Measurements of effective doses of natural background level of neutrons with etched-track detectors

An etched-track method was applied for a measurement of the effective dose of natural background neutrons. Ten assemblies of polycarbonate film and 10B were placed at the center of a rem-counter type moderator. The assemblies were put in an air-tight container in order to avoid a continuous contribu...

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Bibliographic Details
Published inHealth physics (1958) Vol. 83; no. 4; p. 553
Main Authors Kumamoto, Yoshikazu, Noda, Yutaka
Format Journal Article
LanguageEnglish
Published United States 01.10.2002
Subjects
Calibration
Electrochemistry
Neutrons
Particle Accelerators
Radiometry - methods
Radon
Sensitivity and Specificity
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Summary:An etched-track method was applied for a measurement of the effective dose of natural background neutrons. Ten assemblies of polycarbonate film and 10B were placed at the center of a rem-counter type moderator. The assemblies were put in an air-tight container in order to avoid a continuous contribution from radon. Electrochemical etching was adopted. The sensitivity of the detector was 0.21 +/- 0.02 microSv pit(-1) cm2. After a period of storage of 4.3 y, the number of recorded artifact pits in the films corresponded to an effective dose rate of 0.8 +/- 0.2 microSv y(-1). The effective dose rate of natural background neutrons was 18.1 +/- 3.6 microSv year(-1) for the same period, with an artifact dose being subtracted. The total net number of etched-track pits of the present detector was 75 +/- 15 when used for measuring an effective dose of natural background level neutrons for 1 mo, which gives enough counting statistics. The method can thus be applied for monitoring the effective dose of neutrons around nuclear sites and high-energy accelerator facilities.
ISSN:0017-9078
DOI:10.1097/00004032-200210000-00016