EURAMET i DOSEtrace project and supplementary comparison

Tačna i sledljiva merenja operativnih veličina su neophodna za adekvatnu zaštitu od zračenja. Nacionalni metrološki instituti i Imenovani instituti su zaduženi za diseminaciju SI jedinice Sivert i za etaloniranje korisničke opreme. Ipak, u velikom broju Evropskih zemalja, mogušnosti etaloniranjaza operativne veličine su nedovoljno razvijene ili nepostoješe. Glavni cilj DOSEtrace projekta je unapređenje ovih mogućnosti, kao i smanjenje proširene merne nesigurnosti učesnika projekta ispod 5 % (k = 2). U okviru projekta še biti sprovedena Dodatna interkomparacija kalibracionih faktora za ambijentalni dozni ekvivalent. Ova interkomparacija še pomoši učesnicima projekta da validiraju merne mogušnosti razvijene pre i tokom projekta, a takođe će pomoći novim institutima da steknu međunarodno priznanje. U okviru intercomparacije, biše pokriveni kvaliteti zračenja radionuklida, kao i x-zračenja.Accurate and traceable measurements of operational quantities are required for adequate radiation protection. National Measurement Institutes (NMI) and Designated Institutes (DI) are responsible for disseminating the SI unit sievert and for calibrating user equipment. However, in many emerging European countries, calibration and measurement capabilities for operational quantities are limited or nonexistent. The main objective of DOSEtrace project is to improve these capabilities and for the participants to achieve the expanded measurement uncertainty of less than5% (k = 2). Within the project, a Supplementary comparison of calibration factors in terms of ambient dose equivalent will be conducted. This comparison will help to validate the capabilities that the partners developed during and before the project and will help emerging institutes gain international recognition. The comparison will cover both radionuclide and x-ray radiation qualities according to ISO 4037-1.Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681]XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србиј

EURAMET Dosetrace projekat i dodatna interkomparacija

Accurate and traceable measurements of operational quantities are required for adequate radiation protection. National Measurement Institutes (NMI) and Designated Institutes (DI) are responsible for disseminating the SI unit sievert and for calibrating user equipment. However, in many emerging European countries, calibration and measurement capabilities for operational quantities are limited or nonexistent. The main objective of DOSEtrace project is to improve these capabilities and for the participants to achieve the expanded measurement uncertainty of less than 5% (k = 2). Within the project, a Supplementary comparison of calibration factors in terms of ambient dose equivalent will be conducted. This comparison will help to validate the capabilities that the partners developed during and before the project and will help emerging institutes gain international recognition. The comparison will cover both radionuclide and x-ray radiation qualities according to ISO 4037-1.Taţna i sledljiva merenja operativnih veliţina su neophodna za adekvatnu zaštitu od zraţenja. Nacionalni metrološki instituti i Imenovani instituti su zaduţeni za diseminaciju SI jedinice Sivert i za etaloniranje korisniţke opreme. Ipak, u velikom broju Evropskih zemalja, mogušnosti etaloniranja za operativne veliţine su nedovoljno razvijene ili nepostoješe. Glavni cilj DOSEtrace projekta je unapreŤenje ovih mogušnosti, kao i smanjenje proširene merne nesigurnosti uţesnika projekta ispod 5 % (k = 2). U okviru projekta še biti sprovedena Dodatna interkomparacija kalibracionih faktora za ambijentalni dozni ekvivalent. Ova interkomparacija še pomoši uţesnicima projekta da validiraju merne mogušnosti razvijene pre i tokom projekta, a takoŤe še pomoši novim institutima da steknu meŤunarodno priznanje. U okviru intercomparacije, biše pokriveni kvaliteti zraţenja radionuklida, kao i x-zraţenja.XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2-4. октобар 2019. годин

