title: Gamma spectrum unfolding for a NaI monitor of radioactivity in aquatic systems: experimental evaluations of the minimal detectable activity.
abstract: This paper deals with the experimental evaluation of the minimal detectable activity achievable by unfolding the gamma spectra of a NaI monitor. An aquatic monitor initially developed by the Institut des Radio-Eléments (IRE) is used for the application. Unfolding of the spectra is performed with GRAVEL, a UMG package code, on the basis of a response matrix obtained with MCNP5.1.40. Experimental data have been measured at IRE, in a 20m(3) seawater tank, for known activities of (137)Cs mixed with other gamma emitters ((40)K, (133)Ba, (113)Sn and (139)Ce). Deconvolution allows one to reduce the MDA of (137)Cs by an order of magnitude.
authors.affiliation: Institut Supérieur Industriel de Bruxelles, rue Royale, 150, Brussels BE1000, Belgium. bare@isib.be
authors.forename: J
authors.initials: J
authors.lastname: Baré
authors.forename: F
authors.initials: F
authors.lastname: Tondeur
mesh_terms: D001465:Barium Radioisotopes / Q000737:chemistry; D002565:Cerium Radioisotopes / Q000737:chemistry; D002588:Cesium Radioisotopes / Q000737:chemistry*; D003198:Computer Simulation; D005720:Gamma Rays; D011197:Potassium Radioisotopes / Q000737:chemistry; D011834:Radiation Monitoring / Q000295:instrumentation*; D011874:Radiometry / Q000295:instrumentation; D012623:Seawater / Q000737:chemistry*; D013051:Spectrometry, Gamma / Q000295:instrumentation*; D014004:Tin Radioisotopes / Q000737:chemistry; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D001465:Barium Radioisotopes; D002565:Cerium Radioisotopes; D002588:Cesium Radioisotopes; D011197:Potassium Radioisotopes; D014004:Tin Radioisotopes; D014875:Water Pollutants, Radioactive