Report on EUROMET.RI(I)-K1 and EUROMET.RI(I)-K4 (EUROMET project no. 813): Comparison of air kerma and absorbed dose to water measurements of<sup>60</sup>Co radiation beams for radiotherapy

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During the Euramet project JRP7 ‘External Beam Cancer Therapy’, PTB and LNE–LNHB used primary standards to determine the absorbed dose to water under IMRT conditions (in small fields). PTB used a water calorimeter to determine the absorbed-dose-to-water references in 6 MV and 10 MV beams for field sizes of 10 cm × 10 cm and 3 cm × 3 cm while LNE–LNHB used graphite calorimeters in 6 MV and 12 MV beams for field sizes of 10 cm × 10 cm, 4 cm × 4 cm and 2 cm × 2 cm. The purpose of this study is to compare PTB and LNE–LNHB new absorbed-dose-to-water references. LNE–LNHB sent an Exradin A1SL ionization chamber traceable to its primary standard to the PTB for calibration in 60Co and in linac beams and PTB sent a PTW 31010 ionization chamber traceable to its primary standard to LNE–LNHB for calibration in 60Co and in linac beams. Calculated Sw,air will be used as beam quality specifier for the ionization chamber comparison at different field sizes. The standard uncertainties (k = 1) of PTB and LNE–LNHB calibration coefficients lie respectively between 0.25% (60Co) and 0.40% (linac) and between 0.29% and 0.46%. PTB and LNE–LNHB absorbed-dose-to-water references developed for this project, based respectively on water calorimetry and on graphite calorimetry, agree within 1.5 standard deviations for field size of 10 cm × 10 cm down to 2 cm × 2 cm and for beams of 6 MV to 10 MV.

Section: Results Under Usual Reference Conditions (10 CM × 10 Cm) As ...mentioning

confidence: 94%

Comparison of absorbed-dose-to-water units for Co-60 and high-energy x-rays between PTB and LNE–LNHB

Delaunay¹,

Kapsch²,

Gouriou³

et al. 2012

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“…Note that only the PTB has published CMC for the air kerma area product quantity. BIPM.RI(I)-K2 and BIPM.RI(I)-K3, between MKEH and BIPM at low and medium CCRI therapy radiation qualities [18,19,20,21]. According to the BIPM and EURAMET database, only the EURAMET RI(I)-S10 has been reported, which is a bilateral supplementarysupporting comparison between IAEA and PTB [17,22], as well as the EURAMET 536 project which concerned mammography radiation qualities [2].…”

Section: = Eqmentioning

confidence: 99%

Comparison of air kerma area product and air kerma meter calibrations for X-ray radiation qualities used in diagnostic radiology

Hourdakis¹,

Csete²,

Daures³

et al. 2015

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Report on the EURAMET project #1177, identified in the BIPM key comparison database (KCDB) as EURAMET RI(I)-S9 C.J. Hourdakis (a) , I. Csete (b,j) , J. Daures (c) , H. Jarvinen (d) , L-C Mihailescu (e) , V. Sochor (f) , L. Novak (g) , K. M. Pedersen (h) , A. Kosunen (d) , P. Toroi (d) , M. Denoziere (c) , L. Büermann (i) , A. Megzifene (b) , G. Einarsson (k) , P. Ferrari (l) , J. dePooter (m) , H. Bjerke (n) , M. Brodecki (o) , J. Cardoso (p) , S. Bercea (q) , O. Ciraj-Bjelac (r) , J. Compel (s) , D. Glavič-Cindro (t) , M.Ginjaume (u) , Linda Persson (v) and Jan-Erik Grindborg (v)

“…These data are presented graphically in Figure 3 where the black square indicates a result that dates prior to 1998 although the ARPANSA has made a comparison quite recently. The results of three published regional metrology organization (RMO) comparisons are also included [17,18,19]. It is of interest to note that the previous result of the GUM participation in the EUROMET comparison was prior to the update of their primary standard, using Monte Carlo corrections for the wall effects in particular.…”

Section: Comparison Of a Given Nmi With The Key Comparison Reference mentioning

confidence: 99%

“…The degree of equivalence between two laboratories i and j, one participant in BIPM.RI(I)-K1 and one in RMO.RI(I)-K1, or both participant in an RMO.RI(I)-K1, is given by a pair of terms both expressed in mGy/Gy: D ij = D i -D j and U ij , its expanded uncertainty (k = 2). The approximation for U ij is given in the relevant RMO.RI(I)-K1 Final Report [17,18,19].…”

Section: • Linking An Rmori(i)-k1 To Bipmri(i)-k1 Measurand : Air Kmentioning

confidence: 99%

Comparisons of the standards for air kerma of the GUM and the BIPM for⁶⁰Co and¹³⁷Cs gamma radiation

Allisy-Roberts¹,

Kessler²,

Burns³

et al. 2011

Direct comparisons of the standards for air kerma of the Główny Urząd Miar (GUM, Poland) and of the Bureau International des Poids et Mesures (BIPM) were carried out in the 60 Co and 137 Cs radiation beams of the BIPM in 2006. The results, expressed as ratios of the GUM and the BIPM standards for air kerma, are 1.0023 with a combined standard uncertainty of 2.4 × 10-3 in 60 Co, and 0.9995 with a combined standard uncertainty of 2.9 × 10-3 in 137 Cs. The result in 60 Co agrees with the direct comparison carried out in 1996 when the new correction factors adopted by the GUM and the BIPM in 2007 and 2009 are applied for the present comparison.