J. SULTANA1* and R. KAJOL2
1= Associate Professor, Department of Physics, Khulna University of Engineering and Technology (KUET), Khulna, Bangladesh 2Research Student, Govt. B.L. College, Khulna, Bangladesh
ABSTRACT
Radioactivity and ionizing radiations have been a part of this world after its creation and this radioactivity is treated as one of the severe health hazard for the human beings. Even a low level activity in the air can cause a significant damage in the body. The study two upazila (Singra under Natore district and Phultala under Khulna district) administrative units of the country were studied to asses the exposure level. The data were taken from one foot above the ground with a radiation survey meter. The background radiation survey was carried out at 90 survey points over the Singra upazila and 42 survey points at Phultala upazila. The highest exposure level was recorded in the Singra thana upazula at Jore Mallica 0.0413 ± 0.0008 mR/hour and that in the Phultala upazula at Uttardihi 0.0393 ± 0.0018 mR/hour. The average values were 0.035 ± 0.0013 mR/hour and 0.031 ± 0.0013 mR/hour respectively. The study was conducted during June to November 2005.
Keywords: Background radiation, Air, Biological effect, nuclear fallout, radioactivity level and Harmful.