Temperature performance of portable radiation survey instruments used for environmental monitoring and clean-up activities in Fukushima

Following the Fukushima Dai-ichi Nuclear Power Plant accident in March 2011, extensive radiation monitoring and environmental clean-up activities have been conducted throughout the Fukushima region. Outside air temperatures there reach 40°C in summer and −20°C in winter, which are beyond the quoted...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2017-08, Vol.137, p.210-215
Main Authors: Saegusa, Jun, Yanagisawa, Kayo, Hasumi, Atsushi, Shimizu, Takenori, Uchita, Yoshiaki
Format: Article
Language:English
Subjects:
Air temperature
Control equipment
Electric power plants
Environmental monitoring
Environmental radiation monitoring
Fukushima nuclear accident
Ionization chamber
Ionization chambers
NaI(Tl) scintillation detector
Nuclear accidents
Nuclear accidents & safety
Nuclear electric power generation
Nuclear power plants
Radiation
Radiation dosage
Radiation measurement
Radiation survey instrument
Studies
Temperature performance
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Summary:Following the Fukushima Dai-ichi Nuclear Power Plant accident in March 2011, extensive radiation monitoring and environmental clean-up activities have been conducted throughout the Fukushima region. Outside air temperatures there reach 40°C in summer and −20°C in winter, which are beyond the quoted operational range of many radiation survey instruments. Herein, temperature performance of four types of portable Japanese radiation survey instruments widely used in Fukushima was experimentally investigated using a temperature-controlled chamber. They included two ionization chamber type instruments, Fuji NHA1 and Aloka ICS-323C, and two NaI(Tl) scintillation type ones, Fuji NHC7 and Aloka TCS-172B. Experimental results showed significantly diverse characteristics on the temperature dependences from one type of instrument to another. For example, NHA1 overestimated the ambient dose-equivalent rate by as much as 17% at −30°C and 10% at 40°C, whereas the TCS-172B readings underestimated the rate by 30% at −30°C and 7% at 40°C. •Temperature performance of Japanese radiation survey instruments was investigated.•Experimental results showed diverse characteristics among the different instrument models.•Instruments' performance practically conforms to the requirement in IEC 60846-1 standard.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2016.02.012