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Abstract

The improvement in detection limits for low and high activity samples measured with the Compton-suppression gamma-spectrometer installed at the Institute for Transuranium Elements (ITU) for environmental monitoring of radioactivity, as well as nuclear safeguards, is discussed. The advantage of using two parallel acquisition lines for simultaneous measurement with and without Compton-event suppression is outlined with respect to cascade and non-cascade gamma-emitters. The background reduction by Compton-event suppression made it possible to detect small peaks, which otherwise would not have been found in a conventional spectrum. In Compton-event suppression mode, the detection limit for {137}Cs was improved by a factor of about 3, for {241}Am we found a factor of 1.2 both in high and low active samples. The measurements of environmental reference samples showed good agreement with certified values in both acquisition modes. The application of this instrument for the determination of fission products in smear samples is described. In particular, for nuclides like {54}Mn, {125}Sb and {144}Ce, an improvement in the detection limits by a factor of 1.6�2.4 was obtained.

Additional information

Authors: PEERANI P, European Commission, Joint Research Centre, Institute for Systems, Informatics and Safety, Ispra (IT);CARBOL P, European Commission, Joint Research Centre, Institute for Transuranium Emements, Karlsruhe (DE);HRNECK E, European Commission, Joint Research Centre, Institute for Transuranium Emements, Karlsruhe (DE);BETTI M, European Commission, Joint Research Centre, Institute for Transuranium Emements, Karlsruhe (DE)
Bibliographic Reference: An article published in: Nuclear Instruments and Methods in Physics Research - Section A, Volume 482, Issues 1-2, 11 April 2002, pp.42-50
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1016/S0168-9002(01)01677-1
Record Number: 200215688 / Last updated on: 2002-12-23
Category: PUBLICATION
Original language: en
Available languages: en