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Rapid measurement of 241Pu activity at environmental levels using low-level liquid scintillation analysis
Authors:Jung-Suk Oh  Phillip E Warwick  Ian W Croudace  Sang-Han Lee
Institution:1. Ionising Radiation Centre, Korea Research Institute of Standards & Science, 267 Gajeong-ro, Yuseong-gu, Taejon, 305-340, Republic of Korea
2. GAU-Radioanalytical, National Oceanography Centre, University of Southampton, Southampton, SO14 3ZH, UK
Abstract:A straightforward and rapid method has been developed for the determination of 241Pu activities. Pu is chemically separated from the sample, purified and electrodeposited to produce a source for alpha spectrometric determination of 238Pu and 239,240Pu. Pu is stripped from the disc with concentrated nitric acid and extracted into tri-octylphosphine oxide (TOPO)/toluene. The organic extract is then mixed directly with commercial liquid scintillation cocktail without any further purification procedures and the sample counted on a Wallac 1220 Quantulus liquid scintillation counter (LSC). 241Pu activity is estimated via the 242Pu yield monitor acquired by alpha spectrometry measurement. Experimental results for the performance testing of a low-level liquid scintillation spectrometer and the data for the evaluation of the method using standard reference materials are presented.
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