Comparison of extrapolation chamber measurements of the absorbed dose rate for beta radiation between VNIIM (Russia) and PTB (Germany)

Helmstädter, K.; Böhm, J.; Ambrosi, P.; Fominych, V.I.; Rumyantseva, E. N.; Fedina, Š.

doi:10.1088/0026-1394/41/1a/06008

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…The entrance foil should have a thickness equivalent to or thinner than a layer of 70 µm of tissue to reflect the definition of H (0.07); an example is a Mylar foil of 50 µm thickness. Such a chamber of type ND-1009 [43] has been developed by the National Office of Measures (OMH), Hungary, in 1988, and is shown in figure 5. 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.…”

Section: Beta Secondary (Parallel) Chamber For Beta Radiationmentioning

confidence: 99%

Radiation protection and environmental standards

Ambrosi¹

2009

Metrologia

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Measurements for radiation protection dosimetry in medicine, industry, science and in the environment require instruments for photon, beta and neutron radiation and for combinations of them. To characterize and calibrate such instruments reference radiation fields are required, together with the dosimetry of these fields and the methods to calibrate the instruments. For all these tasks standards are available; an overview of them is given in this paper. In addition, an overview of secondary standard instruments is provided which serve as a tool to ensure the traceability between the primary standards laboratories and the calibrating and type testing laboratories. The part on neutrons is kept short as neutrons will be dealt with in a future special issue in this journal.About 10 years ago, Böhm et al (1999 Radiat. Prot. Dosim. 86 87–105) summarized the ISO recommended reference radiations used in radiation protection. This paper updates that review and adds environmental radiation and secondary standard instruments.

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Section: Beta Secondary (Parallel) Chamber For Beta Radiationmentioning

confidence: 99%

Radiation protection and environmental standards

Ambrosi¹

2009

Metrologia

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“…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:…”

Section: Introductionmentioning

confidence: 99%

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

Behrens

2023

Metrologia

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Firstly, in this work, the main characteristics of PTB’s new beta primary standard (BPS2) are presented in comparison to its previous one (BPS1), i.e., to the Böhm chamber. Secondly, the main changes of the revised ISO standard series on beta reference radiation fields, ISO 6980, are described. Finally, the application of the revised ISO 6980 to both PTB’s new and old beta primary standard is implemented. It turned out that both devices, BPS2 and BPS1, agree with each other within theier one sigma statistical uncertainties, i.e., approximately 3 % for 147Pm and 1.5 % to 1.8 % for 85Kr, 90Sr/90Y and 106Ru/106Rh radiation qualities. Therefore, as of approximately mid 2023, PTB will change from the 2004 to 2006 version of ISO 6980 to the revised version from 2022 and from the old beta primary standard, BPS1 (i.e., the Böhm chamber) to the new one, BPS2.

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“…Extrapolation Chamber (EC) is a type of plane-parallel ionization chamber with variable volume or air cavity. It is a primary standard absorbed dose measurement in tissue due to beta or x-ray radiation [1][2][3][4]. The air cavity perturbation for electrons is eliminated by making measurements as a function of the cavity depth and then extrapolating to zero depth.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo study of the BSS2 calibration system using the PTW 23392 extrapolation chamber

Araújo¹,

Behrens²,

Fonseca³

2022

J. Inst.

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The objective of the present work was to develop and validate a computational model of the Beta Secondary Standard type 2 (BSS2) system, with sources, filters and the PTW 23392 extrapolation chamber using MCNPx code. Simulations were performed to calculate the absorbed dose rate to tissue at null depth and 0.07 mm for the 85Kr, 90Sr/90Y and 147Pm beta radiation sources. The response curve was calculated by computing the energy deposited, at different depths, to the sensitive volume of the chamber. The deviations in the absorbed dose rate obtained using the MCNPx code compared to the calibration certificate data were found to be up to 2 %. Deviations up to 10 % were observed for the transmission factor calculated for all three beta sources. This work describes in detail the main parameters and common issues seeing when modelling an extrapolation chamber and three different beta standard sources.

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Comparison of extrapolation chamber measurements of the absorbed dose rate for beta radiation between VNIIM (Russia) and PTB (Germany)

Cited by 8 publications

References 2 publications

Radiation protection and environmental standards

Radiation protection and environmental standards

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

Monte Carlo study of the BSS2 calibration system using the PTW 23392 extrapolation chamber

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