High levels of cellphone radiation linked to tumors in male rats -US study
High levels of cellphone radiation linked to tumors in male rats -US study
Female rats and mice exposed in the same way did not develop tumors, according to the preliminary report from the US National Toxicology Program (NTP), a part of the National Institute of Environmental Health Sciences.
The findings add to years of research meant to help settle the debate over whether cellphone radiation is harmful.
Although intriguing, the findings can not be extrapolated to humans, NTP scientists and the US Food and Drug Administration (FDA) said on Friday. They noted that the animal studies were meant to test extreme exposures to cell phone radiation, and that current safety limits on cellphone radiation are protective.
However, the two 10-year, $25 million studies — the most comprehensive assessments of health effects and exposure to radiofrequency radiation in rats and mice to date — do raise new questions about exposure to the ubiquitous devices.
In the studies, about 6 percent of male rats whose entire bodies were exposed to the highest level of cell phone radiation developed schwannomas — a rare type of tumor — in nerve tissue near their hearts, while there were no schwannomas in animals that were not exposed to radiation.
“The intriguing part of this is the kind of tumors we saw were similar to tumors noted for quite some time in some epidemiological studies in heavy duty cellphone users,” John Bucher, a senior scientist with NTP, said in a telephone interview.
“Of course, these were in the nerves in the ear and next to the brain, but the tumor types were the same as we saw in the heart.”
Dr. Otis Brawley, chief medical officer of the American Cancer Society, noted that the studies were negative for common tumors.
“These draft reports are bound to create a lot of concern, but in fact they won’t change what I tell people: the evidence for an association between cellphones and cancer is weak, and so far, we have not seen a higher cancer risk in people,” he said in a statement on Twitter.
Brawley said if cellphone users are concerned about this data in animals they should wear an earpiece.
Unlike ionizing radiation such as that from gamma rays, radon and X-rays, which can break chemical bonds in the body and are known to cause cancer, radiofrequency devices such as cellphones and microwaves emit radiofrequency energy, a form of non-ionizing radiation.
The concern with this type of radiation is that it produces energy in the form of heat, and frequent exposure against the skin could alter brain cell activity, as some studies have suggested.
In the NTP study, rats and mice were exposed to higher levels of radiation for longer periods of time than what people experience with even the highest level of cellphone use, and their entire bodies were exposed all at once, according to the draft report.
Bucher said the effect likely only showed up in the male rats because they were larger, and likely absorbed more radiation than the female rats or mice.
Cellphones typically emit lower levels of radiation than maximum levels allowed, the draft report said.
Cellphone radiation quickly dissipates, so the risk, if any, would be to areas of the body in close proximity to the device emitting the radiation, Bucher said.
He said the findings are intended to help inform the design of future cell phone technologies. The study looked at only 2G and 3G frequencies, which are still commonly used for phone calls. It does not apply to 4G or 5G, which use different frequencies and modulation, he said.
NTP, a part of the National Institutes of Health, will hold an external expert review of its findings on March 26-28.
Dr. Jeffrey Shuren, head of the FDA’s radiological health division, said there is not enough evidence to say cellphone use poses health risks to people.
“Even with frequent daily use by the vast majority of adults, we have not seen an increase in events like brain tumors,” he said in a statement. “We believe the current safety limits for cellphones are acceptable for protecting the public health.”
Asked what the public should take from the study, Bucher said, “I wouldn’t change my behavior based on these studies, and I haven’t.”
Nevertheless, the findings are potentially a concern for device makers, especially the world’s three biggest smartphone sellers, Apple Inc, Korea’s Samsung Electronics Co. Ltd. and China’s Huawei Technologies.
The CTIA, the trade association representing AT&T Inc, Verizon Communications Inc, Apple Inc, Sprint Corp, DISH Network Corp, and others, said on Friday that previous studies have shown cellphone RF energy emissions have no known heath risks.