EURAMET i DOSEtrace project and supplementary comparison

Tačna i sledljiva merenja operativnih veličina su neophodna za adekvatnu zaštitu od zračenja. Nacionalni metrološki instituti i Imenovani instituti su zaduženi za diseminaciju SI jedinice Sivert i za etaloniranje korisničke opreme. Ipak, u velikom broju Evropskih zemalja, mogušnosti etaloniranjaza operativne veličine su nedovoljno razvijene ili nepostoješe. Glavni cilj DOSEtrace projekta je unapređenje ovih mogućnosti, kao i smanjenje proširene merne nesigurnosti učesnika projekta ispod 5 % (k = 2). U okviru projekta še biti sprovedena Dodatna interkomparacija kalibracionih faktora za ambijentalni dozni ekvivalent. Ova interkomparacija še pomoši učesnicima projekta da validiraju merne mogušnosti razvijene pre i tokom projekta, a takođe će pomoći novim institutima da steknu međunarodno priznanje. U okviru intercomparacije, biše pokriveni kvaliteti zračenja radionuklida, kao i x-zračenja.Accurate and traceable measurements of operational quantities are required for adequate radiation protection. National Measurement Institutes (NMI) and Designated Institutes (DI) are responsible for disseminating the SI unit sievert and for calibrating user equipment. However, in many emerging European countries, calibration and measurement capabilities for operational quantities are limited or nonexistent. The main objective of DOSEtrace project is to improve these capabilities and for the participants to achieve the expanded measurement uncertainty of less than5% (k = 2). Within the project, a Supplementary comparison of calibration factors in terms of ambient dose equivalent will be conducted. This comparison will help to validate the capabilities that the partners developed during and before the project and will help emerging institutes gain international recognition. The comparison will cover both radionuclide and x-ray radiation qualities according to ISO 4037-1.Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681]XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србиј

Personal Dosimetry in Pulsed Photon Fields with the Dosepix Detector

First investigations regarding dosimetric properties of the hybrid, pixelated, photon-counting Dosepix detector in a pulsed photon field (RQR8) for the personal dose equivalent $H\mathrm{_p(10)}$ are presented. The influence quantities such as pulse duration and dose rate were varied, and their responses were compared to the legal limits provided in PTB-A 23.2. The variation of pulse duration at a nearly constant dose rate of 3.7$\,$Sv/h shows a flat response around 1.0 from 3.6$\,$s down to 2$\,$ms. A response close to 1.0 is achieved for dose rates from 0.07$\,$mSv/h to 35$\,$Sv/h for both pixel sizes. Above this dose rate, the large pixels (220$\,\mathrm{\mu}$m edge length) are below the lower limit. The small pixels (55$\,\mathrm{\mu}$m edge length) stay within limits up to 704$\,$Sv/h. The count rate linearity is compared to previous results, confirming the saturating count rate for high dose rates.Comment: 6 pages, 3 figures. This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessibl

GuideRadPROS: Updating the basis of radiation protection dosimetry by harmonization, update and implementation of standards

Purpose: The recent update of the ISO 4037, in conjunction with the new radiation protection quantities introduced in ICRU Report 95, present significant challenges to calibration laboratories and industry. Furthermore, there is a need to address gaps and conflicts between standards that set requirements for photon dosimeters, and to incorporate upcoming and new technologies into standardization. Materials and Methods: The European Partnership Project 23NRM07 GuideRadPROS started in June 2023 and will address these issues in the next three years. The objectives are: • to develop harmonized X-ray spectrometry in accordance with the ISO 4037 standard series, evaluate discrepancies between measured and calculated half value layer of X-ray spectra, and produce data to update requirements for reference X-ray fields. • to develop guidance for the calibration of dosimeters. • to produce guidance on validated procedures for harmonized type testing based on IEC standards. • to assess future standardization needs and to produce a guidance document for the implementation of the new operational quantities of ICRU Report 95 into standards and regulations. • to collaborate with ISO and IEC and users of their dosimetry standards to ensure that project outputs align with their needs. Results: The outcome of this project will lead to improved and comparable procedures in calibration and type testing within Europe. Furthermore, the evaluation of the impact of the ICRU Report 95 quantities will allow for an informed realization of calibration fields. Conclusions: GuideRadPROS will improve the confidence in radiation protection dosimetry, both via the promotion of the implementation of the ISO 4037 standard series, and via the assessment of the impact of the ICRU Report 95 operational quantities on daily measurements in radiation protection.ERPW 2023 - European Radiation Protection Week, 9-13th October 2023, Dublin, Irelan

