Shielding Structure Design of 90Sr Isotope Radiation Source

Abstract

关键词 ： 90SrTiO3, 轫致辐射, 剂量当量, 屏蔽 Abstract： The bremsstrahlung spectrum on the surface of a 90SrTiO3 ceramic radiation source was computed by using MCNPX on the base of the designed structure of the 90Sr radioactive source. The distribution of the dose equivalent was calculated and analyzed. The results showed that the average photon flux was 1.2×1010 cm-2•s-1 on the surface of the radiation source, and the minimum dose equivalent rate of the surface was 20 Sv/h. By using 7 cm tungsten as the shielding structure, the maximum dose equivalent was 1.35 mSv/h on the surface and 0.027 mSv/h at 1 m below the surface. So the shielding material and structure designed meet the limit of radiation dose equivalent during the transportation.

Keywords

• 90srtio3 bremsstrahlung dose equivalent shielding