If the microwave oven was less than one inch in size one could
say the power should drop as the square of the distance, so 10x farther
means 100x lower.
In reality it's going to depend on where you measure, especially on
whether there is a line of sight through the window to the feed horn
where the microwaves come out. If so the power will probably decay
as the square of the distance from the inside of the feed horn.
Thus from 2cm outside the door to 20cm outside the power will
probably only drop by a factor of 4 or so.
In other directions the field will be less but I can't predict how much.
Hope that helps
Bill
On Nov 28, 2007 1:17 PM, sandimaurer <
[hidden email]> wrote:
>
> My Math Question:
>
> If the FDA sets the limit of 5mW/cm2 at two inches from the microwave
> oven door what would be the exposure level at 20 inches if it is one
> one-hundreth of value. ? How about at 4 feet? 10 ft?
>
> thanks. And thanks Charles for your last answer.: )
>
> From the FDA website:
> "A Federal standard limits the amount of microwaves that can leak from
> an oven throughout its lifetime to 5 milliwatts (mW) of microwave
> radiation per square centimeter at approximately 2 inches from the
> oven surface. This limit is far below the level known to harm people.
> Microwave energy also decreases dramatically as you move away from the
> source of radiation. A measurement made 20 inches from an oven would
> be approximately one one-hundredth of value measured at 2 inches."
>
>
>
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