Method of deriving the response curve of an ionisation chamber from experimental values of its air kerma calibration coefficients measured in standardised X-ray beams

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652052%3A_____%2F25%3AN0000025" target="_blank" >RIV/86652052:_____/25:N0000025 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S1350448725001179" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S1350448725001179</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.radmeas.2025.107488" target="_blank" >10.1016/j.radmeas.2025.107488</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Method of deriving the response curve of an ionisation chamber from experimental values of its air kerma calibration coefficients measured in standardised X-ray beams

Popis výsledku v původním jazyce

Air-equivalent ionisation chambers are the reference instruments for measuring air kerma in dosimetry calibration laboratories. The energy dependence of the response of a given ionisation chamber is usually characterised by a discrete set of values of its air kerma calibration coefficients, NK,a, measured in standardised photon beams. For photon energies below 300 keV, the most commonly used standardised calibration beams are the X-ray beams, i.e. beams with continuous spectra. The energy dependence of a given ionisation chamber could alternatively be characterised by the response function fIK(E) which describes the dependence of the magnitude of the electrical response of the chamber on the photon energy, E, at a constant air kerma rate. In practice, this method of characterising the energy dependence of the ionisation chamber response is rarely used because monoenergetic calibration photon beams covering the above mentioned energy range are not routinely available and it is therefore difficult to measure the response function fIK(E) experimentally. In this work, we show that: a) the response function fIK(E) of a given ionisation chamber can be derived from the values of its air kerma calibration coefficients, NK,a, measured in standardised X-ray calibration beams; b) the proposed method can reveal possible internal inconsistencies in the set of air kerma calibration coefficients, NK,a, of an ionisation chamber; c) the response function fIK(E) of a given ionisation chamber derived from a set of its NK,a values can be used to predict the NK,a values of the chamber for other X-ray beams.

Název v anglickém jazyce

Method of deriving the response curve of an ionisation chamber from experimental values of its air kerma calibration coefficients measured in standardised X-ray beams

Popis výsledku anglicky

Air-equivalent ionisation chambers are the reference instruments for measuring air kerma in dosimetry calibration laboratories. The energy dependence of the response of a given ionisation chamber is usually characterised by a discrete set of values of its air kerma calibration coefficients, NK,a, measured in standardised photon beams. For photon energies below 300 keV, the most commonly used standardised calibration beams are the X-ray beams, i.e. beams with continuous spectra. The energy dependence of a given ionisation chamber could alternatively be characterised by the response function fIK(E) which describes the dependence of the magnitude of the electrical response of the chamber on the photon energy, E, at a constant air kerma rate. In practice, this method of characterising the energy dependence of the ionisation chamber response is rarely used because monoenergetic calibration photon beams covering the above mentioned energy range are not routinely available and it is therefore difficult to measure the response function fIK(E) experimentally. In this work, we show that: a) the response function fIK(E) of a given ionisation chamber can be derived from the values of its air kerma calibration coefficients, NK,a, measured in standardised X-ray calibration beams; b) the proposed method can reveal possible internal inconsistencies in the set of air kerma calibration coefficients, NK,a, of an ionisation chamber; c) the response function fIK(E) of a given ionisation chamber derived from a set of its NK,a values can be used to predict the NK,a values of the chamber for other X-ray beams.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Radiation Measurements

ISSN

1350-4487

e-ISSN

1879-0925

Svazek periodika

187

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

107488

Kód UT WoS článku

001539846500001

EID výsledku v databázi Scopus

2-s2.0-105011164692