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Results are presented relating to the use of neutron multiplicity counters technique for bulk plutonium samples measurements. The set of plutonium oxide samples from PERLA laboratory in the range of plutonium mass from 7 g to 2.5 kg was measured with a standard detector head AWCC in passive mode combined with an electronic device, The pulse interval analyzer, developed at JRC (Ispra). The measured values of signal singlets, doublets and triplets were analysed on the base of two models, developed at JRC between 1987 and 1992 for the dead-time effect correction and for the estimation of fission rate, multiplication and (alpha,n) rate. The dead-time was determined with non-calibrated californium and americium sources. The study of the influence of the different sources of errors (dead-time, counting statistics, additional information about sample) on the plutonium mass evaluation has been performed. The comparison of plutonium masses measured with shift register technique and multiplicity counting technique is presented.

Additional information

Authors: VOCINO V, JRC Ispra (IT);GUARDINI S, JRC Ispra (IT);JAIME R, JRC Ispra (IT);MAIOROV V, V G Khlopin Radium Institute, St Petersburg (RU)
Bibliographic Reference: Paper presented: 19th Annual Symposium on Safeguards (ESARDA), May 13-15, 1997
Availability: Available from (1) as paper EN 40560 ORA
Record Number: 199711088 / Last updated on: 1997-09-16
Original language: en
Available languages: en