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KMID : 0364920060310030149
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Journal of Radiation Protection and Research
2006 Volume.31 No. 3 p.149 ~ p.153
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An ionization Chamber for a Steel Sheet Thickness Measurement
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Kim Han-Soo
Park Se-Hwa
Kim Yong-kyun
Park Se-Hwan
Ha Jang-Ho
Cho Seung-Yeon
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Abstract
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An ionization chamber is still widely used in many fields by virtue of its’ simple operational characteristics and the possibility of its’ various shapes. A parallel type of an ionization chamber for a steel sheet thickness measurement was designed and fabricated. High pure xenon gas, which was pressurized up to 6 atm, was chosen as a filling gas to increase the current response and sensitivity for a radiation. A high pressure gas system was also constructed. The active volume and the incident window size of the fabricated ionization chamber were $30\;cm^3\;and\;12\;cm^2$, respectively. Preliminary tests with a 25 mCi $^{241}Am$ gamma-ray source and evaluation tests in a standard X-ray field were performed. The optimal operation voltage was set from the results of the collection efficiency calculation by using an experimental two-voltage method. Linearity for a variation of the steel sheet thickness, which is the most important factor for an application during a steel sheet thickness measurement, was 0.989 in this study.
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KEYWORD
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ionization chamber, xenon, steel sheet thickness, saturation curve, aging test
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