Monte Carlo based geometrical model for efficiency calculation of an n-type HPGe detector.
A procedure to optimize the geometrical model of an n-type detector is described. Sixteen lines from seven point sources ((241)Am, (133)Ba, (22)Na, (60)Co, (57)Co, (137)Cs and (152)Eu) placed at three different source-to-detector distances (10, 20 and 30 cm) were used to calibrate a low-background gamma spectrometer between 26 and 1408 keV. Direct Monte Carlo techniques using the MCNPX 2.6 and GEANT 4 9.2 codes, and a semi-empirical procedure were performed to obtain theoretical efficiency curves. Since discrepancies were found between experimental and calculated data using the manufacturer parameters of the detector, a detail study of the crystal dimensions and the geometrical configuration is carried out. The relative deviation with experimental data decreases from a mean value of 18-4%, after the parameters were optimized.
Cabal
Fatima Padilla
FP
Instituto Superior de Tecnologias y Ciencias Aplicadas, Quinta de los Molinos Ave. Salvador Allende, esq. Luaces, Plaza de la Revolucion, Ciudad de la Habana, CP 10400, Cuba. fpadilla@instec.cu
Lopez-Pino
Neivy
N
Bernal-Castillo
Jose Luis
JL
Martinez-Palenzuela
Yisel
Y
Aguilar-Mena
Jimmy
J
D'Alessandro
Katia
K
Arbelo
Yuniesky
Y
Corrales
Yasser
Y
Diaz
Oscar
O