Using two detectors concurrently to monitor ambient dose equivalent rates in vehicle surveys of radiocesium contaminated land

Takeishi, Minoru; Shibamichi, Masaru; Malins, A.; Kurikami, Hiroshi; Murakami, Mitsuhiro*; Saegusa, Jun; Yoneya, Masayuki

Journal of Environmental Radioactivity, 177, p.1 - 12, 2017/10

AA2016-0534.pdf:1.79MB

https://doi.org/10.1016/j.jenvrad.2017.05.010

By convention radiation measurements from vehicle-borne surveys are converted to the dose rate at 1 m above the ground in the absence of the vehicle. To improve the accuracy of the converted results from vehicle-borne surveys, we investigated combining measurements from two detectors mounted on the vehicle at different heights above the ground. A dual-detector setup was added to a JAEA monitoring car and compared against hand-held survey meter measurements in Fukushima Prefecture. The dose rates obtained by combining measurements from two detectors were within 20% of the hand-held reference measurements. The combined results from the two detectors were more accurate than those from either the roof-mounted detector, or the detector inside the vehicle, taken alone. When radiocesium is deficient on a road compared to the adjacent land, mounting detectors high on vehicles yields dose rates closer to the values adjacent to the road. We also investigated mounting heights for vehicle-borne detectors using Monte Carlo -ray simulations.

Fluorocarbon decomposition examination by vitrified high-level waste

Miyamoto, Yoichi; Kawamura, Kazuhiro; Yoneya, Masayuki; Kobayashi, Aoi

PNC TN8410 98-119, 79 Pages, 1998/07

None

JAEA's technical experiences and lessons learned for environmental remediation of Fukushima, 1; Overview

Tokizawa, Takayuki; Noguchi, Shinichi; Yoneya, Masayuki; Momma, Toshiyuki; Nakayama, Shinichi; Ishida, Junichiro

no journal, , 

no abstracts in English