Shielding calculation based on NCRP methodologies for some diagnostic x-ray facilities in Bangladesh
Abstract
When Wilhelm Konrad Roentgen accidentally discovered x-rays, he could have no idea what an enormous impact his discovery would have in future on medicine and industry. Today no hospital is complete without x-ray equipment although extensive use of this equipment gives rise to radiation doses that are usually well controlled, but in extreme cases, patients and occupationally exposed persons have been injured by this radiation. Therefore, only proper shielding design of an x- ray room can ascertain the safety of human health. The present study includes the shielding calculation of 13 diagnostic x-ray facilities of Mymensingh city in Bangladesh. In order to estimate the shielding for the diagnostic x-ray facilities, NCRP 49 & NCRP 147 methodologies have been followed. In the chosen facilities, a control panel barrier was commonly found inside the room to protect the occupational worker from the scattered radiation. The existing thickness of brick walls of the x-ray room are found 10 inch (2 mm lead equivalent). The calculated average thickness of lead for control panel (CP) barrier by NCRP 49 approach is 1.1 mm and 0.40 mm by NCRP 147 approach respectively. The present shielding condition of CP of the 85% facilities comply with the exposure limit of occupational worker (10µSv/h) as per national regulations. On the other hand, calculated shielding by NCRP 49 approach leads to 1.35 mm of lead for entrance door (ED) where as 0.64 mm of lead estimated by NCRP 147 for ED. The…
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