Pages: 179-186

Authors: Walat Abdulqader Alhamdi and Mohammed Hussein Khalil

Abstract

In this study, a PbO, MnO₂, PbO + MnO₂ thin film (nano layer) was deposited onto a micro- scope glass, indium tin oxide glass, and aluminum with thicknesses 0.1 mm and 0.5 mm sub- strate, samples were prepared by the thermal spray technique. The coating of thin films was carried out onto the substrate at a temperature of 35 °C, furthermore, the prepared shield films were annealed at 100 °C and 250 °C for one hour. The shielding efficiency of each thin film on each substrate at different temperatures was analyzed using radioactive source ⁶⁰Co and NaI(Tl) well-type scintillation detector. The experimental results obtained were summarized: adding PbO or MnO₂ thin film together or separately to the substrate increases the attenuation of gamma-rays depending on the type of samples and annealed temperature. The minimum gamma reduction rate was found 0.3 % for indium tin oxide glass deposited with MnO₂ and annealed at 250 °C while the maximum was found in Al with thickness 0.1 mm (9.6 %) deposited with both PbO or MnO₂ together. This means that shielding efficiency increases by increasing the thickness of the thin film, annealed temperature and substrate type.

Key words: gamma shielding, MnO₂, PbO composition, thermal spray, scintillation detector

FULL PAPER IN PDF FORMAT (1,19 MB)