ML19323B337
| ML19323B337 | |
| Person / Time | |
|---|---|
| Issue date: | 02/23/1978 |
| From: | Ryan Alexander, Mcguire S NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | |
| References | |
| RTR-REGGD-08.022, RTR-REGGD-8.022 NUDOCS 8005120252 | |
| Download: ML19323B337 (4) | |
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' ' F ~ SOLUBILITY OF URANIUM ' COMP 00?'DS I;. !
3(N AT -URNIIUM, i:1 ILLS y
I Robert E. Alexander 2 S'tephen A. McGuire A
Office of Standards Development U. S. Nuclear Regulatory Commission February 23, 1978~
~'
i The solubility of yellowcake (and the radioactive isotopes in uranium ~
f ore and tailings) is currently being measured under contract to the'NRC.
7-by Battelle-Pacific !!orthwest Laboratories. Solubility is being measured in simulated lung fluid at body temperature using a pass-by method for
,l yellowcake and a batch-method for ore samples.
The discussion belcw is taken frem Cattelle's first progress report to the NRC.
[
Figure i shcus the solubility for an-ore dust sample collected from the air in the crushing olant of a New Mexico mill.
Note that uranium shows a surprisingly short 35-day dissolution half-life. On the other hand thorium-230 and lead-210 do not show measurable dissolution. About 20% of the radium-226 appears to dissolve rapidly, but the remaining 805 shows little solubility.
According to the ICRP Task Force Lung Mcdel uranium would be a class il ccmpound, thorium-230 and lead-210 would be class Y,'nd radium-225 would be 20% class II and 80% class Y.
a Figure 2 shows solubility of yellcwcake from three mills. The Exxon 4
i sample was green-black, the, Kerr McGee sample was orange-yellow, and the Anaconda sample was green-yellow.
Dissolution half-lives of 8.5 days, 13.7 deys, and 24 days were measured.
THIS DOCUMENT CONTAINS P00R QUAUTY PAGES 1
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I JAn analy~ sis completed by R.1E. Alexander of the NRC Office of Standards
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I Developr.cnt indicates that.for any natural uranium compound with a half-life 3.
of 50 days or less in the lung, chemical toxicity to the kidney is the l
critical consideration. This analysis, alcng with the dissolution half-life results obtained at Battelle-Pacific Northwest Laboratories, have led the HRC staff to take the position that yellowcake should _be considered soluble with respect to ccmpliance with S'20.103 of 10 CFR Part.20.
It is possible that a similar position will be taken later for uranium ora dust, depending l O.
I on future results obtained for the dissolution half-life.
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i Ackncwledgements: The experimental results were obtained at Battelle-l Pacific Northwest Laboratories under the direction of Dr. Donald Kalkwarf.
Al Breslin, A'ndreas George, and Ronald Knuth of ERDA's Envircnmental Iteasurements 1.aboratory collected the ore dust sample, and Mr. William 1
Shelley of Kerr-McGee supplied the yellowcake samples.
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