A diode suitable for use at microwave frequencies. For example
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Ah, phew. I thought that didn't sound right! Ok, that makes sense.
Edit:
Thanks @jremington for the link!
When cell phones had antennas, you could buy an RF powered LED dongle that attached to the antenna and would flash when you receive a call. Probably drove some cellular engineers to early retirement.
lol, I'm completely inexperienced with wireless, but it sounds like that would do just that! That's pretty slick though.
I had a desktop toy, it would flash like that if the phone was a few feet away. It was battery powered though.
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This thread has come a long way from reading the total radiation from a microwave generation device.
Yeah 
. I had high goals...
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That sort of stuff is done as university lab experiments.
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Not to open a can of worms 
but if you could "read the total amount of radiation," how would you use the information?
You say it is for "health purposes," so would you use it to make health-related decisions? If so, how? Would you follow some science-based protocol? Is there such a document?
Or would it really be more of a "geez whiz, that's interesting" sort of thing?
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Yeah, it'd be more like that. Kind of just an interesting project.
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Do this.
Using An LED As A Simple RF Detector | Hackaday
Be happy.
Added:
For a better understanding of electronics and diode applications, a short read:
Types of diodes | applications,functions,types of diodes (rfwireless-world.com)
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What most radios do when they want do 'deal' with the signal is down convert a 'block' of signals to a lower frequency where they are easier to deal with...
Hookup wire is generally not a problem, but over about 100mHz it starts to become an antenna, inductor and resistance or all the above sometimes leading to an RL network from a simple wire...
Here's a 25gHz module, notice the 'filter' at the bottom and the 'mixer' to the right of the filter.
The filter is an arrangement of inductors that are the filter... the mixer also uses some type of tap for it's feed...
It's incredibly tough to build these by hand and it's very tough to trouble shoot them without equipment that's fast enough for you to see something... usually costing lot of $$$...
Best suggestion is looking at your phone...
Even better is to become interested in amateur radio and meet your Elmer .. 
But if it's health concerns have fun, it's not a problem with emf as long as it's below uv light, I think is the threshold... most of these signal are in micro watts range... anyway the whole planet runs on emf... sunlight isn't hot it's the molecules being excited by the emf field ...
Are you going to make this compatible with 6G? 
EDIT -- forgot photo of board 
Take care... good luck..
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