In a special edition of CBC Marketplace, originally aired March 2017, journalist Wendy Mesley investigates the safety of cellphones, focusing on a little-known warning from the manufacturer hidden within your cellphone manual that advises you to keep the device at a certain distance from your body to ensure you don’t exceed the federal safety limit for radiofrequency (RF) exposure.
What the Manufacturer’s Warning Says
While the safe use warning may differ slightly from one phone to the next, the basics remain the same. Mesley reads the information from her iPhone:
“To reduce exposure to RF energy, use a hands-free option, such as speakerphone … Carry iPhone at least 5 millimeters [mm] away from your body to ensure exposure levels remain at or below the as tested levels.”
According to the report, “81 percent of Canadians have never seen the message in their phone or manual about carrying their phone 5 to 15 mm away from their body.”
In the real-world, most people carry their phones close to their body, usually in a pocket or bra. When popular cellphones were tested in direct contact to the body, they all exceeded the safety limit
What You Need to Know About Your Phone’s SAR Value
SAR is a measure of how much RF energy your body will absorb from the device when held at a specific distance from your body (ranging from 5 to 15 mm, depending on the manufacturer). It’s important to realize that the SAR value is not an indication of overall safety. As explained by the Federal Communications Commission (FCC)
Why SAR Ratings Are Terribly Flawed
In a nutshell, the phone is tested to assess how much RF energy is emitted when used under the worst of conditions. The testing itself was in fact devised long before cellphone usage became commonplace among toddlers and young children, whose skulls allow for far greater RF energy penetration. With the phone emitting at maximum power, a sensor is then used to measure the depth to which the RF energy is able to penetrate into the dummy head.
All the SAR rating seeks to measure is the short-term thermal effect of the radiation on your body, defined in terms of how much power is absorbed (watts) per unit of tissue (kilogram).
Different types of tissue, such as bone, brain, muscle and blood, all have differing levels of density and conductivity, which also affect the absorption rate. What this means is that a SAR rating is highly dependent on which part of your body is exposed to the radiation.
In the U.S. and Canada, the SAR limit for mobile devices used by the public is 1.6 W/kg per 1 gram of head tissue. There are several major problems with using SAR as our safety guideline.
For starters, the anthropomorphic mannequin (SAM) used to measure SAR is modeled after attributes of the heads of the top 10 percent of military recruits in 1989 — in other words, a 6-foot, 2-inch-tall, 220-pound male, which is larger than 97 percent of the American population. This means anyone smaller than SAM is more vulnerable to radiation penetration, especially children.
According to Om P. Gandhi, professor of electrical and computer engineering at the University of Utah:
“RF exposure to a head smaller than SAM will absorb a relatively higher SAR. The SAR for a 10-year-old is up to 153 percent higher than the SAR for the SAM model. When electrical properties are considered, a child's head's absorption can be over two times greater, and absorption of the skull's bone marrow can be 10 times greater than adults.”
Secondly, the FCC uses SAM to determine safe levels of ionizing radiation, not noniodizing radiation. Because nonionizing forms of EMF have so much less energy than ionizing radiation, it had long been believed that nonionizing electromagnetic fields were harmless to humans and other biological systems. However, as discussed below, science has shown nonionizing radiation can indeed cause physiological damage.
What’s more, the SAR of the radiation emitted by cellphones is only measured when the phone is actually on and in use, not when it’s sitting idle in your pocket (when it is still communicating with nearby cellphone towers and/or seeking the nearest Wi-Fi signal). Lastly, SAR standards haven’t been updated since 1996, despite the fact the cellphone technology has changed dramatically since then.
Government Research Confirms Safety Concerns
Mesley visits Devra Davis, Ph.D., who first became aware of the dangers of RF from cellphones and began speaking out about it in 2007. Since then, the scientific literature has doubled in size, and Davis is now more convinced of the dangers than ever.
Among the more damning studies are two government-funded animal studies that reveal GSM and CDMA radiation has carcinogenic potential. The finalized report of these two studies — conducted by the National Toxicology Program (NTP), an interagency research program under the auspices of the National Institute of Environmental Health Sciences — was released November 1, 2018.
While the preliminary report released in February 2018 significantly downplayed the findings, subsequent peer review upgraded the findings of risk. The NTP rates cancer risk based on four categories of evidence: “clear evidence” (highest), “some evidence,” “equivocal evidence,” and “no evidence” (lowest). According to the NTPs final report, the two studies, done on mice and rats of both sexes, found:
The studies also found evidence of DNA damage and damage to heart tissue in exposed male and female rats, but not mice, as well as prostate, liver and pancreatic tumors in both rats and mice.
While the NTP insists the exposure — nine hours a day for two years, which is the lifetime of a rodent — is far more extensive than that of heavy cellphone users, I would strongly disagree, seeing how many, especially the younger generation, have their cellphones turned on and near their body 24/7. Many are literally sleeping with their phone beneath their pillow.Cellphones are not the sole source of RF. Tablets, computers, smart TVs, wireless baby monitors and smart meters, just to name a few, are also sources of similarly harmful radiation.
NTP Findings Reproduced at Power Levels Below FCC Limits
Corroborating evidence was also published by the Ramazzini Institute just one month after the NTP released its preliminary report in February 2018. The Ramazzini study reproduces and clearly supports the NTP’s findings, showing a clear link between cellphone radiation and Schwann cell tumors (schwannomas)— but at a much lower power level than that used by NTP.
