Evaluation the nonlinear response function of a 3 x 3 in NaI scintillation detector for PGNAA applications.
Response functions of the 3 x 3 in NaI detector, which is mainly used in PGNAA applications, have been calculated by using MCNP-4C code. Calculated results are compared with measured data by using standard gamma-ray sources and prompt gamma-rays from pure element samples to check their accuracy. Prompt gamma-rays from pure element samples were used for this determination in the range from 1.942 to 10.829 MeV by use of (241)Am-Be neutron source and gamma-rays from radioisotope sources were used in the range from 0.081 to 4.438 MeV. Through the precise modeling of the detector structure, the agreement between both results has been improved. A surprising result is that in the PGNAA method the agreement between the MCNP simulation and experiment will be better by using a suitable neutron shield for NaI detector in order to prevent the activation of NaI (Tl) and a proper gamma-shield to attenuate the high-rate 4.438 MeV gamma-ray, (241)Am-Be gamma-ray component.
Miri Hakimabad
Hashem
H
Mashhad, Iran.
Panjeh
Hamed
H
Vejdani-Noghreiyan
Alireza
A
D004867:Equipment Design; D019544:Equipment Failure Analysis; D009502:Neutrons; D017711:Nonlinear Dynamics; D011829:Radiation Dosage; D015203:Reproducibility of Results; D012588:Scintillation Counting / Q000295:instrumentation* / Q000379:methods*; D012680:Sensitivity and Specificity