Radiometric analysis of samples of commonly sold fish species in Pakistan were carried out for the measurement of concentrations of naturally occurring and artificial radionuclides. For this purpose, a high resolution Ge detector was employed. Mean concentrations of 226Ra, 228Ra, and 40K in fish samples were 1.3 ± 0.3, 1.0 ± 0.2, and 90 ± 15 Bq kg−1, respectively, whereas concentration of 137Cs was not detected. The annual effective dose due to ingestion of these radionuclides through fish diet was evaluated to be 2.3 μSv y−1. This value of effective dose is found much below the average radiation dose of 0.29 mSv y−1 received per capita worldwide through ingestion of natural radionuclides during the consumption of food assessed by the United Nations Scientific Committee on the Effects of Atomic Radiation. It is concluded that fish supplies in the markets from the domestic fish farms are free from radiological risks. These results may contribute to the national and regional data regarding radioactivity levels in domestic fish species.
* Forestry, Wildlife & Fisheries Department, Government of the Punjab, Poonch House, Lahore, Pakistan; † Al-Imam Muhammad Ibn Saud Islamic University, Physics Department, Riyadh, Saudi Arabia; ‡ Directorate General of Fisheries, Punjab, Sanda Road, Lahore, Pakistan; § Department of Zoology, University of Karachi, Pakistan.
For correspondence contact: S. N. A. Tahir, Forestry, Wildlife & Fisheries Department, Government of the Punjab, Poonch House, Lahore, Pakistan, or email at email@example.com.
(Manuscript accepted 27 December 2009)