M. Shahriari et M. Sohrabpour, Borehole parametric study for neutron induced capture gamma-ray spectrometry using the MCNP code, APPL RAD IS, 52(1), 2000, pp. 127-135
The MCNP Monte Carlo code has been used to simulate neutron transport from
an Am-Be source into a granite formation surrounding a borehole. The effect
s of the moisture and the neutron poison on the thermal neutron flux distri
bution and the capture by the absorbing elements has been calculated. Therm
al and nonthermal captures for certain absorbers having resonance structure
s in the epithermal and fast energy regions such as W and Si were performed
. It is shown that for those absorbers having large resonances in the epith
ermal regions when they are present in dry formation or when accompanied by
neutron poisons the resonance captures may be significant compared to the
thermal captures. (C) 2000 Elsevier Science Ltd. All rights reserved.