大気浮遊塵の放射化分析

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タイトル別名
  • Activation Analysis of Airborne Dust
  • タイキ フユウ ジン ノ ホウシャカ ブンセキ

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Instrumental neutron activation analysis by γ-ray spectrometry with a high resolution Ge (Li) detector followed by data processing with an electronic computer was applied to elemental analysis of airborne dust samples which were collected at four stations selected in Osaka district, and atmospheric concentrations of more than thirty elements; Na, Al, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Br, Rb, Ag, Cd, In, Sb, Cs, Ba, La, Ce, Sm, Eu, Yb, Lu, Hf, Ta, W, Au, Hg and Th, were found to be determinable. Airborne dust was continuously collected on a membrane filter of 4.7 cm in diameter and 1.2 e in pore size during a month, and average concentrations in the atmosphere in the month were determined. Descriptions are made on preparation of the dust specimens and the standard reference specimens for irradiation, the radionuclides and their γ-ray energies which were used for the determinations and examples of observational results. On comparison of the concentrations of each element at the four stations with one another, it was found that there seemed to exist some characteristic trends in relative concentrations of several elements at the four stations. It is thus proposed that measurement of atmospheric concentrations of as many elements as possible at many more stations provides an effective aid for grasping the situation of air pollution in a heavily polluted area, even though not all the analyzed elements are hazardous to public health.

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