[ RadSafe ] Shipment of an instrument with small quantity of uranium enriched to 50% in U-235.
jelynch at stny.rr.com
Wed Sep 29 20:39:41 CDT 2010
DOT shipment of instrument containing radionuclide
I am questing insight into the A1 and A2 values for shipping an
instrument which contains a small amount of enriched uranium [normal
form]. The uranium enrichment is 50% in U-235 (a few hundred micrograms).
49CFR173.434 Activity-mass relationships for uranium and natural
thorium. Various enrichments of Uranium in U-235 are listed, up to 95%
49CFR173.425 is Table 4: Table of activity limits---excepted quantities
and articles. Fractional multiples of A1 or A2.
49CFR173.435 Table of A1 and A2 values for various radionuclides. This
table does not address Uranium enriched in U-235 greater than 20%.
My question is: how are the A1 and A2 values determined for Uranium
enriched to 50%? Would they have to be calculated per methodology in
Please copy jqpublic62 at hotmail.com on responses.
ASIDE: In the late 1990's the A1 and A2 values for enriched uranium (>
20%) was included in Table 49CFR173.435. This > 20% enriched entry is
not in the current 49CFR173.435 table (seems to have been deleted in 2004).
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