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> Dose equivalent" is a medical measure of the risk caused by that "Dose absorbed". That's measured in Greys (with an E, not an A).

Neither the NRC nor the EPA nor the NIH nor the NRC seems to know about the "Grey". Everyone in the US seems to know about the "Gray" (abbreviated as "Gy"), which is used to measure dose and doesn't factor in biological harm.

What country uses the "Grey" unit? What's the abbreviation of the "Grey" unit? Would you point to credible sources for the answers to those two questions?

> "Dose equivalent" goes farther and is meant to calculate medical risk to a living person.

Yes. That's biological harm. Getting hit on the skin from outside your body with a large amount of alpha radiation is far less harmful than getting hit with the same amount of gamma radiation. AFAICT, "dose equivalent" is measured in Sv or rems.

If you can demonstrate a credible source for the "Grey" unit, then I can dismiss this as a time-wasting misunderstanding, but I've yet to see any reference to a "Grey" unit of radiation exposure.

> Its literally lower than the natural background radiation [at some places on earth]...

Yep. ALARA is a scourge. And I -too- have read Admiral Whatshisface's open letter from the 1980's or 1990's or whenever about how the regulation of the civilian nuclear energy program is batshit nuts by way of being negligently overcautious.



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