models.

Dimbylow PJ, Nagaoka T, Xu XG. · 2009

The study compared foetal specific absorption rate (SAR) across three sets of pregnant female computational models. The models included a 26-week foetal model from the National Institute of Information and Communications Technology, Tokyo, and models at 13, 26, and 38 weeks from Rensselaer Polytechnic Institute. FDTD calculations were performed at a resolution of 2 mm for a plane wave with a vertically aligned electric field incident upon the body from the front, back and two sides from 20 MHz to 3 GHz under isolated conditions. The researchers compared external electric field values required to produce the ICNIRP public exposure localized restriction of 2 W kg(-1) when averaged over 10 g of the foetus with the ICNIRP reference levels.

Effects of W-CDMA 1950 MHz EMF emitted by mobile phones on regional cerebral blood flow in humans

Mizuno Y et al. · 2009

This was the first study to investigate the effects of the third generation system on regional cerebral blood flow in humans, comparing W-CDMA electromagnetic field exposure versus sham exposure. Nine healthy male volunteers participated and underwent PET scans before, during, and after 30 minutes of unilateral EMF exposure. The subtraction analysis showed no significant regional cerebral blood flow changes from the EMF conditions compared to sham exposure.

Reactive oxygen species formation is not enhanced by exposure to UMTS 1950 MHz radiation and co-exposure to ferrous ions in Jurkat cells.

Brescia F et al. · 2009

Researchers measured reactive oxygen species (ROS) production in human lymphoblastoid cells exposed to a 1950 MHz UMTS signal at Specific Absorption Rates of 0.5 and 2.0 W/kg. Exposures ranged from short durations of 5 to 60 minutes up to 24 hours, and the study also tested RF radiation given before or at the same time as ferrous ions. RF exposure did not increase ROS formation or affect cell viability, and combining RF with ferrous ions did not produce more ROS than ferrous ions alone.

Reactive oxygen species formation is not enhanced by exposure to UMTS 1950 MHz radiation and co-exposure to ferrous ions in Jurkat cells

Brescia F et al. · 2009

Researchers exposed human immune cells to 1950 MHz cell phone radiation (the frequency used by 3G networks) to see if it would trigger oxidative stress, a cellular damage process linked to aging and disease. They tested various exposure durations and power levels, both alone and combined with iron compounds known to cause oxidative stress. The study found no increase in harmful reactive oxygen species or cell death from the radiation exposure under any conditions tested.

Thermal effects of mobile phones on facial nerves and surrounding soft tissue.

Acar GO, Yener HM, Savrun FK, Kalkan T, Bayrak I, Enver O. · 2009

Tissue temperature around the facial nerve was measured with a four-channel Luxtron fiber optic system and rose by 0.39 K during and immediately after exposure, returning to baseline after 25 minutes. Facial nerve compound muscle action potential amplitudes decreased significantly after exposure but returned to normal at the 25-minute measurement.

Cytogenetic effects of exposure to 2.3 GHz radiofrequency radiation on human lymphocytes in vitro.

Hansteen IL et al. · 2009

The aim was to test if exposure used in mobile phones and wireless network technologies would induce DNA damage in cultured human lymphocytes with and without a known clastogen. Lymphocytes from six donors were exposed to 2.3 GHz, 10 W/m(2) continuous waves, or 2.3 GHz, 10 W/m(2) pulsed waves (200 Hz pulse frequency, 50% duty cycle). Mitomycin C was added to half of the cultures. No statistically significant differences were observed between control and exposed cultures. A weak trend for more chromosomal damage with the interaction of pulsed fields with mitomycin C compared to a constant field was observed.

Effects of UMTS cellular phones on human hearing: results of the European project EMFnEAR

Parazzini M et al. · 2009

Participants received 20 minutes of genuine or sham RF exposure at maximum phone output with 69 mW/kg SAR in the cochlea region. Auditory function was measured before and after exposure using hearing thresholds, otoacoustic emissions, and auditory evoked potentials. No consistent pattern of effects was found, and an isolated high-frequency threshold change was not statistically significant after multiple comparison correction. Researchers concluded that short-term UMTS exposure at maximum consumer phone output does not cause measurable immediate auditory effects.

Analysis of RF exposure in the head tissues of children and adults

Unknown authors · 2008

Researchers developed child head models based on magnetic resonance imaging and analyzed maximum SAR over 10 g in seven child and six adult heterogeneous head models. They also assessed SAR over 1 g in specific tissues for both child and adult head models. Simulations showed that maximum SAR over 10 g differed little between adults and children relative to variability, but maximum SAR in 1 g of peripheral brain tissue was about two times higher in child models aged 5–8 years than in adult models, with no difference for older children.

Radiofrequency electromagnetic fields (UMTS, 1,950 MHz) induce genotoxic effects in vitro in human fibroblasts but not in lymphocytes.

Schwarz C et al. · 2008

Researchers exposed human cultured fibroblasts and human lymphocyte cultures to 1,950 MHz UMTS electromagnetic fields at specific absorption rates below the safety limit of 2 W/kg. UMTS exposure increased the comet tail factor and induced centromere-negative micronuclei in human cultured fibroblasts in a dose- and time-dependent way. Incubation for 24 hours at a SAR of 0.05 W/kg produced a statistically significant rise in both the comet tail factor and micronuclei (P = 0.02). No UMTS effect was found in lymphocytes, whether unstimulated or stimulated with Phytohemagglutinin. The researchers concluded that UMTS exposure may cause genetic alterations in some but not in all human cells in vitro.

Radiofrequency electromagnetic fields (UMTS, 1,950 MHz) induce genotoxic effects in vitro in human fibroblasts but not in lymphocytes.

Schwarz C et al. · 2008

Researchers exposed human cells to 3G mobile phone radiation (UMTS at 1,950 MHz) at levels well below safety limits to test for DNA damage. They found that certain cells called fibroblasts showed significant genetic damage after exposure, while immune cells called lymphocytes were unaffected. This suggests that 3G radiation can cause DNA damage in some human cell types even at supposedly safe exposure levels.