The NRC is aware of only 6 hot particle doses that have exceeded the 50 Rem skin dose limit, out of more than 15,000 documented cases.
>>> jack bell <bellstar@erols.com> 11/04 3:50 AM >>>
William V Lipton wrote:
> The issue has become moot since the new 10 CFR 20 took effect. Under the
> old 10 CFR 20, the dose limit to the skin was 7.5 rems per calendar
> quarter. There was a good chance of exceeding this dose from a hot
> particle. A typical "fuel flea" could give you this dose through your
> protective clothing in less than an hour. Thus, even though the risk from
> exposure to a small surface area is minimal, this generated a reportable
> event. Under the new 10 CFR 20, the skin dose limit is 50 rems per year.
> This is unlikely to be exceeded by a hot particle exposure.
>
William,
Not so. The dose rate at a hot particle can be extremely high.
Jack Bell, bellstar@erols.com
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