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Application of Compton-Suppressed Self-Induced XRF to Spent Nuclear Fuel Measurement
박세환,조광호,이승규,서희,이해헌,원병희,안성규,구정회 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.9
Self-induced X-ray fluorescence (XRF) is a technique by which plutonium (Pu) content in spent nuclear fuel can be directly quantified. In the present work, this method successfully measured the plutonium/uranium (Pu/U) peak ratio of a pressurized water reactor (PWR)’s spent nuclear fuel at the Korea atomic energy research institute (KAERI)’s post irradiation examination facility (PIEF). In order to reduce the Compton background in the low-energy X-ray region, the Compton suppression system additionally was implemented. By use of this system, the spectrum’s background level was reduced by a factor of approximately 2. This work shows that Compton-suppressed selfinduced XRF can be effectively applied to Pu accounting in spent nuclear fuel.
폐쇄성 무정자증의 원인 및 정관부고환문합술을 이용한 수술적 교정 가능성
박세환,서주태,조대기,이중식 대한남성과학회 2011 The World Journal of Men's Health Vol.29 No.2
Purpose: To define the causes of obstructive azoospermia (OA) and evaluate the possibility and efficacy of microsurgical correction. Materials and Methods: Sixty-seven patients diagnosed as OA with normal spermatogenesis preoperatively and initially planned to microsurgical vasoepididymostomy from December 2003 and November 2009 were retrospectively analyzed. Causes of OA were analyzed and patency rate and pregnancy outcomes of their female partners were measured. Results: Thirty-one patients (46.3%) could not correct their OA because of obstruction of the distal vas deferens, epididymal atrophy and/or hypotrophy and vasal injury due to previous surgery. Among the 36 patients undergone microsurgical vasoepididymostomy (mean age of patients and their female partners were 32.9 and 31.3 years, respectively), 32 patients (88.9%) were corrected bilaterally and 4 patients (11.1%) unilaterally. The overall patency rate was 17 patients (47.2%); being 15 and 2 patients for bilateral and unilateral procedure, respectively. Among the 17 patients regained the patency after surgery, except 3 cases without followed up, 6 cases achieved natural pregnancy and also 6 cases achieved the pregnancy using the assisted reproduction. Conclusions: According to the affected point of reproductive tract, not all men with obstructive azoospermia were candidates for microsurgical reconstruction. However, reasonable outcomes were achieved in the microsurgical reconstruction cases and it should be primary therapeutic method in obstructive azoospermia. For those in whom reconstruction is not a viable option, surgical methods for sperm retrieval are available to have their own biological children.