title: Calibration of the KRISS reference ionization chamber for certification of ²²²Rn gaseous sources.
abstract: A primary measurement system for gaseous (222)Rn based on the defined solid angle counting method has recently been constructed at KRISS and the reference ionization chamber used to measure the activities of gamma-emitting single radionuclides was adopted as a secondary standard for gaseous (222)Rn. A 20 mL flame-sealed glass ampoule source from the primary measurement system was used to calibrate the ionization chamber for (222)Rn. The (222)Rn efficiency of the ionization chamber was compared with that calculated by using a photon energy-dependent efficiency curve and that measured by using a standard (226)Ra solution. From the comparisons we draw the conclusion that the reference ionization chamber for gamma-emitting radionuclides can be a suitable secondary measurement system for gaseous (222)Rn sources.
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea. jmlee@kriss.re.kr
authors.forename: J M
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: P J
authors.initials: PJ
authors.lastname: Oh
authors.forename: T S
authors.initials: TS
authors.lastname: Park
authors.forename: B C
authors.initials: BC
authors.lastname: Kim
authors.forename: M S
authors.initials: MS
authors.lastname: Lee
mesh_terms: D000336:Aerosols / Q000032:analysis / Q000737:chemistry / Q000592:standards; D000396:Air Pollutants, Radioactive / Q000032:analysis / Q000737:chemistry* / Q000592:standards*; D002138:Calibration; D002568:Certification / Q000592:standards; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007700:Kinetics; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards*; D011886:Radon / Q000737:chemistry* / Q000592:standards*; D012016:Reference Values; D015203:Reproducibility of Results; D056910:Republic of Korea; D012680:Sensitivity and Specificity
chemical_list: D000336:Aerosols; D000396:Air Pollutants, Radioactive; D011886:Radon
keywords: (222)Rn; (226)Ra; Calibration; Efficiency curve; Radioactivity; Reference ionization chamber