“We understand that the NTP draft reports for its mice and rat studies will be put out for comment and peer review so that their significance can be assessed,” the group said.
Samsung and Apple did not immediately respond to requests for comment.
‘Touch the sun’: NASA spacecraft hurtles toward our star
CAPE CANAVERAL, Florida: Embarking on a mission that scientists have been dreaming of since the Sputnik era, a NASA spacecraft hurtled Sunday toward the sun on a quest to unlock some of its mysteries by getting closer than any object sent before.
If all goes well, the Parker Solar Probe will fly straight through the wispy edges of the sun’s corona, or outer atmosphere, in November. In the years ahead, it will gradually get within 3.8 million miles (6 million kilometers) of the surface, its instruments protected from the extreme heat and radiation by a revolutionary new carbon heat shield and other high-tech wizardry.
Altogether, the Parker probe will make 24 close approaches to our star during the seven-year, $1.5 billion journey.
“Wow, here we go. We’re in for some learning over the next several years,” said Eugene Parker, the 91-year-old astrophysicist for whom the spacecraft is named.
It was Parker who accurately theorized 60 years ago the existence of solar wind — the supersonic stream of charged particles blasting off the sun and coursing through space, sometimes wreaking havoc on electrical systems on Earth.
This is the first time NASA has named a spacecraft after a living person.
As Parker and thousands of others watched, a Delta IV Heavy rocket carried the probe aloft, thundering into the clear, star-studded sky on three pillars of fire that lit up the middle-of-the-night darkness.
NASA needed the mighty 23-story rocket, plus a third stage, to get the Parker probe — the size of a small car and well under a ton — racing toward the sun, 93 million miles (150 million kilometers) from Earth.
A Saturday morning launch attempt was foiled by last-minute technical trouble. But Sunday gave way to complete success.
It was the first rocket launch ever witnessed by Parker, a retired University of Chicago professor. He said it was like looking at photos of the Taj Mahal for years and then beholding the real thing in India.
“I really have to turn from biting my nails in getting it launched, to thinking about all the interesting things which I don’t know yet and which will be made clear, I assume, over the next five or six or seven years,” Parker said on NASA TV.
Among the mysteries scientists hope to solve: Why is the corona hundreds of times hotter than the surface, which is 10,000 degrees Fahrenheit (5,500 degrees Celsius)? And why is the sun’s atmosphere continually expanding and accelerating, as Parker theorized in 1958?
“The only way we can do that is to finally go up and touch the sun,” said project scientist Nicola Fox of Johns Hopkins University. “We’ve looked at it. We’ve studied it from missions that are close in, even as close as the planet Mercury. But we have to go there.”
A better understanding of the sun’s life-giving and sometimes violent nature could also enable earthlings to better protect satellites and astronauts in orbit, along with the power grids so vital to today’s technology-dependent society, said Thomas Zurbuchen, NASA’s science mission chief.
Parker, the probe, will start shattering records this fall. On its very first brush with the sun, it will come within 15.5 million miles (25 million kilometers), easily beating the current record of 27 million miles (43 million kilometers) set by NASA’s Helios 2 spacecraft in 1976.
By the time Parker gets to its 22nd, 23rd and 24th orbits of the sun in 2024 and 2025, it will be even deeper into the corona and traveling at a record 430,000 mph (690,000 kilometers per hour). Nothing from planet Earth has ever gone that fast.
Even Fox has difficulty comprehending the mission’s derring-do.
“To me, it’s still mind-blowing,” she said. “Even I still go, ‘Really? We’re doing that?’“
The 8-foot (2.4-meter) heat shield will serve as an umbrella that will shade the spacecraft’s scientific instruments, with on-board sensors adjusting the protective cover as necessary so that nothing gets fried.
A mission to get up close and personal with our star has been on NASA’s books since 1958. The trick was making the spacecraft compact and light enough to travel at incredible speeds and durable enough to withstand the punishing environment.
“We’ve had to wait so long for our technology to catch up with our dreams,” Fox said.