While NTP used RF levels comparable to what’s emitted by 2G and 3G cellphones (near-field exposure), Ramazzini simulated exposure to cellphone towers (far-field exposure). Ramazzini’s rats were exposed to 1.8 GHz GSM radiation at electric field strengths of 5, 25 and 50 volts per meter12 for 19 hours a day, starting at birth until the rats died either from age or illness.
To facilitate comparison, the researchers converted their measurements to watts per kilogram of body weight (W/kg), which is what the NTP used. Overall, the radiation dose administered in the Ramazzini study was up to 1,000 times lower than the NTP’s — and below the U.S. limits set by the FCC — yet the results are strikingly similar.
As in the NTP studies, exposed male rats developed statistically higher rates of heart schwannomas than unexposed rats. They also found some evidence, although weaker, that RF exposure increased rates of glial tumors in the brains of female rats.
Where Are All the Brain Tumors?
To investigate whether brain tumors are something you need to be concerned with as a cellphone user, Mesley visits neuro-oncologist Dr. Jay Easaw in Edmonton, Canada, who shows her images of one of the worst brain tumors he’s ever seen, located on the side of the brain where the patient — a very heavy cellphone user — held his phone.
Essaw has been part of the creation of a brain tumor registry, in the hopes of identifying causes. He believes we’ll see more studies showing a correlation between cellphone use and brain tumors as time goes on and heavy users since childhood start entering adulthood. “There’s no question that we’re seeing more young people coming into the clinic with brain tumors,” he says. “And the question is why.”
Incidence of glioblastoma multiforme (the deadliest type of brain tumor) more than doubled in the U.K. between 1995 and 2015. According to the authors of the NTP analysis, this dramatic increase is likely due to “widespread environmental or lifestyle factors” — which would include cellphone usage.
Mitochondrial Dysfunction, Not Brain Tumors, Is the Primary Hazard of Cellphone Radiation
While brain tumors may indeed be a concern, in my view, it’s not the primary one. The evidence suggests the primary hazard of cellphone radiation is really systemic cellular and mitochondrial damage which can contribute to any number of health problems and chronic diseases.
While an estimated 80,000 U.S. men, women and children are diagnosed with a brain tumor each year,19 787,000 people die from heart disease. So, while the relative rarity of brain cancer may lead you to believe that cellphone use is safe, that’s only because you’re looking at a less prevalent outcome.
The process of harm begins when low-frequency microwave radiation activates voltage-gated calcium channels (VGCCs),21 channels in the outer membrane of your cells. Once activated, the VGCCs open up, allowing an abnormal influx of calcium ions into the cell. This increased intracellular calcium and the accompanying increase in calcium signaling appears to be responsible for a majority of the damage that occurs.
For example, excess calcium activates nitric oxide, and while nitric oxide has many health benefits, massively excessive nitric oxide reacts with superoxide to produce peroxynitrites — extremely potent oxidant stressors. Peroxynitrites in turn modify tyrosine molecules in proteins to create nitrotyrosine and nitration of structural protein.
Changes from nitration are visible in human biopsy of atherosclerosis, myocardial ischemia, inflammatory bowel disease, amyotrophic lateral sclerosis and septic lung disease. Peroxynitrites can also cause single-strand DNA breaks.This pathway of oxidative destruction — triggered by low-frequency radiation emitted from mobile devices — may partially explain the unprecedented growth rate of chronic disease since 1990 and is a far greater concern than brain tumors.
Heart Problems, Neurological Disorders and Infertility Are Also Risks of EMF Exposure
Cellphone radiation has also been shown to have a significant impact on neurological and mental health, contributing to and/or worsening anxiety, depression and dementia, for example, and all of these conditions are rampant and growing more prevalent, even if brain cancer cases are lagging. (This also makes sense as brain dysfunction will occur much faster than a tumor, which can take decades.)
Research also suggests excessive EMF exposure is contributing to reproductive problems. For example, researchers have found prenatal exposure to power-frequency fields can nearly triple a pregnant woman’s risk of miscarriage.
According to lead author and senior research scientist at Kaiser Permanente’s research division, Dr. De-Kun Li, “This study provides fresh evidence, directly from a human population, that magnetic field exposure in daily life could have adverse health impacts,” adding his findings “should bring attention to this potentially important environmental hazard to pregnant women.”
According to Li, there are at least six other studies, in addition to two of his own, showing this link. EMF exposure may also play a significant role in testicular cancer and male infertility.
Studies have linked low-level electromagnetic radiation exposure from cellphones to an 8 percent reduction in sperm motility and a 9 percent reduction in sperm viability. Wi-Fi equipped laptop computers have also been linked to decreased sperm motility and an increase in sperm DNA fragmentation after just four hours of use.
How to Limit Your RF Exposure
While saying there’s no cause for concern, Health Canada still recommends replacing calls with texts, using hands-free devices and limiting use for children if you’re concerned about potential effects.
The U.S. has taken an identical approach. The U.S. Food and Drug Administration says that while any potential risk is “probably very small,” you can reduce your RF exposure by limiting the amount of time you spend on your cellphone and using the speaker or a headset to create more distance between the phone and your head.
There’s no doubt in my mind that RF exposure from cellphones and other wireless devices is a significant hazard to your health that will damage your DNA and contribute to chronic disease and premature aging. It needs to be addressed if you’re concerned about your health, and that of your family.
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