Deliverable D6: Good Practice Guide on the characterisation and calibration of detectors for 3D dose distribution measurements close to eBT devices. This will include guidance to achieve the following target uncertainties (k = 1): 1 % - 2 % (NMIs) and 2 % - 3 % (clinic) for the scintillation detectors and for the small volume ionisation chambers, 3.5 % for the gel dosimeter (considering a dose around 20 Gy) and 2.5 % for the alanine pellets.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F23%3AN0000085" target="_blank" >RIV/00177016:_____/23:N0000085 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Deliverable D6: Good Practice Guide on the characterisation and calibration of detectors for 3D dose distribution measurements close to eBT devices. This will include guidance to achieve the following target uncertainties (k = 1): 1 % - 2 % (NMIs) and 2 % - 3 % (clinic) for the scintillation detectors and for the small volume ionisation chambers, 3.5 % for the gel dosimeter (considering a dose around 20 Gy) and 2.5 % for the alanine pellets.

Original language description

Currently, most commercial electronic brachytherapy (eBT) low energy X-ray systems rely on specific calibration tools and procedures to verify the absorbed dose to water close to the eBT sources. It is therefore difficult to adopt clinically established treatment plans from one eBT system to another, which impedes progress in this modality of radiotherapy. This Good Practice Guide (GPG) summarises the characterisation and calibration of different radiation detectors within the framework of the EMPIR project PRISM-eBT. The dosimeters investigated in this project were all small enough to be used as point detectors in steep dose gradients close to eBT sources. A thorough characterisation of the dosimeters required the measurement of different properties, for example the energy response as a function of X-ray energies in the low keV energy range typical for eBT applications, as well as any dose, dose rate or angular dependence. Once calibrated, the dosimeters can be used to determine the 3D dose distributions in water within a few centimetres from bare eBT sources or the surfaces of typical eBT applicators. The results summarised in this GPG can form the basis to develop a standardised traceable calibration procedure for these detectors with the aim to reduce the uncertainties in dose, dose distribution and dose-effect relations to a level recommended, for instance, in the International Atomic Energy Agency (IAEA) Human Health Report No. 31 (IAEA 2016).

Czech name

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Czech description

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Type

V_souhrn - Summary research report

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

<a href="/en/project/8B19003" target="_blank" >8B19003: Primary standards and traceable measurement methods for X-ray emitting electronic brachytherapy devices</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Number of pages

42

Place of publication

PTB Branschweig, Německo

Publisher/client name

EURAMET

Version

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