Primary activity measurements with 4πγ NaI(Tl) counting and Monte Carlo calculated efficiencies

Nedjadi, Youcef (Institut de Radiophysique Appliquée, Lausanne, Switzerland) ; Spring, Philippe (Institut de Radiophysique Appliquée, Lausanne, Switzerland) ; Bailat, Claude (Institut de Radiophysique Appliquée, Lausanne, Switzerland) ; Decombaz, Marc (Institut de Radiophysique Appliquée, Lausanne, Switzerland) ; Triscone, Gilles (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Gostely, Jean-Jacques (Institut de Radiophysique Appliquée, Lausanne, Switzerland) ; Laedermann, Jean-Pascal (Institut de Radiophysique Appliquée, Lausanne, Switzerland) ; Bochud, François O. (Institut de Radiophysique Appliquée, Lausanne, Switzerland)

The radioactive concentrations of 18F, 88Y and 152Eu solutions and the activity of 222Rn gas ampoules are measured using a primary method involving 4πγ NaI(Tl) integral counting with a well-type NaI(Tl) detector and efficiencies computed by Monte Carlo simulations. The simulations use the GEANT code coupled with a routine (sch2for), which generates randomly the decay paths and emissions depending on the decay scheme parameters. The resulting radioactive concentrations of 88Y, 152Eu and 18F are found to agree with those measured with other primary measurement methods, such as 4π (β, e, X)-γ coincidence counting or liquid scintillation counting. Results of the determination of the activity of 222Rn gas ampoules by this method also match the results of an absolute standardisation technique in which radon is condensed onto a cold surface and its α-emissions are detected through an accurately specified solid angle.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEPIA - Genève
Institute:
inSTI - Institut des Sciences et Technologies industrielles
Date:
2007-01
Pagination:
5 p.
Published in:
Applied Radiation and Isotopes
Numeration (vol. no.):
2007, vol. 65, no. 5, pp. 534-538
DOI:
ISSN:
0969-8043
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2020-04-24, last modified 2020-10-27

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)