The electrical characteristics of solid state devices such as the bipolar junction transistor (BJT), metal‐oxide semiconductor field‐effect transistor (MOSFET), and other active devices are altered by impinging photon radiation and temperature in the space environment. In this paper, the threshold voltage, the breakdown voltage, and the on‐resistance for two kinds of MOSFETs (200 V and 100 V of VDSS) are tested for γ‐irradiation and compared with the electrical specifications under the pre‐ and post‐irradiation low dose rates of 4.97 and 9.55 rad/s as well as at a maximum total dose of 30 krad. In our experiment, the γ‐radiation facility using a low dose, available at Korea Atomic Energy Research Institute (KAERI), has been applied on two commercially available International Rectifier (IR) products, IRFP250 and IRF540.
Two series of polyesters have been synthesized, one based on terephthalic acid and the other based on 2,6-naphthalene-dicarboxylic acid. Three diols were used: ethylene glycol, 1,4-butanediol and 1,10-decanediol. The polymers have been characterized and their thermal and radiation stabilities examined. The temperatures for 5% weight loss at a scanning rate of 20°C min À1 were in the range 376± 424°C. The stability of the polyesters decreased as the number of carbon atoms in the aliphatic diol increased, and the terephthalate polymers were not as stable as the naphthalate-based polymers. On radiolysis at 77 K about 50% of the radicals formed were anion radicals, with the total radical yields in the range 0.19±0.41 for the phthalate polyesters and in the range 0.08±0.12 for the naphthalate-based polymers. The radical yields increased with an increasing number of carbon atoms in the diol units. Radiolysis at 298 K produced radical yields in the range 0.02±0.06 for the phthalate polyesters and in the range 0.01±0.05 for the naphthalate-based polymers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.