title: [Shielding evaluation of lead-free board for diagnostic X-rays].
abstract: For physical foundation data used in the shielding calculation of structural facilities such as a radiation room, there are air kerma transmissions concerning the thickness of shielding objects, and half value layers and tenth value layers concerning a greatly attenuated wide X-ray beam. Accordingly, we evaluated the above-mentioned items with a lead-free board, which is mixed sulfuric acid calcium and barium sulfate with equiponderance for the amount of sulfuric acid calcium included in the usual plasterboard. Permeability in NCRP Report 147 is expressed by 3 parameters, α, β and γ, and shielding objects x. It showed that it corresponds to the measurement point and permeability curve with parameters, α, β and γ obtained by nonlinear regression analysis. Furthermore, we calculated the half value layer and tenth value layer concerning the greatly attenuated wide X-ray beam. The evaluated lead-free board, used in this examination, is useful as the shielding material for the diagnosis X-ray and, moreover, the partition wall materials are hard enough, with a board that is even heavier than the usual plaster board. Besides, the use of lead-free materials is friendly to the general environment.
authors.affiliation: Tokyo Metropolitan University, Japan.
authors.forename: Yoh
authors.initials: Y
authors.lastname: Katoh
authors.forename: Masaru
authors.initials: M
authors.lastname: Tsukada
authors.forename: Sogo
authors.initials: S
authors.lastname: Mita
authors.forename: Masahiro
authors.initials: M
authors.lastname: Fukushi
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Nyui
authors.forename: Shinji
authors.initials: S
authors.lastname: Abe
authors.forename: Junichi
authors.initials: J
authors.lastname: Kimura
mesh_terms: D001466:Barium Sulfate; D002133:Calcium Sulfate; D003252:Construction Materials; D007854:Lead; D008420:Manufactured Materials; D011835:Radiation Protection / Q000295:instrumentation*; D011859:Radiography; D014965:X-Rays
chemical_list: D001466:Barium Sulfate; D007854:Lead; D002133:Calcium Sulfate