International comparison EUROMET.RI(I)-S2 of extrapolation chamber measurements of the absorbed dose rate in tissue for beta radiation (EUROMET project No 739): Final report

Abstract

For quality assurance in the realization and transfer by the national standard laboratories of the unit of the absorbed dose rate at 0.07 mm tissue depth for beta radiation, comparison measurements among the primary standard facilities are needed. Although some bilateral comparisons have taken place for this quantity, the CCRI decided in May 2003 that a EUROMET supplementary comparison would be appropriate if inclusive of primary standards laboratories of other regional metrology organizations. The operation and results of such a comparison are reported here. A flat ionization chamber and measurement system was used as the transfer instrument. A comparison was made of the calibration coefficients of this transfer instrument in various beta-particle laboratory reference fields (Pm-147, Kr-85, Tl-204 and Sr-90/Y-90) measured by each of the eight participants from France, Italy, Finland, Germany, Russian Federation, USA, Canada and Japan. The PTB was the pilot laboratory and the comparison ran from January 2004 until April 2007 under EUROMET project No 739 and EUROMET.RI(I)-S2. The results for most of the participants are consistent with the stated uncertainties although an extreme deviation is apparent for Pm-147 beta radiation for one participant.Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by EUROMET, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

Références nationales du LNE-LNHB pour la dosimétrie des particules bêta en radioprotection

“…Entre 2004 et 2007, le LNE-LNHB a participé à une comparaison européenne (Euromet.RI(I)-S2) organisée entre huit laboratoires nationaux de métrologie [6] pour comparer les mesures de débit de dose absorbée dans les tissus. Pour cette comparaison, une chambre d'ionisation de transfert ainsi que son système de mesure ont circulé entre les différents laboratoires participants.…”

Radiation protection and environmental standards

“…This chamber fulfils the above-mentioned criterion of a factor 1.1 for beta radiation from the sources 90 Sr + 90 Y, 85 Kr, 204 Tl and 147 Pm, see figure 6. A similar chamber is the main part of a EUROMET intercomparison of the absorbed dose rate in tissue for beta radiation, see Behrens et al [44].…”

New beta primary standard (BPS2) and revised ISO 6980 at PTB

“…Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. [13,[18][19][20][21][22][23]. Since the 2004/2006 publication of ISO 6980 (and partly before) further investigations were undertaken at PTB regarding several topics:…”