ML19312D958

Ack Receipt of 800330 to R Deyoung.Forwards Rough Guide to Relative Toxicity of Various Radionuclides Included in App B to 10CFR20, Concentrations in Air & Water Above Natural Background

ML19312D958
Person / Time
Issue date:	05/14/1980
From:	Ross D Office of Nuclear Reactor Regulation
To:	Dement J DEMENT LABORATORIES
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ML19312D959	List: ML19312D958 ML19312D960
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NUDOCS 8006020594
Download: ML19312D958 (9)

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%9.....,o MAY 141980 Mr. Jack Dement, D. Sc.

Dement Laboratories 4847 S*. E. Division Street Portland, Oregon 97206

Dear Dr. Dement:

1 Thank you for your letter of March 30, 1980, addressed to Mr. Richard DeYoung.

Mr. DeYoung has recently transferred to another part of our organization and I have been asked to reply for him. By now you should have re, eived the additional information that we requested be sent to you from Dr. Certel of the Department of Energy. We hope that you found this information helpful.

In regard to the toxicity of reactor-derived, short-lived agents (radionuclides) and their potential use as radiological weapons, please be advised that the Nuclear Regulatory Commission (NRC) does not have responsibility for national defense relat-ed matters. Nor are we involved in the establishment of treaties or arms control.

The NRC licenses cmmercial nuclear power reactors and non-defense related research and test reactors. The predominant amounts of short-lived radionuclides produced by fission in these reactors remain in the fuel rods a-i decay to stable elements.

Spent reactor fuel from NRC licensed reactors is now stsed indefinitely and is not reprocessed to recover fissionable material. Even if spent fuel were reprocessed, the amount of short-lived radionuclides in the fuel rods at the time of reproces-sing would be essentially zero since the spent fuel is stored before reprocessing for the express purpose of allowing time for short-lived fission product decay.

A rough guide to the relative toxicity of various radionuclides can be found in Appendix B to 10 CFR Part 20, " Concentrations in Air and Water Above Natural Back-ground," a copy of which is enclosed. The table found in this appendix lists the maximum concentration of each radionuclide allowed in air and water for both occupa-tional workers and the general public. The lower the allowed concentration, the greater the biological risk if inhaled or ingested, when comparing equal concentra-tions of radionuclide.

I hope you will find this infomation helpful.

Sincerely,

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Denwood F. Ross, Director Division of Systems Integration Office of Nuclear Reactor Regulation

Enclosure:

Appendix B,10 CFR Part 20 THIS DOCUMENT CONTAINS P00R QUAUTY PAGES 8006020 6.fA/

Jack Dement, D. Sc.

- MAY 141980 DISTRIBUTION:

H. Denton E. Case H. Berkow W. Russell R. Mattson D. Eisenhut W. Kreger W. Gammill R. Bangart G. Ertter (NRR 3951)

M. Groff L. Kriesel-C. Paul NRC PDR Central File NRR Reading File ETSB Reading File ETSB Subject File 3.3 i

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PART 20 o STANDARDS FOR PROTECTION AGAINST RADIATION 1

Nott TO Ah PF.NDIX B

'~ 3. If any cf 12.e cocditlets spee *ed belour l

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• - s la an* case where there e a misture in mar e are tr.et, the correspcmding values spe:: Sed

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a. If the identity et each radtonuc!!de la s if the edestne and enemraties cf each rad.cnu' Ge misture ia known but th concentradon ehde en the estature are anaa n. the bmning s elves thauld le de-toed as fofl**% IMertame fur each re.

of crae or more of the rhdicout:1 des la the T d osuchde se tte rastore.the ratu.teteern the tiventite e tnisture is not know'n. the cc.ncet* ation

$ rw.ans in the stsiure end the ben other ne mer'$1:mit for the mtzture is the !!mit spec!!ed

- 1.shed in Ariter.ts 8 sur the *wirme reesonuchde e hen = In Appendia "B" for the radionuellde in the not in a mmuse. The aure er such rssies for all the g

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=

M PC*a. are M Pf a. and M Pf a, and M PCe restee.

that certain radlonuc!! des speci$ed in Ap.

toely, them the mnrestratenres shall te hmned so that tbr fallaming ressrsonshtp estens:

pendiX "B* are not pretent in the Clzture, e

the cCacentration 1121t for the m!2ture is

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Ce Ce the lowest concentration !!mit spec: fed la e

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=e"

4. If a mixt'are of radionuclides consists of R urtalum and its daughters in ore dust prior o to chem! cal separation of the ura.njum frohn i

I the ore, the values spec;Eed below may be

( tadium-226,Instead of those from parapaphs used for uranium and its daughters througan a

ir, 1,2, or 3 above.

s.

I

a. For purposes of Table I, Col.1-IX10-**

R pct /ml gross alpha actietty; or 5x104 sC1/

R ml catural spa.ctum: or '28 micrograms per N cubic meter of str natural utar.luza, c

b. For purposes of %ble II, Col 1-3 X 1048

• pCLml stoss alpha activity; or 2x10-18.pC1/

$ m3 natural urantum;.or 3 micrograms per L cubic meter of air estural uranium.

~

5. For purposes of this cote, a radlo.

nuc!!de may be cocstdered as not present in a mixture if (a) the ratto of the concentra.

tion of that radionuclide in the mixture

.(Cs). to the concentration limit for that

i. s

$ radionuclide spec 1 Sed in Table II of Ap.

= pendiz.B (WPC ) does not exceed he

'(1.e..

g ) and (b) the etam of such 2ation for all the radfor.uc!! des conaldered as not present in the mixture does not esceed

.ca en

_ * (i.e. ggg + pyc7,+..... 50 4

April 28,1977 20-16 a-

.