ML20151M921

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Responds to 880621 Request for Addl Info Re Enrichment of Naturally Occurring radioisotopes.Te-123 Will Be Enriching Approx 60 G to About 50%
ML20151M921
Person / Time
Site: 05000000, 05000603, 05000604
Issue date: 07/20/1988
From: Smelser J
ALL CHEMICAL ISOTOPE ENRICHMENT, INC.
To: Thompson H
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM), NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
24526, NUDOCS 8808080038
Download: ML20151M921 (3)


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JUL251983 NWSS )D July 20, 1988 /s %en MAR SECDON 47)g v) 9, Docm ctEn ,

Docket No's: 50-603 D a I~

50-604 U. S. Nuclear Re'gulatory Commission Document Control Desk Office Nuclear Material Safety & Safeguards Washington, DC 20555 Attention: Mr. Hugh L. Thompson, Jr.

6A-4 NMSS Locket Materials Gentlemen:

In response to Mr. A. Thomas Clark Jr.'s letter dated June 21, 1988, . requesting additional information on enrichment of naturally occurring radioisotopes we advise as follows:

1. For carbon-14 enrichment the highest concentration would be in dimethylzinc feedstock material.

Approximately 25% of this compound is carbon. If it is assumed that carbon-14 is present with a specific activity level of 5 picocuries per gram and 4Kg are enric,ged to 100% the resulting activity would be SX10 C1, an amount 200 times lower than one microcurie. Clearly, carbon-14 enrichment is totally inconsequential. A five picocurie per gram concentration corresponds to the highest levels found naturally, however, the alkyd feedstocks used for production are all petroleum-derived and will have specific activity orders of magnitude lower than 5 picocuries/ gram.

2. For tellurium-123 AlChemIE will be enriching approximately 60 grams to about 50%. With a specific activity level of 0.2 X 10 C1/Kg, 60 grams _ pf this product would have an activity of 6 x 10 C1, an amount 167 time lower than one r.iicrocu rie . Clearly, tellurium-123 enrichment is of no consequence. The assumed 60 gram amount of product is excessive with respect to tha inventory on site at any given moment.

8808080038 880720 fhY PDR ADOCK 05000603 ' -O A PDC Pine Ridge Office Jork Suite %)2-8 702 lifinois Ave.. Ook Ridge, TN 3?830 (615) 482-0029 gg

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  • j Nuclear Regulatory Commission July 20, 1988 Page 2
3. For ygadmium-113, the specific activity is 340 X 10 Ci/Kg. If it is assumed that all of the enriched product, about 120 grams, is cadmium-113, i then the activity would be 40.8 picocuries, an smount 25,000 times lower than one microcurie. Clearly, cadmium-113 enrichment is totally inconsequential.

Again, the assumed product amount of 120 grams of 100%

cadmium-113 is far greater than any inventory there will on-site at any given moment.

We hope these calculations have now removed any concern whatsoever with respect to the possible consequences of enriching any of these isotopes.

Sincerely, M CHEMIE qINC.

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{ M/ &fd4 Jo n H. Smelser, Jr.

Chief Executive Officer JHS/WAP/bc cc: Dr. A. Thomas Clark, Jr./NRC Mr. Charles P. West, TDHE l

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