Crossword Genius

Radiation unit (3)

Ross

I believe the answer is:

rem

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">radiation unit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for rem that I've seen before include "Phase in sleep" , "Sleep stage when dreaming occurs" , "radiation unit" .)

I've seen this clue in the Penny Press.
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