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Characterization of 244Cm neutron sources.
Appl Radiat Isot. 2020 Sep; 163:109225.AR

Abstract

There is a need to find a replacement for the 252Cf sources currently used in Standards-based performance testing of neutron instrumentation. This is a result of its relatively short half-life, concerns about future availability and recent increases in cost. A potential replacement source, 244Cm is evaluated in this study where two commercially available sources have been acquired and their neutron emission spectra measured using a pair of spectrometers. Both instruments showed the 244Cm spontaneous neutron spectrum to be fully consistent with a MCNP6®-calculated spectrum using published Watt fission parameters for 244Cm. In addition, the emission rate of the weaker 244Cm source was established through a direct count rate comparison against a calibrated and similarly encapsulated 252Cf source. The 244Cm source emission rate was found to be in excellent agreement with value stated on the manufacturer's source certificate. It is concluded that 244Cm would be an ideal replacement for 252Cf based on its longer half-life (18.1 y) and its essentially identical neutron emission spectrum. In addition, 244Cm sources are commercially available at reasonable cost.

Authors+Show Affiliations

Lawrence Livermore National Laboratory, PO Box 808, L-186, Livermore, CA, 94550, USA. Electronic address: radev1@llnl.gov.Los Alamos National Laboratory, PO Box 1663, MS J-573, Los Alamos, NM, 87545, USA. Electronic address: tmclean@lanl.gov.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32561061

Citation

Radev, Radoslav, and Thomas D. McLean. "Characterization of 244Cm Neutron Sources." Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine, vol. 163, 2020, p. 109225.
Radev R, McLean TD. Characterization of 244Cm neutron sources. Appl Radiat Isot. 2020;163:109225.
Radev, R., & McLean, T. D. (2020). Characterization of 244Cm neutron sources. Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine, 163, 109225. https://doi.org/10.1016/j.apradiso.2020.109225
Radev R, McLean TD. Characterization of 244Cm Neutron Sources. Appl Radiat Isot. 2020;163:109225. PubMed PMID: 32561061.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characterization of 244Cm neutron sources. AU - Radev,Radoslav, AU - McLean,Thomas D, Y1 - 2020/05/20/ PY - 2020/03/09/received PY - 2020/05/10/revised PY - 2020/05/11/accepted PY - 2020/6/21/entrez PY - 2020/6/21/pubmed PY - 2020/6/21/medline KW - 244Cm KW - 252Cf KW - MCNP KW - Neutron sources KW - Neutron spectroscopy KW - Neutrons KW - Performance testing SP - 109225 EP - 109225 JF - Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine JO - Appl Radiat Isot VL - 163 N2 - There is a need to find a replacement for the 252Cf sources currently used in Standards-based performance testing of neutron instrumentation. This is a result of its relatively short half-life, concerns about future availability and recent increases in cost. A potential replacement source, 244Cm is evaluated in this study where two commercially available sources have been acquired and their neutron emission spectra measured using a pair of spectrometers. Both instruments showed the 244Cm spontaneous neutron spectrum to be fully consistent with a MCNP6®-calculated spectrum using published Watt fission parameters for 244Cm. In addition, the emission rate of the weaker 244Cm source was established through a direct count rate comparison against a calibrated and similarly encapsulated 252Cf source. The 244Cm source emission rate was found to be in excellent agreement with value stated on the manufacturer's source certificate. It is concluded that 244Cm would be an ideal replacement for 252Cf based on its longer half-life (18.1 y) and its essentially identical neutron emission spectrum. In addition, 244Cm sources are commercially available at reasonable cost. SN - 1872-9800 UR - https://www.unboundmedicine.com/medline/citation/32561061/Characterization_of_244Cm_neutron_sources L2 - https://linkinghub.elsevier.com/retrieve/pii/S0969-8043(20)30354-7 DB - PRIME DP - Unbound Medicine ER -
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