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Shielded Laser Ablation ICP-MS System for the Characterization of High Burnup Fuel
하영경,Hyun Gyum Kim,Won Ho Kim,Kwang Yong Jee,Sun Ho Han 한국원자력학회 2008 Nuclear Engineering and Technology Vol.40 No.4
In modern power reactors, nuclear fuels have recently reached 55,000 MWd/MtU from the initial average burnup of 35,000 MWd/MtU to reduce the fuel cycle cost and waste volume. At such high burnups, a fuel pellet produces fission products proportional to the burnup and creates a typical high burnup structure around the periphery region of the pellet, producing the so called ‘rim effect’. This rim region of a highly burnt fuel is known to be ca. 200 μm in width and is known to affect the fuel integrity. To characterize the local burnup in the rim region, solid sampling in the micro meter region by laser ablation is needed so that the distribution of isotopes can be determined by ICP-MS. For this procedure, special radiation shielding is required for personnel safety. In this study, we installed a radiation shielded laser ablation ICP-MS system, and a performance test of the developed system was conducted to evaluate the safe operation of instruments.
Laser Ablation에 의한 고방사성시편의 미세영역 시료채취 장치개발
한선호,하영경,한기철,박양순,지광용,김원호,Han Sun Ho,Ha Yeong Keong,Han Ki Chul,Park Yang Soon,Jee Kwang Yong,Kim Won Ho 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.1
Shielded laser ablation system composed of laser system, image analyser, XYZ translator with motion controller, ablation chamber, manipulator and various optics was designed. Nd:YAG laser which can be tunable from 1064 nm to 266 m was selected as light source. CCD camera(< $\pm$200) was chosen to analyze a crater less than 50 un in diameter. XYZ translator was composed of three linear stage which can travel 50 w with a minimum movement of 1 um and motion controller. Before the performance test, each part of system was optically aligned. To perform the ablation test, the specimen was ablated by 50 um interval and observed by image analyser The shape of crater was almost round, indicating laser beam has homogeneous energy distribution. The resolution and magnification of image system were compatible with the design.