4 ms·
Also, 2.5 W/kg in a shielded room is far, far more than 1.6 W/kg exposure. Cell phone radiation, when it even goes through your head, keeps on going right thro
by hwillis 8y ago
Also, 2.5 W/kg in a shielded room is far, far more than 1.6 W/kg exposure. Cell phone radiation, when it even goes through your head, keeps on going right through to the other side[1]. In a shielded room, the radiation bounces off the walls until it's absorbed by the stuff in the room... ie the rats. The absorbed power in humans is microwatts. The rats were absorbing fractions of a watt.
[1]: as evidenced by the fact that cell phones actually work. When you cover them up with your hand, you don't suddenly drop the call.
- IshKebab 8y agoNo it isn't. W/kg is a measure of absorbed radiation.
- OJFord 8y agoNo, it's just a unit. It's the output of your speakers to the amount of sugar I consume in a year if we want it to be.
- hwillis 8y agoAnd a cell phone emits <1 W total, of which tens of millionths or less are absorbed. I was pointing out the difference between W/kg absorption and W/kg emission. These rats were absorbing tens of thousands of times more energy than you would experience holding a phone directly to your head.
- mclehman 8y agoI believe you added an extra "/kg" on emission.
- ummonk 8y agoNo, he's pointing out that even (watts emitted)/(kgs of body region that is expected to absorb) is an over-estimate of watt/kg absorption.
- hwillis 8y agoNope- It's a technical elision. An 80 kg man in an open field next to a 80 W transmitter is exposed to 1 W/kg, and absorbs microwatts/kg. Ionizing radiation is treated much more rigorously, and thickness and and frontal area are used to calculate the actual dosage, but for EM sources the wattage/kg is not unusual as a metric. It's useful for nearby transmitters, where exposure is focused on a single part of the body, vs simply being exposed to 80 watts of incident power.
- IshKebab 8y ago> An 80 kg man in an open field next to a 80 W transmitter is exposed to 1 W/kg, and absorbs microwatts/kg. That's not at all how it works. https://en.wikipedia.org/wiki/Specific_absorption_rate#Mobile_phone_SAR_testing https://en.wikipedia.org/wiki/Specific_absorption_rate#Mobil...