Abstract
In order to clarify the diminution characteristics of terrestrial gamma ray exposure rate due to snow cover, measurements were performed on the ground with and without snow cover. Aerial measurement was also performed above the snow cover in order to obtain information about collective dose evaluation by means of wide and quick environmental survey. The diminution factors observed were 0.36 - 0.17 for the region of 12 - 23 g/cm{sup 2} of water equivalent of the snow cover. According to a calculation by Monte Carlo method, the diminution factors for the same water equivalent range were 0.32 - 0.16. They agreed well as a whole, while the fluctuation of the factors measured were fairly large. The fluctuation is deemed to be due to the inhomogeneity in the distribution of the snow cover and the gamma ray field. The exposure rates on the ground with and without the snow cover were estimated using the aerial survey data with ARSAS (Aerial Radiological Survey and Assessment System). They agreed fairly well with that measured on the ground, while the range of the estimation was several 10%. The estimation range is expected to decrease with increasing the homogeneity of the distribution of the water
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Nagaoka, Toshi;
Sakamoto, Ryuichi;
Saito, Kimiaki;
Tsutsumi, Masahiro;
Moriuchi, Shigeru
[1]
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Citation Formats
Nagaoka, Toshi, Sakamoto, Ryuichi, Saito, Kimiaki, Tsutsumi, Masahiro, and Moriuchi, Shigeru.
Diminution of terrestrial gamma ray exposure rate due to snow cover. Ground survey and aerial survey.
Japan: N. p.,
1991.
Web.
Nagaoka, Toshi, Sakamoto, Ryuichi, Saito, Kimiaki, Tsutsumi, Masahiro, & Moriuchi, Shigeru.
Diminution of terrestrial gamma ray exposure rate due to snow cover. Ground survey and aerial survey.
Japan.
Nagaoka, Toshi, Sakamoto, Ryuichi, Saito, Kimiaki, Tsutsumi, Masahiro, and Moriuchi, Shigeru.
1991.
"Diminution of terrestrial gamma ray exposure rate due to snow cover. Ground survey and aerial survey."
Japan.
@misc{etde_10142686,
title = {Diminution of terrestrial gamma ray exposure rate due to snow cover. Ground survey and aerial survey}
author = {Nagaoka, Toshi, Sakamoto, Ryuichi, Saito, Kimiaki, Tsutsumi, Masahiro, and Moriuchi, Shigeru}
abstractNote = {In order to clarify the diminution characteristics of terrestrial gamma ray exposure rate due to snow cover, measurements were performed on the ground with and without snow cover. Aerial measurement was also performed above the snow cover in order to obtain information about collective dose evaluation by means of wide and quick environmental survey. The diminution factors observed were 0.36 - 0.17 for the region of 12 - 23 g/cm{sup 2} of water equivalent of the snow cover. According to a calculation by Monte Carlo method, the diminution factors for the same water equivalent range were 0.32 - 0.16. They agreed well as a whole, while the fluctuation of the factors measured were fairly large. The fluctuation is deemed to be due to the inhomogeneity in the distribution of the snow cover and the gamma ray field. The exposure rates on the ground with and without the snow cover were estimated using the aerial survey data with ARSAS (Aerial Radiological Survey and Assessment System). They agreed fairly well with that measured on the ground, while the range of the estimation was several 10%. The estimation range is expected to decrease with increasing the homogeneity of the distribution of the water equivalent and the gamma ray field. (author).}
place = {Japan}
year = {1991}
month = {Dec}
}
title = {Diminution of terrestrial gamma ray exposure rate due to snow cover. Ground survey and aerial survey}
author = {Nagaoka, Toshi, Sakamoto, Ryuichi, Saito, Kimiaki, Tsutsumi, Masahiro, and Moriuchi, Shigeru}
abstractNote = {In order to clarify the diminution characteristics of terrestrial gamma ray exposure rate due to snow cover, measurements were performed on the ground with and without snow cover. Aerial measurement was also performed above the snow cover in order to obtain information about collective dose evaluation by means of wide and quick environmental survey. The diminution factors observed were 0.36 - 0.17 for the region of 12 - 23 g/cm{sup 2} of water equivalent of the snow cover. According to a calculation by Monte Carlo method, the diminution factors for the same water equivalent range were 0.32 - 0.16. They agreed well as a whole, while the fluctuation of the factors measured were fairly large. The fluctuation is deemed to be due to the inhomogeneity in the distribution of the snow cover and the gamma ray field. The exposure rates on the ground with and without the snow cover were estimated using the aerial survey data with ARSAS (Aerial Radiological Survey and Assessment System). They agreed fairly well with that measured on the ground, while the range of the estimation was several 10%. The estimation range is expected to decrease with increasing the homogeneity of the distribution of the water equivalent and the gamma ray field. (author).}
place = {Japan}
year = {1991}
month = {Dec}
}