External gamma radiation monitoring in the environs of KAPS region using thermoluminescent dosimeters, during the years 1986-2003

This report discusses the results of gamma radiation-monitoring programme in the Kakrapar Atomic Power Station, situated near Surat, Gujrat. The monitoring, during the period 1986-2003, was carried out using thermoluminescent dosimeters at nineteen locations and covered the pre-operational period during 1986-1992 and operational period during 1992-2003. The report discusses the soil radioactivity contents in the region during the pre-operational period, prevalent gamma radiation levels and the comparison of these radiation levels during the period 1992-2003. Long term analyses on the data to assess the contribution of the power station to radiation levels in the environment of KAPS are discussed using correlation between the stack releases and thc doses recorded by TLD. Frequency distribution study and extreme value probability analysis, carried out on the data are also discussed in the report. (author)