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Re: 10CFR20 mistake?
> 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?
This is not an ewrror. It;s simply a degree of the exposure and the
definition, as defined below:
§20.1004 Units of radiation dose.
(a) Definitions. As used in this part, the units of radiation dose
are:
Gray (Gy) is the SI unit of absorbed dose. One gray is equal to an
absorbed dose of 1 Joule/kilogram (100 rads).
Rad is the special unit of absorbed dose. One rad is equal to an
absorbed dose of 100 ergs/gram or 0.01 joule/kilogram (0.01 gray).
Rem is the special unit of any of the quantities expressed as dose
equivalent. The dose equivalent in rems is equal to the absorbed dose
in rads multiplied by the quality factor (1 rem=0.01 sievert).
------------------------------------------------------------------------
Sandy Perle Tel:(714) 545-0100 / (800) 548-5100
Director, Technical Extension 2306
ICN Worldwide Dosimetry Service Fax:(714) 668-3149
ICN Pharmaceuticals, Inc. E-Mail: sandyfl@earthlink.net
ICN Plaza, 3300 Hyland Avenue E-Mail: sperle@icnpharm.com
Costa Mesa, CA 92626
Personal Website: http://sandyfl.nukeworker.net
ICN Worldwide Dosimetry Website: http://www.dosimetry.com
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