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Abstract

Neutron measurements were performed with a new high performance neutron coincidence counter (HLNCC-II) on 9 high burn-up plutonium samples. The mass range of the high burn-up PuO-2 samples was 1.5 - 2.8 kg plutonium. In addition measurements were performed on a number of medium and low burn-up PuO-2 samples as well as uranium - plutonium mixtures. Measured total rates in excess of 400,000 counts/s were observed. A multiplication corrected calibration curve was established for PuO-2 in the mass range up to 2.8 kg plutonium (240-Pu effective mass up to 1 kg). It was shown that the multiplication correction performed well provided the moisture content of the samples was less than a few thousand p.p.m. Experience, to date, indicates, that the HLNCC-II system, including the multiplication correction, is appropriate for measuring the 240-Pu effective mass over a large range of sample sizes.

Additional information

Authors: SMITH B G R, CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO (USA);BELGONUCLEAIRE, DESSEL (BELGIUM);MENLOVE H, CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO (USA);BELGONUCLEAIRE, DESSEL (BELGIUM);KRICK M S, CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO (USA);BELGONUCLEAIRE, DESSEL (BELGIUM);INGELS R CEC LUXEMBOURG, CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO (USA);BELGONUCLEAIRE, DESSEL (BELGIUM);LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO (USA), CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO (USA);BELGONUCLEAIRE, DESSEL (BELGIUM);BELGONUCLEAIRE, DESSEL (BELGIUM), CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO (USA);BELGONUCLEAIRE, DESSEL (BELGIUM)
Bibliographic Reference: 7TH ESARDA ANNUAL SYMPOSIUM ON SAFEGUARDS AND NUCLEAR MATERIAL MANAGEMENT, LIEGE (BELGIUM), MAY 21-23, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32233 ORA
Availability: Can be ordered online
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