[Radioactive and radiation standards. (III) 2. Standard gamma ray sources for exposure/rate measuring instrument calibration (2) (author's transl)].
D000398:Air Pollution, Radioactive / Q000032:analysis; D005720:Gamma Rays / Q000009:adverse effects / Q000592:standards*; D006801:Humans; D008452:Maximum Allowable Concentration; D011829:Radiation Dosage; D011839:Radiation, Ionizing / Q000592:standards*; D011874:Radiometry / Q000592:standards*; D012542:Scattering, Radiation