New source–moderator geometry to improve performance of 252Cf and 241Am–Be source-based PGNAA setups

Effect of Sample Moisture and Bulk Density on Performance of the241Am-Be Source Based Prompt Gamma Rays Neutron Activation Analysis Setup—a Monte Carlo Study

“…5,6) For sake of completeness it will be briefly described here. Figure 1 is a schematic representation of the PGNAA setup for source inside moderator geometry.…”

“…Also, the optimum external moderator length was 7 cm, and the source position was 0.75 cm from the sample. 6 5) For density calculations the sample moisture content of dry cement was assumed to be 5 wt% while for moisture calculations the sample bulk density was taken as 1.6 g/cm 3 .…”

“…[1][2][3][4] Knowledge of prompt gamma ray yield dependence upon bulk density and moisture content of the sample is very important in order to determine systematic errors in the response of a PGNAA setup. [1][2][3][4][5][6] Particularly, the gamma ray yield fluctuations due to variation in moisture content are one of the sources of uncertainty in the calibration parameters of a PGNAA setup. [1][2][3][4] The prompt gamma ray yield dependence upon moisture content of the sample is generally caused by additional moderation of incident neutrons in hydrogen moisture.…”

“…5,6) The prompt gamma ray yield from the source inside moderator setup and its dependence on sample bulk density and moisture content have been investigated using Monte Carlo simulations. Results of this study are presented in this paper.…”

Effect of Sample Moisture and Bulk Density on Performance of the 241Am-Be Source Based Prompt Gamma Rays Neutron Activation Analysis Setup — a Monte Carlo Study

“…6) The calculations were carried out for a dry Portland cement sample having the following composition in wt%: 5) For density calculations the sample moisture content of dry cement was assumed to be 5 wt% while for moisture calculations the sample bulk density was taken as 1.6 g/cm 3 . The gamma ray yield dependence upon bulk density and moisture content of the samples were studied in this paper.…”