title: A portable TDCR system.
abstract: The triple-to-double-coincidence ratio method (TDCR) is an important method for activity standardization in metrology institutes worldwide. There is an increasing interest in portable systems that allow activity determination outside of specialized laboratories with high accuracy. Within the framework of the EMRP "MetroFission" project, several portable systems using different designs were developed. The PTB system described here is based on channel photomultipliers incorporated in a portable detection module, a separate electronics bin and a computer for data acquisition and storage. This miniature TDCR system was extensively tested and compared to the PTB reference TDCR system that is very well characterized and has been used in several intercomparisons.
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany. Electronic address: Ole.J.Naehle@ptb.de.
authors.forename: Ole
authors.initials: O
authors.lastname: Nähle
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany; Medizinische Hochschule Hannover (MHH), Stabsstelle Strahlenschutz und Abteilung Medizinische Physik-OE 0020, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Wanke
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Weierganz
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.
authors.forename: Karsten
authors.initials: K
authors.lastname: Kossert
keywords: Activity standardization; Coincidence and dead-time logic; EMRP; Free parameter model; Portable TDCR; TDCR