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-ray irradiation response of silicon carbide semiconductor devices; Extremely high radiation resistanceSato, Shinichiro; Onoda, Shinobu; Makino, Takahiro; Fujita, Natsuko; Oshima, Takeshi; Yokoseki, Takashi*; Tanaka, Kazuya*; Hijikata, Yasuto*; Tanaka, Yuki*; Kandori, Mikio*; et al.
no journal, ,
We investigate the threshold voltage shift of Si-MOSFETs, SiC-MOSFETs, SiC-MESFETs, and SiC SITs (Static Induction Transistors) due to irradiation. As a result, no significant threshold voltage shift was observed up to the absorbed dose of 10
Gy in all the SiC transistors, whereas the serious degradation was observed in the Si-MOSFETs. This strongly indicates that radiation resistance of SiC-MOSFETs and the other SiC-transistors is far superior to that of Si-MOSFETs. The radiation resistance of SiC-MOSFETs fabricated by pyrogenic oxidation is higher than that of the SiC-MOSFETs fabricated by dry oxidation. This result reflects that radiation resistance of SiC-MOSFETs strongly depends on the gate oxidation process since the formed oxide layers have different properties. Also, radiation resistance of SiC-SITs and SiC MESFETs is higher than that of SiC-MOSFETs, since SITs and MESFETs do not have gate oxide layer.
Okumura, Yukiko
no journal, ,
The Small Quantities Protocol (SQP), which has the effect of holding in abeyance the implementation of most of the safeguards measures listed on the Comprehensive Safeguards Agreement, was drafted by the IAEA secretariat in order to lighten the burden of NNWS who have littled burden of non-nuclear material. Due to the few inspection rights, however, the SQP was modified in 2005. Today there are 48 NNWS that have lost their status of the SQP, but still have not concluded declaration under the CSA. This presentation will first enlighten the issue that arose from the modification of the SQP, followed by the measurements that should be taken and the contribution of ISCN to the IAEA's infrastructure development support for safeguards implementation.
Miwa, Shuhei; Osaka, Masahiko
no journal, ,
JAEA have launched a new research program for the evaluation of fission product chemistry under the severe accident. In this program, chemical form of fission product and release kinetics at the each condition such as release from fuel, transport in the reactor pressure vessel, reactor coolant system, primary containment vessel will be evaluated to clarify the cesium and iodine chemistry in BWR system under the severe accident. JAEA starts the development of experimental and analytical technologies, and acquiring the experimental data using simulant FP materials. For the evaluation of release kinetics, the empirical CORSOR-M model was improved so as to evaluate the effects of atmospheres.