Year
1986
Abstract
The differential die away time method has become an attractive method for a-waste assay in the 100 n Ci/g region. However the accuracy of this method is influenced by several parameters. To quantify these effects calibration measurements were performed in 200 1 waste drums. The paper describes the setup, the calibration program and the results in terms of accuracy and sensitivitiy. Moreover results of optimization studies are discussed. The applicability to intermediate and high level a-waste is discussed and a comparison to passive neutron counting is given.