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The Science Of Radiofrequency: Why Cell Phones, Microwaves, Wi-Fi, And Smart Meters Are Unlikely To Pose Health Risks

Cell phones, microwave ovens, wi-fi, smart meters. What do they have in common? They all emit radiation in the radiofrequency range. And they all radiate controversy. Given that these devices are set to become as commonplace as light bulbs, it is understandable that questions arise about their possible health effects. There are all sorts of allegations that exposure can trigger ailments ranging from headaches to cancer. Allegations, however, do not amount to science. And there is a lot of science to be considered.

Let’s start with the fact that an alternating current flowing through a wire generates an electromagnetic field around it. This field can be thought of as being made up of discrete bundles of energy called “photons” that are created as the electrons in the wire flow first in one direction then in the other. Photons spread out from the wire, their energy depending on the frequency with which the current changes direction. The number of photons emitted, referred to as the ‘intensity’ or ‘power” of the radiation, depends on the voltage, the current and the efficiency of the circuit to act as an antenna.

In ordinary household circuits, the direction of the current changes sixty times a second, that is, it has a frequency of 60 Hz, the unit being named after Heinrich Rudolf Hertz, the first scientist to conclusively prove the existence of electromagnetic waves. The photons emitted by such a circuit travel through space and have the capacity to induce a 60Hz current in any conducting material they encounter. Essentially, we have a “transmitter” and a “receiver.” If special circuitry is used to produce current in the range of 10 million (10MHz) to 300 billion Hz (300 GHz), the photons emitted are said to be in the radiofrequency region of the electromagnetic spectrum. That’s because with appropriate modulation at the transmitter (amplitude modulation (AM), or frequency modulation (FM)) these photons can induce a current in an antenna that can be converted into sounds or images.

But what happens when photons in this energy range interact with living tissue, such as our bodies? The greatest concern would be the breaking of bonds between atoms in molecules. Disrupting the molecular framework of proteins, fats and particularly nucleic acids can lead to all sorts of problems, including cancer. However, photons associated with radiofrequencies do not have enough energy to do this, no matter what their intensity. An analogy may be in order.

Consider a weather vane sitting on a roof. It is mounted on a sturdy metal rod, but of course can spin. You decide you want to knock it off the roof, but all you have are tennis balls. You start throwing the balls, but even if you hit the support, nothing happens. You just can’t impart enough energy to the ball to have it break a metal rod. And it doesn’t matter if you gather all your friends, and they all throw balls at the same time. You may have increased the “intensity” of your efforts, but it doesn’t matter, because no ball has enough energy. Of course if you had a cannon, you could knock down the target with one shot. That’s why high energy photons such as generated by very high frequency currents, as in x-rays, are dangerous. They can break chemical bonds! While you are not going to damage the weather vane with the tennis balls, you can surely make it spin, and the friction generated will heat up the base, the extent depending on how many balls are thrown.

Now, back to our photons. In the radiofrequency region, no photon has enough energy to break chemical bonds, but they can make molecules move around, generating heat. The more photons released, the greater the heating effect. This is exactly how microwave ovens work. They operate at radiofrequencies, but at a very high intensity or “power” level, meaning they bombard the food with lots of photons causing the food to heat up. You certainly wouldn’t want to crawl into a working microwave oven and close the door behind you. Similarly, you wouldn’t want to stand right next to a high power radio transmitting antenna, such as used by radio or TV stations, because you could get burned very badly. But the number of photons encountered drops very quickly with distance as they spread out in all directions, so that even standing a few meters from the base of such an antenna would not cause any sensation of heat. Just think of how quickly the heat released by a light bulb drops off with distance.

The “smart meters” that are being installed by electrical utilities monitor the use of electricity and relay the information via a built-in radio transmitter. But the radiation to which people are exposed from these meters quickly drops off with distance, as with the light bulb, and is way below established safety limits. Furthermore, the smart meters only transmit for a few milliseconds at a time for a grand total of a few minutes a day! Cordless phones, cell phones, routers, baby monitors, video game controls and especially operating microwave ovens expose us to similar radiation, usually at far higher levels. Smart meters are responsible for a very small drop in the radiofrequency photon bucket.

It must be pointed out, though, that safety standards are essentially based on the heating of tissues. But what about the possibility of “non-thermal” effects? What if radiofrequency photons cause damage by some other mysterious mechanism? Over the last 30 years more than 25,000 peer-reviewed papers have been published on electromagnetic fields and health, many devoted to non-thermal effects. Health agencies do not find present evidence persuasive of a hazard at ordinary exposure levels, and given the extent of research that has been carried out, it is unlikely that one will be identified in the future.

Although an overwhelming number of studies on cell phones and brain cancer have shown no effect, admittedly some have suggested a barely detectable link. Despite the weak evidence, the International Agency for Research on Cancer has classified electromagnetic fields associated with radiofrequencies as “possibly carcinogenic,” indicating a level of suspicion without any implication that the fields actually cause cancer. This notion pertains to cell phone use and has nothing to do with the far weaker fields associated with wi-fi and smart meters. I would have no issue with a smart meter in my house.

