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 หัวเรื่อง:ระดับความเข้มข้นของตะกั่ว -214 และบิสมัท -214 ในบรรยากาศบริเวณมหาวิทยาลัยเกษตรศาสตร์ ผู้เขียน: Rachanee Rugivarodom สื่อสิ่งพิมพ์:pdf AbstractBy gamma spectrometry of dusts in the atmosphere, the natural radioisotopes 214Pb and 214Bi were found. Samples of air were examined to ascertain the concentration per unit volume. Air particles were collected on fibre glass filters using a high volume jet air sampler. The two hundred-seventy air samples from six different locations at K.U. were monitored for gamma activities by a Hyper Pure Germanium (HPGe) detector. The gamma spectra were then examined and analyzed by microcomputer. The average concentrations of 214Pb and 214Bi in the atmosphere at K.U. were found to be (5.79+-0.62) x 10(superscript-12) ugm/m(superscript3) and 1.61+-0.31) x 10(superscript-11) ugm/m(superscript3) respectively. Safety standard of maximum concentration of 214Pb or 214Bi in the atmosphere is 1 x 10(superscript4) ugm/m(superscript3). The results show that the concentration of these isotopes is lower than the maximum of the safety standard. |