Akademik Veri Yönetim Sistemi
International conference on Nuclear Technology, Radiation Safety and Advanced Technological Researches (ICNRA 2021), İstanbul, Türkiye, 10 - 11 Aralık 2021, cilt.1, sa.104, ss.134-135
Flexible polymers play an important role in enabling radioisotopes to be used effectively in polymeric materials in a wide variety of radiation-dependent applications where flexible materials are required. Since poly(imide siloxane) block copolymers can be used flexibly, they can be applied to a wide variety of industrial materials as compatible polymers. The poly (imide siloxane) block copolymer were synthesized as high resistance material with flexible and pelletized forms in order to be used in biomedical applications. Gamma transmission technique was applied to examine the gamma shielding property of the poly (imide siloxane) block copolymer. The gamma shielding capacity with <1 MeV as low-energy gamma photons by using Cs-137 radioisotope and with >1 MeV as high energy gamma photons by using Co-60 radioisotope were used for the gamma transmission technique. Comparing the linear attenuation coefficient increase in flexible and pelleted samples showed that flexible samples perform better for the gamma shield. It was also detected that the linear attenuation coefficient of the poly (imide siloxane) block copolymer in both flexible and pelletized forms has the highest gamma shielding property.
Sr-90 radioisotope was used in the beta transmission examination of poly (imide siloxane) block
copolymers. Beta properties were compared to evaluate radiation penetration for flexible sheet pelletized
forms of poly (imide siloxane) block copolymer. Granular structure in the pelletized form of pelletizing
the poly (imide siloxane) block copolymer improved radiation-shielding properties. The half-value layer
(HVL) for negative beta particles was detected as ~9.5 cm. It was derived that the pelletized form of poly
(imide siloxane) block copolymers has higher resistance against beta particles comparing to flexible form
about the radiation penetration. The granular content of the pelletized form of poly (imide siloxane) block
copolymers prevented the structure against beta particles penetration.
The pelletization of the grains of pelletized form of poly (imide siloxane) block copolymers improved
beta shielding properties of poly (imide siloxane) block copolymers for the use in biomedical applications
as biocompatible, high resistance materials.