Borehole prompt gamma neutron activation and comparison with Monte Carlo simulation using MCNP code - Borehole PGNAA experiment comparison with MCNP

A borehole experiment using prompt gamma neutron activation analysis has be en performed in a large sample box having a volume of 1 m(3). Brine solutio ns having a salt concentration in the range of 0-10 wt% of sodium chloride has been used. Chlorine prompt gamma spectral response as a function of the salt concentrations have been obtained. A simulation of the above experime nts has also been carried out using the MCNP4A Monte Carlo code. Comparison of the experimental spectral response versus the simulated MCNP4A data has produced excellent agreement. In view of the good benchmark data it is pro posed that due to the inherent problems associated with the ordinary calibr ation procedures for the borehole logging tools, one could employ a combine d calibration/simulation scheme to circumvent these difficulties and achiev e more effective results. (C) 1999 Elsevier Science Ltd. All rights reserve d.