Development and calibration of a real-time airborne radioactivity monitor using direct gamma-ray spectrometry with two scintillation detectors |
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| Affiliation: | 1. Unitat de Física Mèdica, Facultat de Medicina i Ciències de la Salut, Universitat Rovira i Virgili, ES-43201 Reus, Tarragona, Spain;2. Servei de Protecció Radiològica, Servei de Recursos Científics i Tècnics, Universitat Rovira i Virgili, ES-43007 Tarragona, Spain;1. Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;2. Institute for Systems and Robotics, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;3. Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;1. Medical Radiation Physics, Lund University, Sweden;2. Department of Statistics, Lund University, Sweden;1. Environmental Radioactivity Assessment Team, Korea Atomic Energy Research Institute, Yuseong, Daejeon 305-353, Republic of Korea;2. Department of Physics Education, College of Education, Kongju National University, Kongju 314-701, Republic of Korea |
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| Abstract: | The implementation of in-situ gamma-ray spectrometry in an automatic real-time environmental radiation surveillance network can help to identify and characterize abnormal radioactivity increases quickly. For this reason, a Real-time Airborne Radioactivity Monitor using direct gamma-ray spectrometry with two scintillation detectors (RARM-D2) was developed. The two scintillation detectors in the RARM-D2 are strategically shielded with Pb to permit the separate measurement of the airborne isotopes with respect to the deposited isotopes.In this paper, we describe the main aspects of the development and calibration of the RARM-D2 when using NaI(Tl) or LaBr3(Ce) detectors. The calibration of the monitor was performed experimentally with the exception of the efficiency curve, which was set using Monte Carlo (MC) simulations with the EGS5 code system. Prior to setting the efficiency curve, the effect of the radioactive source term size on the efficiency calculations was studied for the gamma-rays from 137Cs. Finally, to study the measurement capabilities of the RARM-D2, the minimum detectable activity concentrations for 131I and 137Cs were calculated for typical spectra at different integration times. |
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| Keywords: | Scintillation gamma-ray spectrometry NaI(Tl) Monte Carlo simulation Efficiency calculation |
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