Nuclear Engineering and Technology

  • 제35권2호
  • /
  • Pages.165-170
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  • 2003
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
권호 표지

Development of Movable Detection System for Efficiency Measurement in 3-PM Liquid Scintillation Counting

  • Hwang, H-Y (Mokwon University) ;
  • Kwak, S.I (Mokwon University) ;
  • Cho, Y.H (Mokwon University) ;
  • Byun, J.I (Mokwon University) ;
  • Lee, H.Y (Mokwon University) ;
  • Seo, J.S (Mokwon University) ;
  • Kwak, J.Y (Mokwon University) ;
  • Lee, J.M (Korea Research Institute of Standards and Science) ;
  • Lee, K.B (Korea Research Institute of Standards and Science) ;
  • Park, T.S ;
  • Chung, K.H ;
  • Lee, C.W
  • 발행 : 2003.04.01
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초록

We developed an improved 3-PM liquid scintillation counting (3-PM LSC) method in which three detectors can be displaced to back and forth directions, and a data acquisition system being able to provide the values for all parameters required for the method. The detectors are entirely located in a 20-mm lead chamber of an inner diameter of 500 mm. A saw-toothed gear ties up all detectors so as to move them uniformly, up to 50 mm with unit of 1 mm. The data acquisition system was designed in an integrated circuit to perform the necessary works such as fast amplification, discrimination, coincidence and logic analysis. It generates values of nine parameters among twelve's generated in the 3-PH LSC method. The dead time of each counting channel is of extending type, valving from 10 to 100 $mutextrm{s}$. We measured the TDCR values with an unquenched liquid scintillation source 1"C by displacing the detectors with a step of 2.5 mm away from counting vial. Their values were derived on the range from 0.9 to 0.6. The extent is three times wider than those regions observed by applying the defocalization technique.ique.

키워드

참고문헌

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