Open AccessImproving the uniformity of the gamma production rate distribution with depth in a large biological sample for an IVNAA facility
Author(s) -
Laleh Rafat Motavali
Publication year - 2009
Publication title -
nuclear technology and radiation protection
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.31
H-Index - 16
eISSN - 1452-8185
pISSN - 1451-3994
DOI - 10.2298/ntrp0902119h
Subject(s) - collimator , graphite , monte carlo method , materials science , neutron , sample (material) , imaging phantom , nuclear engineering , neutron capture , gamma ray , radiochemistry , optics , nuclear physics , physics , composite material , chemistry , mathematics , statistics , thermodynamics , engineering
The design studies related to a prompt γ-rays in vivo neutron activation analysis facility are described. The designs were based on two neutron sources: 252Cf and 241Am-Be, four collimator materials: polyethylene, 5% boric-acid doped polyethylene, graphite, and the heavy water, two collimator shapes: pyramidal and rectangular, and two configurations: unilateral and bilateral. The aim of this work was improving the uniformity of the gamma production rate distribution with depth in a large biological sample. For the sample, a water phantom measuring 32cm x 16cm x 100cm was simulated. The simulations were performed by MCNPX 2.4.0 Monte Carlo code. This study recommends the prompt γ-rays IVNAA facility in the bilateral configuration with graphite as a collimator material and 241Am-Be as neutron source