MEASUREMENT OF THE ACTIVITY CONCENTRATION OF A SOLUTION OF SE-75

Authors
RATEL G
Citation
G. Ratel, MEASUREMENT OF THE ACTIVITY CONCENTRATION OF A SOLUTION OF SE-75, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 339(1-2), 1994, pp. 408-413
Citations number
6
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
339
Issue
1-2
Year of publication
1994
Pages
408 - 413
Database
ISI
SICI code
0168-9002(1994)339:1-2<408:MOTACO>2.0.ZU;2-8
Abstract
The activity concentration of a solution of Se-75 has been measured at BIPM as part of an international comparison organised on behalf of Se ction II of the CCEMRI. Two methods were used: the traditional 4 pi be ta-gamma coincidence technique and the selective sampling method. The results agree, however the values have to be corrected because of the presence of a long-lived intermediate state at 304 keV. The beta spect rum has a complicated structure, and therefore the extrapolation to a beta efficiency of 1 is not straightforward. Different threshold setti ngs are discussed for performing the extrapolation. The measured corre ction is compared with the values obtained by a calculation which uses tabulated data.