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Several Techniques for Improving Neutron-Energy Dependence of PADC Track Detector

Paper ID:185. Several Techniques for Improving Neutron-Energy Dependence of PADC Track Detector. K. Oda 1 , D. Hayano 1 , H. Ohguchi 1,2 , T. Yamauchi 1 , T. Yamamoto 2 1 Graduate School of Maritime Sciences,

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Several Techniques for Improving Neutron-Energy Dependence of PADC Track Detector

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  1. Paper ID:185 Several Techniques for Improving Neutron-Energy Dependence of PADC Track Detector K. Oda1, D. Hayano1, H. Ohguchi1,2, T. Yamauchi1, T. Yamamoto2 1 Graduate School of Maritime Sciences, Kobe University, Japan2 Oarai Research Center, Chiyoda Technol, Co., Ltd., Japan (Protection dosimetry service)

  2. Background “Personal neutron dosimetry with PNTD” • A lot of studies for 30 years by many groups • Fabrication of detector material (PADC) • sensitivity, transparency, stability, etc. • - Sensitization by radiator for higher energies • - Automatic counting system Practical application (at commercial base) - 30,000 pieces per month (fast processing) - stability, accuracy, fast processing

  3. energy response 5 15MeV Present status of CTC service - PADC fabrication in own laboratory quality control of detector material - Reduction of false pits by pre-soaking - Fast imaging system by HSP-1000 without & with presoaking Ohguchi et al., Radiation Measurements, 43[2-6], 2008

  4. Purpose of this study Check of existing techniques for improving sensitivity to 15-MeV neutrons without any modification in detector material & etching conditions 1. Analysis of other parameters (1-a) distribution in etch-pit diameter (1-b) distribution in gray size (1-c) distribution in shape factor 2. Multi-layer radiator (2-a) deuterized radiator (2-b) radiator-degrader technique

  5. Experimentals Neutron irradiation - 0.14, 0.57, 5.0, 15.0 MeV - Van de Graaff, National Institute of Advanced Industrial Science & Technology, Tsukuba, Japan Chemical process - fixed by CTC - pre-soaking & etching Etch-pit observation - HSP-1000, SEIKO - Auto-focus system - Scan 48 mm2 within 1 min - a few thousand tracks N. Yasuda et al., Radiation Measurements, 40 (2005)

  6. (1-a) Distribution in diameter F. d’Errico et al., Radiation Measurements 28 [1-6], 1997 0.14 0.57 5.0 15 MeV 1.1% 0.2% 0.7% 5.3%

  7. (1-a) Improvement of response error bar (1mSv) possible, but low statistical precision

  8. (1-b) Distribution in gray level - reason not clarified yet, but applicable ? 0.14 0.57 5.0 15 MeV 15.7% 11.3% 11.4% 28.0%

  9. (1-c) Etch-pit shape No difference !

  10. CH2 CD2 CD2 PNTD CH2 (2-a) Two-layer radiator K. Oda et al., Radiation Measurements 40 [2-6], 2005 neutrons C32D66 too expensive

  11. PNTD CH2 degrader (2-b) Radiator-degrader Matiullah & S. A. Durrani, Nucl. Instrum. Methods Phys. Res. B28, 1987 Spectrometery by unfolding K. Oda et al., J. Nucl. Sci. Tenol. 28 [7], 1991

  12. (2-b) Experimental data

  13. PNTD CH2 PNTD CH2 degrader (2-b) Calculated radiator effect 1mm

  14. Conclusion We checked five techniques as commercially-based routine procedure for improving the sensitivity for high-energy neutrons. - Etch-pit diameter  possible, statistical error - Gray size  possible, theoretical consideration needed - Shape factor  negative - Deuterized radiator  negative, too expensive - Radiator-degrader  promising, optimization of thickness

  15. Thank you for your patience.

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