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RE: Californium
Recently I had to do some digging, some of which involved Californium source
output. Here it is for whatever it is worth
Californium - 252
Decay Modes
Alpha Emission
Yield - 0.96
Half- Life - 2.62 y
Energy - all alphas are greater than 5.98 MeV
Spontaneous Fission
Yield - 0.0309
Half - Life - 85.5 y
Neutron / fission - 3.74
Fission / sec / microgram - 6.15 E 5
Neutron / sec/ microgram - 2.3 E 6
"Effective" Half Life
2.54 years
Dose and Dose Equivalent Rates from 1 gram
Neutrons 1.97 E 7 n / cm**2 /s
280 rad / h
2400 rem / h
Photons 1.1E 8 Photons/ cm**2 / h
140 rad / h
140 rem / h
Total 2540 rem / h / g
References
General
Anon, "Nuclear Properties", in Cf-252, Uses and Market Potential, E.I.Dupont de
Nemours and Company, Aiken, SC, 1968, p.13.
S. F. Mughabghab and D. I. Garber, " Neutron Cross Sections: Volume 1, Resonance
Parameters", USAEC Report BNL-325, 3rd. Edn, June 1973.
D. C. Stewart, " Data for Radioactive Waste Management and Nuclear
Applications", Wiley Interscience, New York, 1985.
International Commission on Radiation Protection, Committee 3, "Data for
Protection Against Ionizing Radiation, Suppl. To ICRP Pub. 15", ICRP Publication
21, Pergamon Press, Oxford, 1975.
Specific
J. Blachat, P. Cavallini, A. Ferrieu, and R. Louis, Rendements de Fission
Cumulatifs de 252Cf",J. Radioanal. Chem., 26, 107-125 (1975).
R. M. Harbour, M. Eichor, and D. E. Troutner, "Mass Yields from the Spontaneous
Fission of 252Cf", Radiochim. Acta., 15, 146-150 (1971).
W. E. Nervak "Spontaneous Fission Yields of 252Cf", Physical Rev., 119,
1685-1690 (1960).
Regis A. Greenwood, C H P
ragreenwood@FirstEnergycorp.com
OR
greenwood@physicist.net
419-321-8437
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