studies examine aspects of RFR exposure
studies, published in the journal "Radiation Protection Dosimetry",
have examined various aspects of exposure to radiofrequency radiation
The first, by
Cooper and associates from the National Radiological Protection
Board in the UK, describes the use of a personal monitor by individuals
who are occupationally exposed to RFR. The authors developed a data
logger that could be attached to the monitor by a fibre-optic cable.
The workers could wear the monitor and logger in their daily tasks.
The authors say that the instruments could be useful in epidemiological
studies, but point out that logging personal monitors, with sensors
and logger combined in a single compact unit, have recently become
Adda and colleagues
from Torino in Italy, validated a ray-tracing model for electromagnetic
field calculation, to predict irradiation from base stations in
urban environments. They found that the ray-tracing model calculates
electric fields with good accuracy.
The third paper,
also from Italy, used special phones that had been modified to allow
the continuous logging of power emitted during calls. In this way
Ardoino and colleagues were able to determine the average power
emitted by the phones in different conditions of use. They could
also measure the distribution of power levels over prolonged periods
of normal use of phones.
Cooper TG, Allen SG, Blackwell RP, Litchfield I, et al. Assessment
of occupational exposure to radiofrequency fields and radiation.
Radiat Prot Dosim 2004;111:191-203.
S, Anglesio L, d'Amore G, Mantovan M, et al. Ray-tracing techniques
to assess the electromagnetic field radiated by base stations: application
and experimental validation in an urban environment. Radiat Prot
L, Barbieri E, Vecchia P. Determinants of exposure to electromagnetic
fields from mobile phones. Radiat Prot Dosim 2004;111:403-406.
exposure does not alter melatonin output in rats
studies have shown no effect of radiofrequency radiation on melatonin
excretion by animals. A new study from Japan adds to the list. Rats
subjected to 4 hours of RFR at 1439 MHz (SAR to the brain of 7.5
W/kg, about four times as much as that from cell phones) did not
alter their secretion of melatonin. Melatonin has excited interest
because some authorities believe that it plays a role in cancer
prevention. The authors of the study emphasize the need for studies
of longer exposure.
For more, see
"Research- Toxicological Experiments
- Others - Hormones".
Hata K, Yamaguchi Y, Tsurita G, Watanabe S, et al. Short term exposure
to 1439 MHz pulsed TDMA field does not alter melatonin synthesis
in rats. Bioelectromagnetics 2005;26:49-53.
effect of long-term EMF exposure on development of rat brain tumours
There have been
3 studies of the effect of exposure to electromagnetic fields (EMF)
on rats that have been exposed also to N-ethylnitrosurea (ENU),
which promotes the development of brain tumours. Another study has
now been published, and, like the others, showed no increase in
the incidence of brain tumours in rats exposed to EMF, compared
with those sham-exposed. The rats were exposed to EMF at 1.439 GHz
frequency for about 2 years, at SAR of 0.67 W/kg in one group and
2.0 W/kg in another.
For more, see
"Research - Toxicological experiments
- cancer studies - tumour growth and development".
Shirai T, Kawabe M, Ichihara T, Fujiwara O, et al. Chronic exposure
to 1.439 GHz electromagnetic field used for cellular phones does
not promote N-ethylnitrosourea induced central nervous system tumors
in F344 rats. Bioelectromagnetics 2005;26:59-68.