Development of a motorized system for the characterization of the RQR reference x-ray beams at the KFSHRC's SSDL using an extrapolation chamber

M Arib; R Ayad; H Alhamdan; M Ababtain; A Aldosari; K Alnahdi; S Alfadhli; A Suliman; A A Alatawi

doi:10.1016/j.apradiso.2023.111064

Development of a motorized system for the characterization of the RQR reference x-ray beams at the KFSHRC's SSDL using an extrapolation chamber

Appl Radiat Isot. 2023 Dec:202:111064. doi: 10.1016/j.apradiso.2023.111064. Epub 2023 Oct 5.

Authors

M Arib¹, R Ayad², H Alhamdan³, M Ababtain⁴, A Aldosari³, K Alnahdi², S Alfadhli², A Suliman², A A Alatawi²

Affiliations

¹ King Faisal Specialist Hospital & Research Center (KFSHRC), Riyadh, Kingdom of Saudi Arabia. Electronic address: marib@kfshrc.edu.sa.
² University of Tabuk, Kingdom of Saudi Arabia.
³ King Faisal Specialist Hospital & Research Center (KFSHRC), Riyadh, Kingdom of Saudi Arabia.
⁴ University of Freiburg, Germany.

PMID: 37866227
DOI: 10.1016/j.apradiso.2023.111064

Abstract

An extrapolation chamber of type Böhm 23392, used for the dosimetry of RQR beam qualities at the Secondary Standard Dosimetry Laboratory of King Faisal Specialist Hospital, is presented. A computer-based motorized system consisting of a stepping motor coupled to the chamber's built-in micrometer screw was designed to expedite the measurements process, giving a linear relationship between the number of motor steps and the chamber depth with a Coefficient of Determination (COD) equal to 0.9990. The extrapolation chamber along with the motorized system was used to determine the extrapolation curves. The slope of the extrapolation curves, measured for the eight RQR beam qualities with a relative uncertainty between 0.17% and 0.58%, varies linearly with the beam quality expressed in terms of HVL, with a COD between 0.9995 and 1.0000.