Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SATO TAKASHI and ONO KOICHI,ANALYSIS ON X AND γ-RAY ATTENUATION FOR EXTENDED SOURCES IN AIR,Japanese Journal of Radiological Technology,03694305,Japanese Society of Radiological Technology,1976,31,5,407-411,https://cir.nii.ac.jp/crid/1390001206367448064,https://doi.org/10.6009/jjrt.kj00001369015