title: Practical correction method for impurities on activity measurements using isotope calibrators.
abstract: Radioactive impurities might cause significant error in the activity determination of a target nuclide using ionization chambers. In the present study, an impurity correction technique for (201)Tl sources was performed by applying two different responses of an IG12A20 and IG11N20 ionization chamber. This technique can be extended to another method in which an attenuation filter made of tin was used to obtain different responses of an argon filled IG12A20. The results obtained with these techniques were very consistent with each other and with the reference value within their uncertainty after making the impurity correction. Examples of (64)Cu activity determination were also shown.
authors.affiliation: Japan Radioisotope Association, 28-45, Honkomagome 2, Bunkyo-ku, Tokyo 113-8941, Japan. Electronic address: ishizu-hidetake@jrias.or.jp.
authors.forename: H
authors.initials: H
authors.lastname: Ishizu
authors.affiliation: Japan Radioisotope Association, 28-45, Honkomagome 2, Bunkyo-ku, Tokyo 113-8941, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamada
mesh_terms: D000465:Algorithms; D002138:Calibration / Q000592:standards*; D004340:Drug Contamination / Q000517:prevention & control*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007564:Japan; D058996:Quality Improvement; D000072232:Radiation Dosimeters / Q000592:standards*; D011868:Radioisotopes / Q000032:analysis* / Q000592:standards*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D011868:Radioisotopes
keywords: (201)Tl; (202)Tl; (64)Cu; Activity measurement; Attenuation filter; Correction method; Impurity; Ionization chamber