title: Calibration of KRISS reference ionization chamber for key comparison of (99m)Tc measurement.
abstract: KRISS, as the national metrology institute of Korea, has used a reference ionization chamber system to certify the activity of (99m)Tc aqueous sources, but could only recently participate in a comparison exercise by the BIPM (BIPM.RI(II)-K4.Tc-99m) to secure the international equivalence of (99m)Tc radioactivity measurement by way of the BIPM transfer instrument (SIRTI). The KRISS ionization chamber system was calibrated about 100 days before the comparison with a (99m)Tc solution source standardized by the 4πβ(LS)-γ(NaI(Tl)) coincidence counting method. During the comparison, beginning with a higher activity mother solution, the KRISS ionization chamber measured its specific activity without a dilution. The activity of a diluted-solution source was measured by the SIRTI at the same time.
authors.affiliation: Korea Research Institute of Standards and Science (KRISS), Republic of Korea. euisodong@gmail.com
authors.forename: Jong-Man
authors.initials: JM
authors.lastname: Lee
authors.forename: K B
authors.initials: KB
authors.lastname: Lee
authors.forename: S H
authors.initials: SH
authors.lastname: Lee
authors.forename: Tae Soon
authors.initials: TS
authors.lastname: Park
mesh_terms: D002138:Calibration / Q000592:standards*; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards*; D012015:Reference Standards; D012016:Reference Values; D056910:Republic of Korea; D013667:Technetium / Q000032:analysis* / Q000737:chemistry*
chemical_list: D013667:Technetium