Fig 1.
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.
Fig 2.
Correlation between count rates outside and inside the car.
This regression formula was used as the shielding factor of the car body.
Fig 3.
Correlation between air kerma rate which was calculated by software using the response matrix method and total count rate outside the car.
This regression formula was used as the dose rate conversion factor.
Fig 4.
The distribution map of air kerma rate in Karunagappally Taluk.
This map was also drawn using GMT [9].
Fig 5.
The air kerma rates for each Panchayat as measured by the car-borne survey.
Gray shows measurements in high level background radiation areas. White shows measurements for mid-level and low level background radiation areas.
Table 1.
The measured activity concentrations and the contributions of 40K, 238U and 232Th to air kerma rates in Karunagappally Taluk.
Table 2.
The estimated annual effective doses of each Panchayat in Karunagappally Taluk.