Abstract
After the Great East Japan Earthquake on 11 March 2011, the environmental radiation dose in Fukushima City increased. On 11 April, 1 mo after the earthquake, the environmental radiation dose rate at various surfaces in the same area differed greatly by surface property. Environmental radiation measurements continue in order to determine the estimated time to 50% reduction in environmental radiation dose rates by surface property in order to make suggestions for decontamination in Fukushima. The measurements were carried out from 11 April to 11 November 2011. Forty-eight (48) measurement points were selected, including four kinds of ground surface properties: grass (13), soil (5), artificial turf (7), and asphalt (23). Environmental radiation dose rate was measured at heights of 100 cm above the ground surface. Time to 50% reduction of environmental radiation dose rates was estimated for each ground surface property. Radiation dose rates on 11 November had decreased significantly compared with those on 11 April for all surface properties. Artificial turf showed the longest time to 50% reduction (544.32 d, standard error: 96.86), and soil showed the shortest (213.20 d, standard error: 35.88). The authors found the environmental radiation dose rate on artificial materials to have a longer 50% reduction time than that on natural materials. These results contribute to determining an order of priority for decontamination after nuclear disasters.
| Original language | English |
|---|---|
| Pages (from-to) | 102-107 |
| Number of pages | 6 |
| Journal | Health Physics |
| Volume | 104 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 1 2013 |
| Externally published | Yes |
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Keywords
- Accidents nuclear
- Analysis statistical
- Environmental assessment
- Environmental impact
ASJC Scopus subject areas
- Epidemiology
- Radiology Nuclear Medicine and imaging
- Health, Toxicology and Mutagenesis
Cite this
Differences in rates of decrease of environmental radiation dose rates by ground surface property in Fukushima city after the Fukushima daiichi nuclear power plant accident. / Kakamu, Takeyasu; Kanda, Hideyuki; Tsuji, Masayoshi; Kobayashi, Daisuke; Miyake, Masao; Hayakawa, Takehito; Katsuda, Shin Ichiro; Mori, Yayoi; Okouchi, Toshiyasu; Hazama, Akihiro; Fukushima, Tetsuhito.
In: Health Physics, Vol. 104, No. 1, 01.01.2013, p. 102-107.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Differences in rates of decrease of environmental radiation dose rates by ground surface property in Fukushima city after the Fukushima daiichi nuclear power plant accident
AU - Kakamu, Takeyasu
AU - Kanda, Hideyuki
AU - Tsuji, Masayoshi
AU - Kobayashi, Daisuke
AU - Miyake, Masao
AU - Hayakawa, Takehito
AU - Katsuda, Shin Ichiro
AU - Mori, Yayoi
AU - Okouchi, Toshiyasu
AU - Hazama, Akihiro
AU - Fukushima, Tetsuhito
PY - 2013/1/1
Y1 - 2013/1/1
N2 - After the Great East Japan Earthquake on 11 March 2011, the environmental radiation dose in Fukushima City increased. On 11 April, 1 mo after the earthquake, the environmental radiation dose rate at various surfaces in the same area differed greatly by surface property. Environmental radiation measurements continue in order to determine the estimated time to 50% reduction in environmental radiation dose rates by surface property in order to make suggestions for decontamination in Fukushima. The measurements were carried out from 11 April to 11 November 2011. Forty-eight (48) measurement points were selected, including four kinds of ground surface properties: grass (13), soil (5), artificial turf (7), and asphalt (23). Environmental radiation dose rate was measured at heights of 100 cm above the ground surface. Time to 50% reduction of environmental radiation dose rates was estimated for each ground surface property. Radiation dose rates on 11 November had decreased significantly compared with those on 11 April for all surface properties. Artificial turf showed the longest time to 50% reduction (544.32 d, standard error: 96.86), and soil showed the shortest (213.20 d, standard error: 35.88). The authors found the environmental radiation dose rate on artificial materials to have a longer 50% reduction time than that on natural materials. These results contribute to determining an order of priority for decontamination after nuclear disasters.
AB - After the Great East Japan Earthquake on 11 March 2011, the environmental radiation dose in Fukushima City increased. On 11 April, 1 mo after the earthquake, the environmental radiation dose rate at various surfaces in the same area differed greatly by surface property. Environmental radiation measurements continue in order to determine the estimated time to 50% reduction in environmental radiation dose rates by surface property in order to make suggestions for decontamination in Fukushima. The measurements were carried out from 11 April to 11 November 2011. Forty-eight (48) measurement points were selected, including four kinds of ground surface properties: grass (13), soil (5), artificial turf (7), and asphalt (23). Environmental radiation dose rate was measured at heights of 100 cm above the ground surface. Time to 50% reduction of environmental radiation dose rates was estimated for each ground surface property. Radiation dose rates on 11 November had decreased significantly compared with those on 11 April for all surface properties. Artificial turf showed the longest time to 50% reduction (544.32 d, standard error: 96.86), and soil showed the shortest (213.20 d, standard error: 35.88). The authors found the environmental radiation dose rate on artificial materials to have a longer 50% reduction time than that on natural materials. These results contribute to determining an order of priority for decontamination after nuclear disasters.
KW - Accidents nuclear
KW - Analysis statistical
KW - Environmental assessment
KW - Environmental impact
UR - http://www.scopus.com/inward/record.url?scp=84870901622&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84870901622&partnerID=8YFLogxK
U2 - 10.1097/HP.0b013e31826ab94c
DO - 10.1097/HP.0b013e31826ab94c
M3 - Article
C2 - 23192094
AN - SCOPUS:84870901622
VL - 104
SP - 102
EP - 107
JO - Health Physics
JF - Health Physics
SN - 0017-9078
IS - 1
ER -