[ RadSafe ] Fwd: Basis for Sealed Source Leak Test Detection Level

Jimmy Rolph rolph.chp at gmail.com
Sat Jun 18 15:27:31 CDT 2016

Our site's technical basis document refers to 10 CFR70.39(c) as the basis,
the intake limit for Pu-239.

On Fri, Jun 17, 2016 at 8:01 PM, Chris Alston <achris1999 at gmail.com> wrote:

> Folks
> It's not an LLD per se, it's an action level (threshold, if you prefer).
> The NRC's rule is that, when you find 0.005 uCi, or more, leaking from a
> sealed source, you take it out of service (like, then), repair or dispose
> of it, and inform them (5-day rule??).  So, if you cannot detect at least
> 0.005 uCi, you have a problem, because you could have a leaker, by
> regulatory definition, and not know it.  Of course, as some of you have
> said, it's easy to get LLD's much lower than that, even with, say, a
> pancake G-M tube.
> Now, what the rationale for the original value was, I don't know.  Mayhap
> we should page Paul Frame, or a similar historical guru.
> Cheers
> ca
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