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Re: The human body
Posted by FCC (Ret) on August 7, 2018, 14:18:13, in reply to "The human body
Re: the power of naval radars...fire control and air search radars often measured in megawatts. Definitely hazardous. Always heed the "RADHAZ" warning signs.
absorbs radio waves and converts them into heat (the typical impedance for a human body is about 360 Ohms). Damage depends on power (watts) and frequency. 50 watts is the lower limit below which radiation is not a factor. 2,000 watts and higher can be a serious problem. Also, the human body is resonant at several frequencies, which increases the impact. (You would make a good antenna for channel 6) Higher frequencies = higher energy.
"Ionizing radiation" which has enough energy to knock off electrons is the worst, as it can cause severe burns (acute) or genetic damage (cancer). But this would be up in the gamma, beta or x-ray spectrum.
At typical radio frequencies, the concern is internal heating. Cells start to die at about 107. If the blood can't carry away the heat fast enough, you could get organ damage. Microwaves would heat you so fast your organs would expand and boil, for example.
You could also get a nasty shock if you touched the equipment.
I don't know how many watts shipboard radios/radars put out, but I can see it being at least as much of a problem as it is for HAM radio operators.
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