TY - JOUR
T1 - Minimum detectable activity concentration of radio-cesium by a LaBr3(Ce) detector for in situ measurements on the ground-surface and in boreholes
AU - Hasan, Moudud
AU - Rutten, Jos
AU - Camps, Johan
AU - Huysmans, Marijke
N1 - Score=10
PY - 2022/4/16
Y1 - 2022/4/16
N2 - A 3.81 × 3.81 cm LaBr3(Ce) detector based portable measurement setup has been developed for in situ gamma spectrometric survey of a contaminated site. This system is suitable for above- and below ground surface gamma spectrometric measurements of 137Cs. However, the minimum detectable activity concentration (MDAC), an important parameter of a measurement system, should be estimated for planning purposes of the gamma spectrometric survey. In this study, the MDAC of 137Cs for the measurement setup was investigated. The efficiency of the measurement setups was calculated from Monte Carlo simulations using MCNP code. The numerical model of the different studied set-ups, used in MCNP, performed well for the known cases. The results show that the MDAC varies with the position of the detector with respect to ground surface. A 5–20 min acquisition time, depending on the detector position, can be sufficient to get a MDAC of about 10% of the exemption limit of 137Cs (100 Bq/kg).
AB - A 3.81 × 3.81 cm LaBr3(Ce) detector based portable measurement setup has been developed for in situ gamma spectrometric survey of a contaminated site. This system is suitable for above- and below ground surface gamma spectrometric measurements of 137Cs. However, the minimum detectable activity concentration (MDAC), an important parameter of a measurement system, should be estimated for planning purposes of the gamma spectrometric survey. In this study, the MDAC of 137Cs for the measurement setup was investigated. The efficiency of the measurement setups was calculated from Monte Carlo simulations using MCNP code. The numerical model of the different studied set-ups, used in MCNP, performed well for the known cases. The results show that the MDAC varies with the position of the detector with respect to ground surface. A 5–20 min acquisition time, depending on the detector position, can be sufficient to get a MDAC of about 10% of the exemption limit of 137Cs (100 Bq/kg).
KW - MCNP
KW - Gamma spectrometry
KW - Site characterization
KW - Radioactivity
UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/48855517
U2 - 10.1016/j.apradiso.2022.110247
DO - 10.1016/j.apradiso.2022.110247
M3 - Article
SN - 0969-8043
VL - 185
SP - 1
EP - 10
JO - Applied Radiation and Isotopes
JF - Applied Radiation and Isotopes
M1 - 110247
ER -