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Estimation of external dose by car-borne survey in Kerala, India.

Hosoda M, Tokonami S, Omori Y, Sahoo SK, Akiba S, Sorimachi A, Ishikawa T, Nair RR, Jayalekshmi PA, Sebastian P, Iwaoka K, Akata N, Kudo H - PLoS ONE (2015)

Bottom Line: The contribution of 232Th to air kerma rate was over 70% at the measurement points with values larger than 0.34 μGy/h.The maximum value of the annual effective dose in Karunagappally Taluk was observed around coastal areas, and it was estimated to be 13 mSv/y.More than 30% of all the annual effective doses obtained in this survey exceeded 1 mSv/y.

View Article: PubMed Central - PubMed

Affiliation: Hirosaki University Graduate School of Health Sciences, Aomori, Japan.

ABSTRACT
A car-borne survey was carried out in Kerala, India to estimate external dose. Measurements were made with a 3-in × 3-in NaI(Tl) scintillation spectrometer from September 23 to 27, 2013. The routes were selected from 12 Panchayats in Karunagappally Taluk which were classified into high level, mid-level and low level high background radiation (HBR) areas. A heterogeneous distribution of air kerma rates was seen in the dose rate distribution map. The maximum air kerma rate, 2.1 μGy/h, was observed on a beach sand surface. 232Th activity concentration for the beach sand was higher than that for soil and grass surfaces, and the range of activity concentration was estimated to be 0.7-2.3 kBq/kg. The contribution of 232Th to air kerma rate was over 70% at the measurement points with values larger than 0.34 μGy/h. The maximum value of the annual effective dose in Karunagappally Taluk was observed around coastal areas, and it was estimated to be 13 mSv/y. More than 30% of all the annual effective doses obtained in this survey exceeded 1 mSv/y.

No MeSH data available.


The route map in Karunagappally Taluk.The abbreviations of each Panchayat are shown in the map and are as follows. AL: Alappad, CH: Chavara, CL: Clappana, KA: Karunagappally, KS: K. S. Puram, NE: Neendakara, OA: Oachira, PA: Panmana, TD: Thodiyoor, TK: Thekkumbhagam, TV: Thevalakkara, TZ: Thazhava.
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pone.0124433.g001: The route map in Karunagappally Taluk.The abbreviations of each Panchayat are shown in the map and are as follows. AL: Alappad, CH: Chavara, CL: Clappana, KA: Karunagappally, KS: K. S. Puram, NE: Neendakara, OA: Oachira, PA: Panmana, TD: Thodiyoor, TK: Thekkumbhagam, TV: Thevalakkara, TZ: Thazhava.

Mentions: Karunagappally Taluk, in Kerala state, India consists of 12 Panchayats which are administrative sub units [8]. The survey route which covered all the Panchayats of Karunagappally Taluk is shown in Fig 1. This route map was drawn using the Generic Mapping Tools (GMT) created by Wessel and Smith [9]. The 12 Panchayats were classified as low level, mid-level, and high level HBR areas according to the annual absorbed doses. Oachira, Thazhava, Thevalakkara, and Thodiyoor Panchayats were low level HBR areas; Clappana, Karunagappally, K. S. Puram, and Thekkumbhagam Panchayats were mid-level HBR areas; and Alappad, Chavara, Neendakara, and Panmana Panchayats were high level HBR areas.


Estimation of external dose by car-borne survey in Kerala, India.

Hosoda M, Tokonami S, Omori Y, Sahoo SK, Akiba S, Sorimachi A, Ishikawa T, Nair RR, Jayalekshmi PA, Sebastian P, Iwaoka K, Akata N, Kudo H - PLoS ONE (2015)

The route map in Karunagappally Taluk.The abbreviations of each Panchayat are shown in the map and are as follows. AL: Alappad, CH: Chavara, CL: Clappana, KA: Karunagappally, KS: K. S. Puram, NE: Neendakara, OA: Oachira, PA: Panmana, TD: Thodiyoor, TK: Thekkumbhagam, TV: Thevalakkara, TZ: Thazhava.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4401755&req=5

pone.0124433.g001: The route map in Karunagappally Taluk.The abbreviations of each Panchayat are shown in the map and are as follows. AL: Alappad, CH: Chavara, CL: Clappana, KA: Karunagappally, KS: K. S. Puram, NE: Neendakara, OA: Oachira, PA: Panmana, TD: Thodiyoor, TK: Thekkumbhagam, TV: Thevalakkara, TZ: Thazhava.
Mentions: Karunagappally Taluk, in Kerala state, India consists of 12 Panchayats which are administrative sub units [8]. The survey route which covered all the Panchayats of Karunagappally Taluk is shown in Fig 1. This route map was drawn using the Generic Mapping Tools (GMT) created by Wessel and Smith [9]. The 12 Panchayats were classified as low level, mid-level, and high level HBR areas according to the annual absorbed doses. Oachira, Thazhava, Thevalakkara, and Thodiyoor Panchayats were low level HBR areas; Clappana, Karunagappally, K. S. Puram, and Thekkumbhagam Panchayats were mid-level HBR areas; and Alappad, Chavara, Neendakara, and Panmana Panchayats were high level HBR areas.

Bottom Line: The contribution of 232Th to air kerma rate was over 70% at the measurement points with values larger than 0.34 μGy/h.The maximum value of the annual effective dose in Karunagappally Taluk was observed around coastal areas, and it was estimated to be 13 mSv/y.More than 30% of all the annual effective doses obtained in this survey exceeded 1 mSv/y.

View Article: PubMed Central - PubMed

Affiliation: Hirosaki University Graduate School of Health Sciences, Aomori, Japan.

ABSTRACT
A car-borne survey was carried out in Kerala, India to estimate external dose. Measurements were made with a 3-in × 3-in NaI(Tl) scintillation spectrometer from September 23 to 27, 2013. The routes were selected from 12 Panchayats in Karunagappally Taluk which were classified into high level, mid-level and low level high background radiation (HBR) areas. A heterogeneous distribution of air kerma rates was seen in the dose rate distribution map. The maximum air kerma rate, 2.1 μGy/h, was observed on a beach sand surface. 232Th activity concentration for the beach sand was higher than that for soil and grass surfaces, and the range of activity concentration was estimated to be 0.7-2.3 kBq/kg. The contribution of 232Th to air kerma rate was over 70% at the measurement points with values larger than 0.34 μGy/h. The maximum value of the annual effective dose in Karunagappally Taluk was observed around coastal areas, and it was estimated to be 13 mSv/y. More than 30% of all the annual effective doses obtained in this survey exceeded 1 mSv/y.

No MeSH data available.