title: Development of an absolute gas-counting capability for low to medium activities.
abstract: Pacific Northwest National Laboratory (PNNL) is developing a capability to measure the absolute activity concentration of gaseous radionuclides using length-compensated proportional-counting. This capability will enable the validation of low-level calibration standards for use in PNNL's new shallow underground laboratory. Two sets of unequal length proportional counters have been fabricated; one set has been fabricated using ultra-low background (ULB) electroformed copper and a second set fabricated from Oxygen-Free High-Conductivity Copper (OFHC).
authors.affiliation: Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA. Richard.Williams@pnnl.gov
authors.forename: R M
authors.initials: RM
authors.lastname: Williams
authors.forename: C E
authors.initials: CE
authors.lastname: Aalseth
authors.forename: J H
authors.initials: JH
authors.lastname: Ely
authors.forename: A R
authors.initials: AR
authors.lastname: Day
authors.forename: J C
authors.initials: JC
authors.lastname: Hayes
authors.forename: E W
authors.initials: EW
authors.lastname: Hoppe
authors.forename: B
authors.initials: B
authors.lastname: Laferriere
authors.forename: E K
authors.initials: EK
authors.lastname: Mace
authors.forename: J
authors.initials: J
authors.lastname: Merriman
authors.forename: C T
authors.initials: CT
authors.lastname: Overman
authors.forename: A
authors.initials: A
authors.lastname: Seifert
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000737:chemistry*; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis*; D015203:Reproducibility of Results; D012588:Scintillation Counting / Q000295:instrumentation*; D012680:Sensitivity and Specificity
chemical_list: D005740:Gases; D011868:Radioisotopes
keywords: Absolute radiation measurement; Electroformed copper; Length compensated proportional counting; Ultra low-background; Uncertainty analysis