Assessment of natural gamma emitting radionuclides in composite food samples
2001
Aslam, M. | Orfi, S.D. | Khan, K. | Rashid, A. | Jabbar, A. | Akhter, P. | Malik, G.M. | Jan, F. | Shafiq, M. (Pakistan Inst. of Nuclear Science and Technology, Islamabad (Pakistan). Environmental Monitoring Lab., Health Physics Div.)
The Environmental Monitoring Laboratory has also been engaged in radiometric analysis of composite food as a part of environmental surveillance and monitoring of low-level radioactivity in various environmental media. The samples of cooked meal, served at PINSTECH cafeteria, were collected and assessed for gamma emitting radionuclides. A high purity germanium (HPGe) detector coupled with high-resolution multichannel analyzer (MCA) and Gennie- 2000 software was used for the detection, analysis and data acquisition. Radiopotassium (40K) was the only radionuclide present in all the lunch samples. The range of activities was found to be from 18.06 plus minus 0.51 to 74.93 plus minus 2.97 Bq meal-1 with cumulative average value of 42.58 plus minus 10.14 Bq meal-1 for the sampling period from 1991-1998. Based on cooked meal taken by a man in the cafeteria (250 lunches y-1), the annual intake of 40K was found to be 1.06x104 Bq y-1 which is 0.11 % of the annual limit on intake (ALI) of this radionuclide as specified by IAEA.
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