Dependence of photon registration efficiency on LaBr3(Ce) detector orientation for in situ radionuclide monitoring

Lukasz Modzelewski; Slawomir Jednorog; Katarzyna Woloszczuk; Pawel Krajewski; Lukasz Mazur; Bartlomiej Klis; Zuzanna Baranowska; Alicja Jakubowska; Maciej Norenberg; Anna Kawalec; Witold Skrzynski

doi:10.1016/j.apradiso.2021.109974

Dependence of photon registration efficiency on LaBr₃(Ce) detector orientation for in situ radionuclide monitoring

Appl Radiat Isot. 2021 Dec:178:109974. doi: 10.1016/j.apradiso.2021.109974. Epub 2021 Oct 2.

Authors

Affiliations

¹ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: modzelewski@clor.waw.pl.
² Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: s.jednorog@clor.waw.pl.
³ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: woloszczuk@clor.waw.pl.
⁴ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: krajewski@clor.waw.pl.
⁵ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: l.mazur@clor.waw.pl.
⁶ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: b.klis@clor.waw.pl.
⁷ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: z.baranowska@clor.waw.pl.
⁸ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: a.jakubowska@clor.waw.pl.
⁹ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: m.norenberg@clor.waw.pl.
¹⁰ Central Laboratory for Radiological Protection, Konwaliowa 7 Str., 03-194, Warsaw, Poland. Electronic address: a.kawalec@clor.waw.pl.
¹¹ The Maria Sklodowska-Curie National Research Institute of Oncology, Roentgena 5 Str., 02-781, Warsaw, Poland. Electronic address: witold.skrzynski@pib-nio.pl.

PMID: 34653881
DOI: 10.1016/j.apradiso.2021.109974

Abstract

Knowledge of a radiation detector's numerical characteristics allows its energy efficiency to be calibrated theoretically for any measurement geometry. Here, energy efficiency calibration is discussed for oriented LaBr₃(Ce) detectors used for in situ radiation monitoring. Vertical and horizontal detector orientations relative to the ground surface are compared using efficiency calibrations based on the detector's numerical characteristics and are equally effective. Quantitative assessment of the different measurement geometries was performed using a new analytical approach: integrated absolute full energy peak efficiency.

Keywords: Energy efficiency calibration; In situ spectrometry; Integrated absolute full energy peak efficiency; LaBr(3)(Ce) detector; Radiation monitoring.