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10CFR20 mistake?


A student in my HP class pointed out something in 10CFR20 that has until

now escaped my notice.

20.2202 (a)(1)(iii) "A shallow-dose equivalent to the skin or extremities

of 250 rads(2.5 Gy)..."

Note the units used here for shallow-dose equivalent. It is the same in

earlier editions of 10CFR20. In (b)(1)(iii) the units are in rems (Sv). 

Do you suppose there is a reason behind the difference in units, or is it

just another governmental boo-boo? 

Jack Couch

Bloomsburg University


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