Absorbed dose estimation using LET dependence in glow curve of thermoluminescent phosphor Li3B7O12:Cu in therapeutic carbon beams. Issue 12 (1st December 2016)

• Record Type: Journal Article
• Authors: Chang, Weishan; Koba, Yusuke; Fukuda, Shigekazu; Wakabayashi, Genichiro; Saitoh, Hidetoshi; Shinsho, Kiyomitsu
• Is Part Of: Journal of nuclear science and technology. Volume 53:Issue 12(2016)
• Page Start: 2028
• Page End: 2033
• Publication Date: 2016-12-01
• Subjects: Thermoluminescence detectors -- thermoluminescence efficiency -- LET -- glow curve -- heavy charged particle therapy -- HTR -- slow heating rate method; Nuclear engineering -- