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Radiation Protection Dosimetry Advance Access originally published online on April 5, 2006
Radiation Protection Dosimetry 2006 120(1-4):470-474; doi:10.1093/rpd/nci672
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Extremely high dose neutron dosimetry using CR-39 and atomic force microscopy

N. Yasuda1,*, Y. Koguchi2,4, M. Tsubomatsu3, T. Takagi3, I. Kobayashi3, T. Tsuruta2 and H. Morishima2

1 National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
2 Atomic Energy Research Institute, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-0818, Japan
3 Nagase Landauer, Ltd., 11-6 Hisamatsu-cho, Nihonbashi, Chuou-ku, Tokyo 103-8487, Japan
4 Chiyoda Technol Corporation, 3681 Narita-cho, Oarai-machi, Higashi Ibaraki Gun, Ibaraki 311-1313, Japan

* Corresponding author: nyasuda{at}nirs.go.jp

Atomic force microscopy (AFM) has been applied to the analysis of CR-39 nuclear track detectors for high dose neutron dosimetry. As a feasible study to extract the neutron dose, we have employed a 239Pu–Be neutron source with the traditional track density measurement of recoil proton etch pits from a high density polyethylene (CH2) radiator. After very short etching (~1 µm), etch pit densities were measured as a function of neutron fluence (neutron dose) up to 1.4 x 1010 cm–2 (6.6 Sv). Neutron sensitivity was also measured to be 6.6 x 10–4. Maximum measurable neutron dose was estimated to be ~200 Sv by measuring the fraction of the total image area occupied by the etch pits.


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