title: [Contribution of 210Bi beta-ray induced bremsstrahlung to the emission of Pb-KX-rays observed in the lead shielded gamma-ray background spectrum (author's transl)].
abstract: Observation of gamma-ray background has been done by using a Ge(Li) semiconductor detector when it was placed inside the lead shielding material. With the aid of a very simple model calculation, the concentration of 210Pb radioisotope embedded in the lead material has been estimated to be 0.1-0.4 (Bq/Pb-g) (3-12 (pCi/Pb-g). The origin of Pb-KX-ray emission, the highest peak in the background spectrum, has been investigated by comparing the 210Pb-47 keV gamma-ray and Pb-KX-ray peak counts. As the results, about 50 +/- 30% of Pb-KX-ray production is estimated to be due to the Pb-K shell photoionization which is induced by the bremsstrahlung of 210Bi beta-ray.
mesh_terms: D001417:Background Radiation; D001729:Bismuth; D004583:Electrons; D005720:Gamma Rays; D007854:Lead / Q000032:analysis; D008962:Models, Theoretical; D011835:Radiation Protection; D011839:Radiation, Ionizing; D011868:Radioisotopes / Q000032:analysis; D014965:X-Rays
chemical_list: D011868:Radioisotopes; D007854:Lead; D001729:Bismuth