title: Self-absorption correction for gamma spectrometry of powdered milk samples using Marinelli beaker.
abstract: Self-absorption was measured for the activity calculation of the 1460.8 and 2614.47 keV lines of the 40K and the 208Tl, respectively, in powdered milk samples. Five Marinelli beakers were prepared with powdered milk in different degrees of compaction and the spectra were measured with an HPGe detector. The detection efficiency versus density was obtained and the self-absorption correction factors versus density were calculated for powdered milk. The results obtained show that this factor must be considered in the calculations of activities.
authors.affiliation: Departamanto de Química e Física, Universidade Estadual do Centro Oeste, Santa Cruz, Guarapuava-PR, Brazil. fmelquiades@unicentro.br
authors.forename: F L
authors.initials: FL
authors.lastname: Melquiades
authors.forename: C R
authors.initials: CR
authors.lastname: Appoloni
mesh_terms: D000818:Animals; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D005507:Food Contamination, Radioactive / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D011208:Powders; D011854:Radiochemistry; D013051:Spectrometry, Gamma / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data
chemical_list: D011208:Powders