With the National Toxicology Program issuing its final report on cancer, rats and cell phone radiation, one can draw the following conclusions from their data. There is a roughly linear relationship between gliomas (brain cancers) and schwannomas (cancers of the nerve sheaths around the heart) with increased absorption of 900 MHz radiofrequency radiation for male rats. The rate of these cancers in female rats is about one third the rate in male rats; the rate of gliomas in female humans is about two thirds the rate in male humans. Both of these observations can be explained by a decrease in sensitivity to chemical carcinogenesis in both female rats and female humans. The increase in male rat life spans with increased radiofrequency absorption is due to a reduction in kidney failure from a decrease in food intake. No such similar increase in the life span of humans who use cell phones is expected.
Comments on the National Toxicology Program Report on Cancer, Rats and Cell Phone
Radiation
Bernard J. Feldman
Department of Physics and Astronomy
University of Missouri-St. Louis, St. Louis, MO 63121
Abstract
With the National Toxicology Program issuing its final report on cancer, rats and cell phone
radiation, one can draw the following conclusions from their data. There is a roughly linear
relationship between gliomas (brain cancers) and schwannomas (cancers of the nerve sheaths
around the heart) with increased absorption of 900 MHz radiofrequency radiation for male rats.
The rate of these cancers in female rats is about one third the rate in male rats; the rate of gliomas
in female humans is about two thirds the rate in male humans. Both of these observations can be
explained by a decrease in sensitivity to chemical carcinogenesis in both female rats and female
humans. The increase in male rat life spans with increased radiofrequency absorption is due to a
reduction in kidney failure from a decrease in food intake. No such similar increase in the life
span of humans who use cell phones is expected.
This spring, the National Toxicology Program (NTP) issued its final report on their $25
million study on cancer in rats and mice exposed to 900 MHz cell phone radiation. The study
consisted of Sprague Dawley rats and B6C3F1 mice absorbing 900 MHz radiofrequency
radiation at four different absorption levels: 0 W/kg, 1.5 W/kg, 3.0 W/kg and 6.0 W/kg. The
frequency of 900 MHz was chosen because it is typical for use in cell phones and other wireless
devices. The exposure times were 10 minutes on and 10 minutes off for 18 hours a day, resulting
in a total exposure of nine hours daily. The animals were exposed whole body from in utero until
two years of age. The animals were monitored so that the exposure was at a low non-thermal or
non-heating level. Groups of 90 animals were used for each species, sex, modulation system,
and absorption level.1
The study used two different radiofrequency modulation systems: Global System for Mobile
(GSM) and Code Division Multiple Access (CDMA). The NTP results were reported for each
modulation system separately. However, I will argue below that the results from the two
modulation systems should be combined.
A modulated electromagnetic wave as a function of time, t, can be expressed as
E(t) = Eo cos(ot)cos(mt)
Eo is the amplitude of the wave, o is the carrier frequency and m is the modulation frequency.
From trigonometry,
E(t) = 0.5 Eo {cos[(o + m)t] + cos[(o – m)t]}
Typically, m is much smaller than o and thus the modulation frequency can be neglected.
Looking at all the NTP data, there is no statistically significant difference between the GMS and
the CDMA data, which provides strong experimental evidence for neglecting which modulation
system was used.
Combining the GMS and the CDMA data gives the results shown in Figures 1 and 2 for the
number of gliomas and schwannomas detected in groups of 180 male and female rats as a
function of the absorption of 900 MHz radiofrequency radiation. Gliomas are cancers of the
brain and schwannomas are cancers of the nerve sheaths surrounding the heart. No cancers were
observed in any of the mice. An explanation for all these results is given by this author in
previous publications.2
One can draw the following conclusions: there is roughly a linear relationship between
cancer rates and radiofrequency absorption for schwannomas and gliomas in male rats. The
cancer rate of female rats is about one third that of male rats (10 total cancers in female rats vs 31
total cancers in male rats).
It is worth mentioning that the rate of gliomas (number of cancers per 100,000 of population)
in human beings in the United States is about a third less in females than in males. This was true
in 1980 before the wide spread usage of cell phones and was true in 2000 when cell phones were
in wide use.3 (The rate of gliomas roughly doubled from 1980 to 2000, but the interpretation of
this observation is complicated by the advent of better detection systems.) The NTP study of
bioassays observed that “male rats are more sensitive to chemical carcinogenesis compared to
female rats.”4 May I suggest that this observation explains the difference in rates of gliomas and
schwannomas in male and female rats and also the difference in the rates of gliomas in male and
female humans. The connection between sensitivity to chemical carcinogenesis and exposure to
radio frequency radiation is also spelled out in my previous publications.2
The second interesting NTP result was that the irradiated male rats lived longer than the non-
irradiated male rats and the greater the radiation absorption, the greater the life span.1 The
survival rate of male rats at 105 weeks increased from 28% at 0.0 W/kg to 62% at 6.0 W/kg. The
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