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Multiwalled boron nitride microtubes (BNMTs) shielding in thermal neutron absorbing
(Taylor & Francis Ltd, 2018) Arslan, K.; Seval, H. K.; Murathan, O. F.; Soysal, K.
In this study, multiwalled boron nitride microtubes (BNMTs) were synthesised from amorphous boron powder in pure nitrogen atmosphere controlled graphite furnace at 1300 degrees C for 6h with amorphous boron/manganese (IV) oxide (MnO2) catalyst mass ratio of 1/1. It was found that the synthesised BNMTs outer diameters and the lengths vary between 0.68 and 1.57 mu m and between 6.79 and 31.23 mu m, respectively, by the scanning electron microscope analysis. The surface layer of AISI 1040 steel material was coated with multiwalled BNMTs at 950 degrees C for 4h in a foundry furnace. Transport phenomena of BNMT molecules on surfaces of the steel were considered by diffusion. Neutrons from obtained Am-241-Be source were irradiated on the Fe-58 nuclei. The irradiation properties of the without and with BNMT coated steel materials were studied in the field of gamma emitted by Co-60. The radiation exposure rate of gamma radiation sources used at 1099 and 1291keV, respectively. The higher peak area was obtained in steel coated with BNMT according to non-coated steel from irradiation results of samples. These results show that BNMT coated steel was more capable for radiation shielding.