Reference, Questions and Help > Lessons Learned
how hot is clean?
DDD:
You also have to consider inaccessable areas such as inbedded piping, If these areas are grouted you can get relief from the agencies to leave conciderably higher levels.
alphadude:
You must look at the contributions- ground water, soil and structures as an integrated component. 25 mr/yr is a good limit. This must be divided up among the three components, if applicable, and there ya go. Its always good to establish an ALARA limit like 10 mr/yr.
Analysis of the Hard to Detects, then scale to Cs-137 or some nuclide you can readily detect and go from there. Pipe may be several thousand dpm/100cm2 before 1 mr/yr is reached, but that depends on the mix. Am-241 and the likes can lower your easy to detect limit. Dose based is always better than contamination based limits- Three Building Project was a good example of how much it cost...
alphadude:
Yea seems to be some confusion, the LTP vs NRC license requirements are usually two different things. free release vs FSS and so on. It all comes down to agreements. "clean" means no detectable in general. not really related to FSS, since we have Cs-137 and Sr-90 in the background and this must be integrated into the FSS when applicable.
MrHazmat:
Hey DOT say's 22 dpm/cm2 Alpha , 220 dpm/cm2 Beta-Gamma , and 0.5 mRem/hr is clean :D
radgal:
That's for TRU. Depleted Uranium the numbers are different much higher,same is true but even more so for H3. As others have stated above it depends on the isotope.
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