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ICRM Working Groups

ICRM activities are largely the responsibility of its working groups. Each group is guided by a coordinator who acts as a centre for ideas and communications and may organize conferences and workshops. There are now seven working groups with the following fields of interest and assigned coordinators:


Note: This information is made available through the National Institute of Standards and Technology (NIST) facilities. However, the views expressed and the decisions reported do not necessarily connote NIST agreement with, or endorsement of them. Further, NIST does not endorse any commercial products that may be mentioned. Any comments that you provide by e-mail or by submitting an on-line form may be sent to members of the ICRM who may not follow the same NIST privacy practices.

Alpha-Particle Spectrometry Working Group

Within the last years, the development of new techniques for the fabrication of Si detectors and the design of new measurement chambers, has produced considerable advances in the field of alpha-particle spectrometry with semiconductor detectors. Peak resolutions are now close to 8.5 keV, approaching the theoretical limit attainable with this kind of detectors. From the side of numerical analysis of spectra, a major effort has been dedicated by several laboratories to produce reliable fitting programs. Although it is difficult to give a comprehensive listing of activities, the following items describe the main areas of research.

  • Development of new measurement techniques
  • Improvement of fitting programs
  • Measurement of nuclear data with emphasis on alpha-particle emission probabilities
  • Computer simulation of the physical processes in the detector and source

Beta Particle Spectrometry Working Group

This Working Group is devoted to the development of the metrological aspects of beta-particle spectrometry and its applications. This includes, but is not restricted to:

  • Theory
    • Beta (β±) and electron capture (ε) transitions
    • Theoretical shape factors and influence of the nuclear current
    • Atomic effects
  • Experiments
    • Instrumentations used for beta spectrometry
    • Techniques that need beta information
    • Confidence on experimental shape factors
    • Data analysis and unfolding methods
  • Simulations
    • Confidence on the physical processes: low energies, radioactive decays, atomic rearrangements
    • Comparison of the results of different codes: Geant4, Penelope, etc.
  • Evaluations and dissemination
    • Confidence and uncertainties on experimental shape factors
    • Evaluation procedure for establishing recommended experimental shape factors
    • Mean energies, log ft values, database

Other suggested topics are welcome.


Gamma-Ray Spectrometry Working Group

The GSWG is devoted to the development of the metrological aspects of gamma-ray spectrometry and its applications. This includes, but is not restricted to: measurement techniques and equipment, determination of photon emission intensities, detector efficiency calibrations (including Monte Carlo methods), coincidence-summing corrections, uncertainties, correlations, new instrumentation, and x-ray spectrometry. Beginning with the ICRM 2005 conference, a series of exercises to compare Monte Carlo simulation codes, as applied to detector calibrations, was started. The exercises addressed problems such as direct computation of efficiency, application of Monte Carlo codes to efficiency transfer, computation of coincidence summing corrections in various cases. The results of the most recent exercise (concerning coincidence summing corrections in the presence of high x-ray contributions) were presented during the ICRM 2015 conference in Vienna.


Liquid Scintillation Working Group

This working group is devoted to the development of liquid-scintillation counting (LSC) techniques, especially in the field of radionuclide standardization. This concerns especially LS-sources data, the CIEMAT/NIST and the Triple to Double Coincidence Ratio (TDCR) methods, the theory and practice of LSC techniques, new measurement methods (e.g., HPMT), the modification and construction of new LS arrangements, the commercial LS spectrometers and the counting techniques). Astatine-211 LSC spectrum and decay scheme


Low Level Measurement Techniques Working Group

Iceberg in the ArcticThe Low Level Measurement Techniques Working Group provides a platform for all ICRM members interested in the measurement of low levels of radioactivity in whatever area, but with a particular emphasis on environmental measurements. Furthermore, by organising conferences and workshops on either general (the next, ICRM-LLRMT'16, will be held in September 2016 in Seattle, Washington, USA) or specific matters of interest, the Working Group facilitates the opportunity for radionuclide metrologists and scientists making low level measurements to meet and to discuss common problems and to disseminate information.



Nuclear Decay Data Working Group

The Nuclear Decay Data Working Group (3NDWG) facilitates awareness and communications between ICRM members interested in the measurement, calculation, compilation and evaluation of decay data, and the maintenance of computer-based decay data files (e.g., half-lives; energies and emission probabilities of alpha particles, beta particles, gamma rays, x-rays, conversion electrons and Auger electrons; internal conversion coefficients; transition types; and other relevant parameters, including uncertainties).

Members of the 3NDWG are encouraged to use the Working Group to communicate experimental and theoretical work, relevant evaluation procedures, their decay data problems, and to establish methodologies that are fully consistent with the satisfactory production of recommended decay data.

The 3NDWG Coordinator strives to maintain satisfactory links between all active members to achieve the primary aim (see above), and to inform them of all relevant activities identified with the creation and maintenance of decay-data files.

Yb-169 level scheme


Life Sciences Working Group

ampoule and syringes with radiopharmaceutical The purpose of the Life Sciences Working Group is to provide a forum for ICRM members to address radionuclide metrology issues as they relate to the life sciences. Issues may include, but are not limited to: development of methodologies to calibrate short-lived radionuclides of interest in nuclear medicine, measurement of decay properties (half-lives, decay energies and probabilities, etc.) of radionuclides used in nuclear medicine and biological research, development of measurement methodologies for transferring National Measurement Standards to the clinic and research laboratory, and development of methods to perform radioactivity assays of brachytherapy sources. The Working Group will facilitate finding solutions to these problems through workshops, publications, electronic communications (i.e., email), and collaborative work. The Coordinator will maintain communication links between the members and will periodically report to the group new issues and advancements in the field.

Coordinator's Annual Report

LSWG Meeting, 12-13 November 2008, NPL, Teddington, UK

Radionuclide Calibrator Measurements


Radionuclide Metrology Techniques Working Group

Following the ICRM 2001 conference in Braunschweig, the ICRM RMT working group was reactivated after some years of stagnation. Two immediate tasks were proposed for the working group: development of digitally recorded pulse train analysis software for radionuclide standardisation organise an intercomparison of tritiated water standards The RMT sessions at each of the subsequent ICRM conferences have included papers on a much wider range of topics than those currently being addressed by the working group. Indeed, the scope of the RMT working is so wide that is extremely difficult for the working group coordinators to arrange projects which address the needs of the members. It is hoped that members of the working group are willing to take a more proactive role in both the instigation and coordination of future collaborative projects.


Inquiries or comments: lisa.karam@nist.gov
Online: January 2001   -   Last update: April 2018