中性子放射化法によるギプス用セッコウ中のウラン濃度の定量 [in Japanese] Measurements of Uranium Concentrations in the Gypsum for a Plaster Bandage by the Neutron Activation Method [in Japanese]
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Concentrations of uranium were measured, by neutron activation analysis, in gypsum used in a plaster cast. The gypsum samples were powdered and mixed thoroughly using an agate mortar. Measurements of uranium were made by detecting γ-rays from <sup>239</sup>U, since those from <sup>239</sup>Np (a daughter nuclide of <sup>239</sup>U) cannot be detected because of the high background of bremsstrahlungs due to β-rays from <sup>32</sup>P produced by an (n, p) reaction of <sup>32</sup>S in gypsum. The results of these measurements showed the concentration of uranium to be 0.0358±0.0030ppm, which was much lower than that in other samples such as CRT glass and concrete blocks measured previously. This lower concentration probably results from the fact that the gypsum used in the present study was manufactured as a by-product of phcsphatic fertilizer from phosphate rock.
- Jpn. J. Health Phys.
Jpn. J. Health Phys. 31(4), 447-450, 1996-12-01
Japan Health Physics Society