What then about those consumers who claim they have developed symptoms after smart meters were installed? I think it is appropriate to consider John Milton’s poetic view of the power of imagination: “The mind is its own place, and in itself can make a heaven of hell and a hell of heaven.”

***

Joe Schwarcz, Ph.D., is the Director of McGill University’s Office for Science and Society and teaches a variety of courses in McGill’s Chemistry Department and in the Faculty of Medicine with emphasis on health issues, including aspects of “Alternative Medicine”.  He is well known for his informative and entertaining public lectures on topics ranging from the chemistry of love to the science of aging.  Using stage magic to make scientific points is one of his specialties.

Defining The Label: What Is An Antivaxer?

Labels are a cognitive double-edged sword. We need to categorize the world in order to mentally capture it – labels help us organize our mental maps of the overwhelming complexity of things and to communicate with each other. But labels can also be mental prisons, when they substitute for a thorough, nuanced, or individualized assessment – when categorization becomes pigeon-holing.

We use many labels in our writings here, out of necessity, and we try to be consistent and thoughtful in how we define the labels that we use, recognizing that any sufficiently complex category will be necessarily fuzzy around the edges. We have certainly used a great deal of electrons discussing what exactly is science-based medicine, and that the label of so-called alternative medicine is really a false category, used mainly for marketing and lobbying (hence the caveat of “so-called”).

We get accused of using some labels for propaganda purposes, particularly “antivaccinationist” (often shortened to “antivaxer”). Also “denier” or “denialist”, as in germ-theory denier. Even though we often apply labels to ourselves, no one likes having an unflattering label applied to them, and so we have frequent push-back against our use of the above terms.

As with many such terms, Read more »

*This blog post was originally published at Science-Based Medicine*

Dealing With Cyclic Vomiting Syndrome Given How Little Is Known About The Condition

I have been working as an ER doctor for over a decade, and in that time I have come to recognize that there are certain complaints, and certain patients who bear these complaints, that are very challenging to take care of. I’m trying to be diplomatic here. What I really mean is that there are certain presentations that just make you cringe, drain the life force out of you, and make you wish you’d listened to mother and gone into investment banking instead. Among these, perhaps most prominently, is that of the patient with cyclic vomiting syndrome.

The diagnosis of cyclic vomiting syndrome, or CVS, is something which is only in recent years applied to adult patients.  Previously, it was only described in the pediatric population. It has generally been defined as a disease in which patients will have intermittent severe and prolonged episodes of intractable vomiting separated by asymptomatic intervals, over a period of years, for which no other adequate medical explanation can be found, and for which other causes have been ruled out.

That is not much in the way of good literature about this disease entity, which is surprising, because it is something that I see in the emergency department fairly regularly, and something with which nearly all emergency providers are quite familiar. These patients are familiar to us in part because we see them again and again, in part because they are memorable because they are so challenging to take care of.

Some things about the cyclic vomiting patient that pose particular challenges: Read more »

*This blog post was originally published at Movin' Meat*

Is Prince Charles Overstepping His Role By Promoting Alternative Medicine?

Prince Charles is a big supporter of “natural” medicine, which in practice means unscientific and ineffective medicine. He has no particular expertise in this area, and there is absolutely no legitimate reason why he should have any influence over the practice of medicine in the UK. But he is the Prince of Wales, and he has chosen to use that celebrity to promote CAM.

Prince Charles has also recently been criticized for his credulous support for medical nonsense. The Telegraph recently reported that Simon Singh, co-author with Edzard Ernst of Trick or Treatment, and exposer of CAM pseudoscience, spoke about Prince Charles at the recent Hay Festival in India. Singh had some sharp criticism, including:

He only wants scientific evidence if it backs up his view of the natural treatment of health conditions…

We presented evidence that disputes the value of alternative medicine and despite this he hasn’t changed his mind…

Singh’s point is that Prince Charles is Read more »

*This blog post was originally published at Science-Based Medicine*

Current System Of Medical Malpractice Targets The Wrong People

When lawyers talk, I listen. Two attorneys penned a piece on medical malpractice reform in the April 21st issue of The New England Journal of Medicine, the most prestigious medical journal on the planet. Here is an excerpt from their article, New Directions in Medical Liability Reform.

The best estimates are that only 2 to 3% of patients injured by negligence file claims, only about half of claimants recover money, and litigation is resolved discordantly with the merit of the claim (i.e., money is awarded in nonmeritorious cases or no money is awarded in meritorious cases) about a quarter of the time.

This is not self-serving drivel spewed forth by greedy, bitter doctors, but a view offered by attorneys, esteemed officers of the court. Apply the statistics in their quote to your profession. Would you be satisfied if your efforts were benefiting 2-3% of your customers or clients? Would this performance level give me bragging rights as a gastroenterologist? Perhaps, I should attach a new slogan to my business card.

Michael Kirsch, MD
Gastroenterologist
Correct Diagnosis and Treatment in 2-3% of Cases
We would have to Read more »

*This blog post was originally published at MD Whistleblower*

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