title: Clarification of the calculation of minimum detectable activity in low-level radioactivity measurements.
abstract: We discuss a new method to determine the value of minimum detectable activity (MDA) in low-level measurements. The method is based on the Feldman-Cousins unified approach which effectively combines the construction of confidence intervals with the determination of the decision threshold and MDA. The new method requires a single probability to be pre-specified for the determination of MDA as well as decision threshold and confidence interval, in contrast with the ISO 11929 method requiring three probabilities.
authors.affiliation: Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea. Electronic address: lee@kriss.re.kr.
authors.forename: K B
authors.initials: KB
authors.lastname: Lee
authors.affiliation: Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.
authors.forename: Jong Man
authors.initials: JM
authors.lastname: Lee
authors.affiliation: Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.
authors.forename: Tae Soon
authors.initials: TS
authors.lastname: Park
authors.affiliation: Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.
authors.forename: Sang Han
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.
authors.forename: Meeyoung
authors.initials: M
authors.lastname: Jeong
authors.affiliation: Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.
authors.forename: Min-Kie
authors.initials: MK
authors.lastname: Lee
keywords: Detection limit; Likelihood ratio ordering principle; MDA; Unified approach