title: Extremely high dose neutron dosimetry using CR-39 and atomic force microscopy.
abstract: 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 (239)Pu-Be neutron source with the traditional track density measurement of recoil proton etch pits from a high density polyethylene (CH(2)) radiator. After very short etching ( approximately 1 microm), etch pit densities were measured as a function of neutron fluence (neutron dose) up to 1.4 x 10(10) 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 approximately 200 Sv by measuring the fraction of the total image area occupied by the etch pits.
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan. nyasuda@nirs.go.jp
authors.forename: N
authors.initials: N
authors.lastname: Yasuda
authors.forename: Y
authors.initials: Y
authors.lastname: Koguchi
authors.forename: M
authors.initials: M
authors.lastname: Tsubomatsu
authors.forename: T
authors.initials: T
authors.lastname: Takagi
authors.forename: I
authors.initials: I
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Tsuruta
authors.forename: H
authors.initials: H
authors.lastname: Morishima
mesh_terms: D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D018625:Microscopy, Atomic Force / Q000379:methods*; D011092:Polyethylene Glycols / Q000737:chemistry* / Q000528:radiation effects*; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013499:Surface Properties; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods
chemical_list: C028827:CR 39; D011092:Polyethylene Glycols