What Is Worth Knowing in Interventional Practices about Medical Staff Radiation Exposure Monitoring: A Review of Recent Outcomes of EURADOS Working Group 12

EURADOS (European Radiation Dosimetry Group) Working Group 12 (WG12) SG1 activities are aimed at occupational radiation protection and individual monitoring in X-ray and nuclear medicine practices. In recent years, many studies have been carried out in these fields, especially for interventional radiology and cardiology workplaces (IC/IR). The complexity of the exposure conditions of the medical staff during interventional practices makes the radiation protection and monitoring of the exposed workers a challenging task. The scope of the present work is to review some of the main results obtained within WG12 activities about scattered field characterization and personal dosimetry that could be very useful in increasing the quality of radiation protection of the personnel, safety, and awareness of radiation risk. Two papers on Monte Carlo modelling of interventional theater and three papers on active personal dosimeters (APDs) for personnel monitoring were considered in the review. More specifically, Monte Carlo simulation was used as the main tool to characterize the levels of exposure of the medical staff, allowing to determine how beam energy and direction can have an impact on the doses received by the operators. Indeed, the simulations provided information about the exposure of the operator’s head, and the study concluded with the determination of an eye-lens protection factor when protection goggles and a ceiling shielding are used. Moreover, the review included the results of studies on active personal dosimeters, their use in IC/IR workplaces, and how they respond to calibration fields, with X-ray standard and pulsed beams. It was shown that APDs are insensitive to backscatter radiation, but some of them could not respond correctly to the very intense pulsed fields (as those next to the patient in interventional practices). The measurements during interventional procedures showed the potential capability of the employment of APDs in hospitals

Recommendations for the use of active personal dosemeters (APDs) in interventional workplaces in hospitals

Occupational radiation doses from interventional procedures have the potential to be relatively high. The requirement to optimise these doses encourages the use of electronic or active personal dosimeters (APDs) which are now increasingly used in hospitals. They are typically used in tandem with a routine passive dosimetry monitoring programme, with APDs used for real-time readings, for training purposes and when new imaging technology is introduced. However, there are limitations when using APDs. A survey in hospitals to identify issues related to the use of APDs was recently completed, along with an extensive series of APD tests by the EURADOS Working Group 12 on Dosimetry for Medical Imaging. The aim of this review paper is to summarise the state of the art regarding the use of APDs. We also used the results of our survey and our tests to develop a set of recommendations for the use of APDs in the clinical interventional radiology/cardiology settings, and draw attention to some of the current challenges

Measurement of the cross-section and charge asymmetry of WW bosons produced in proton-proton collisions at s=8\sqrt{s}=8 TeV with the ATLAS detector

This paper presents measurements of the $W^+ \rightarrow \mu^+\nu$ and $W^- \rightarrow \mu^-\nu$ cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton--proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of 20.2~\mbox{fb^{-1}}. The precision of the cross-section measurements varies between 0.8% to 1.5% as a function of the pseudorapidity, excluding the 1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.Comment: 38 pages in total, author list starting page 22, 5 figures, 4 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-13

Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in √s=13 TeV pp collisions with the ATLAS detector

A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell W and Z bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of √s=13  TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fb−1. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015–2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full data set are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at the 95% confidence level on simplified models of chargino-neutralino pair production for masses up to 345 GeV