Key comparison BIPM.RI(I)-K3 of the air-kerma standards of the ENEA, Italy and the BIPM in medium-energy x-rays

Burns, D T; Kessler, C; Pinto, Massimo; Cappadozzi, G; Silvestri, Claudio; Toni, M P

doi:10.1088/0026-1394/51/1a/06020

Cited by 3 publications

(7 citation statements)

References 4 publications

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“…All participants had previously participated in the key comparison BIPM.RI(I)-K3 of the airkerma standards of the National Metrology Institutes (NMIs) and the BIPM in mediumenergy X-rays [8][9][10][11]. These results are summarized in table 10.…”

Section: Consistency Check With the Bipmri(i)-k3 Key Comparisonmentioning

confidence: 99%

“…These results are summarized in table 10. [11]. These values were taken for the consistency check because due to time restrictions ENEA did not use its primary standard but the T4 transfer chamber to calibrate the transfer chambers of this comparison.…”

Section: Consistency Check With the Bipmri(i)-k3 Key Comparisonmentioning

confidence: 99%

“…two times each at BIPM, NMI-1 and NMI-2. The relative Type A uncertainties were taken from the K3 reports of the participating NMIs and are listed in table11. The resulting values of u(R cons ) are listed in table 12 together with the values of R cons .…”

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confidence: 99%

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First international comparison of primary absorbed dose to water standards in the medium-energy X-ray range

Büermann¹,

Guerra

Pimpinella

et al. 2016

Metrologia

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This report presents the results of the first international comparison of primary measurement standards of absorbed dose to water for the medium-energy X-ray range. Three of the participants (VSL, PTB, LNE-LNHB) used their existing water calorimeter based standards and one participant (ENEA) recently developed a new standard based on a water-graphite calorimeter. The participants calibrated three transfer chambers of the same type in terms of absorbed dose to water (N Dw ) and in addition in terms of air kerma (N K ) using the CCRI radiation qualities in the range 100 kV to 250 kV. The additional N K values were intended to be used for a physical analysis of the ratios N Dw / N K .

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Section: Consistency Check With the Bipmri(i)-k3 Key Comparisonmentioning

confidence: 99%

Section: Consistency Check With the Bipmri(i)-k3 Key Comparisonmentioning

confidence: 99%

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First international comparison of primary absorbed dose to water standards in the medium-energy X-ray range

Büermann¹,

Guerra

Pimpinella

et al. 2016

Metrologia

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“…The x-ray tube is provided with a 3 mm Be window and can be operated at constant potential up to 450 kV in 0.5 kV steps. This x-ray tube is routinely used at ENEA-INMRI for the calibration of instruments with traceability to the Italian national standard of air kerma for medium-energy x-rays (Burns et al 2014). The realization of the radiation qualities used for the work described in this paper is summarized in table 1.…”

Section: Irradiation Facility and Radiation Qualitiesmentioning

confidence: 99%

“…Table 1. Realization of the 180 kV and 250 kV qualities of the medium-energy x-ray CCRI series (Allisy-Roberts et al 2011) at ENEA-INMRI, adapted from (Burns et al 2014). The beam quality is specified also in terms of the copper half value layer (Cu HVL).…”

Section: Irradiation Facility and Radiation Qualitiesmentioning

confidence: 99%

A graphite calorimeter for absolute measurements of absorbed dose to water: application in medium-energy x-ray filtered beams

et al. 2016

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The Italian National Institute of Ionizing Radiation Metrology (ENEA-INMRI) has designed and built a graphite calorimeter that, in a water phantom, has allowed the determination of the absorbed dose to water in medium-energy x-rays with generating voltages from 180 to 250 kV. The new standard is a miniaturized three-bodies calorimeter, with a disc-shaped core of 21 mm diameter and 2 mm thickness weighing 1.134 g, sealed in a PMMA waterproof envelope with air-evacuated gaps. The measured absorbed dose to graphite is converted into absorbed dose to water by means of an energy-dependent conversion factor obtained from Monte Carlo simulations. Heat-transfer correction factors were determined by FEM calculations. At a source-to-detector distance of 100 cm, a depth in water of 2 g cm(-2), and at a dose rate of about 0.15 Gy min(-1), results of calorimetric measurements of absorbed dose to water, D(w), were compared to experimental determinations, D wK, obtained via an ionization chamber calibrated in terms of air kerma, according to established dosimetry protocols. The combined standard uncertainty of D(w) and D(wK) were estimated as 1.9% and 1.7%, respectively. The two absorbed dose to water determinations were in agreement within 1%, well below the stated measurement uncertainties. Advancements are in progress to extend the measurement capability of the new in-water-phantom graphite calorimeter to other filtered medium-energy x-ray qualities and to reduce the D(w) uncertainty to around 1%. The new calorimeter represents the first implementation of in-water-phantom graphite calorimetry in the kilovoltage range and, allowing independent determinations of D(w), it will contribute to establish a robust system of absorbed dose to water primary standards for medium-energy x-ray beams.

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An Italian InterLaboratory comparison on personal dose equivalent for dosimetry services: promoting measurements reliability and addressing new digital challenges

Iafrati,

Cappadozzi,

Silvestri

et al. 2024

Eur. Phys. J. Plus

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An InterLaboratory Comparison on personal dose equivalent, Hp(10), a fundamental part of radiation protection dosimetry measurements, was organized aiming at evaluating the measurement capability of dosimetry services across Italy, in order to ensure the reliability of the measurements. For the intercomparison, each participant sent their own passive dosimeters, which were exposed to gamma radiation beams emitted from a S-Cs source and to medium-energy filtered X-ray beams of the wide spectrum series, at the ISO 4037-1 W-80 quality. Results were evaluated by applying the statistical estimator R, which compares the communicated dose equivalent values and the reference, assigned values, and then evaluated using trumpet curves. Data were acquired using web forms, collected in internal databases, and processed using statistical software, aiming at the automation of analysis and preparation of technical reporting. Results indicate a good level of maturity in the measurement capabilities in radiation protection dosimetry in the italian dosimetry services who participated. The intercomparison was an opportunity for mutual improvement between the participating dosimetric services and the organizing institute: the former were able to compare themselves and have their capabilities assessed from an external provider; while, the latter had the chance to improve their management and organization skills for a large, multi-lateral intercomparison.

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Key comparison BIPM.RI(I)-K3 of the air-kerma standards of the ENEA, Italy and the BIPM in medium-energy x-rays

Cited by 3 publications

References 4 publications

First international comparison of primary absorbed dose to water standards in the medium-energy X-ray range

First international comparison of primary absorbed dose to water standards in the medium-energy X-ray range

A graphite calorimeter for absolute measurements of absorbed dose to water: application in medium-energy x-ray filtered beams

An Italian InterLaboratory comparison on personal dose equivalent for dosimetry services: promoting measurements reliability and addressing new digital challenges

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