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[SCI 2008] Development of a high pressure Xe Ionization chamber

관리자 2011.03.31
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Development of a high pressure Xe Ionization chamber
for Environmental Radiation Spectroscopy
 
Han Soo KIM, Yong Kyun KIM, Se Hwan PARK, Jang ho HA, Jong Kying KIM,
Sang Mook KANG, Seung Yeon CHO, Do Hyun KIM, and Eui Kwon CHUNG
 
  A High Pressure Xenon ionization chamber is a promising radiation detector for environmental radiation measurement due to its radiation hardness, its physical rigidity, and its capability of operation at a high temperature up to about 170℃. A cylindrical high pressure xenon ionization chamber, which was configured with a shielding mesh to improve its energy resolution, was designed on the basis of an electron transfer simulation code(EGSnrc) to extract an optimal density of Xe gas and a thickness of the chamber wall, An electron drift simulation code, Garfield, which was coupled with a Maxwell electric filed calculator, was also employed for the electron drift simulations due to the geometry of the shielding mesh. Shielding inefficiency was also calculated. A spherical ionization chamber was also designed and fabricated to monitor environmental radiation. A noble gas system was constructed to create a noble gas with a high purity and to inject the noble gas up to 60 atm. The combination of an oxygen absorbent(Oxisorb), a molecular sieve, and a high temperature getter can minimize the electro-negative impurities, such as the and gas, to below about several ppb levels. Preliminary tests such as leakage currents saturation currents, and has leak test were performed. The performance of the two fabricated ionization chambers at a low dose rate was tested by using a conventional shadow technique with a NIST certified 33.52 MBq ²²⁶Ra source in the calibration roon at KAERI.
 
KEY WORDS : high-pressure Xe, ionization chamber, environmental radiation, shadow shielding technique, EGSnrc, Garfield, shielding mesh
[SCI 2008] Performance of a high-pressure xenon ionization
[SCI 2009] Fabrication and performance characteristics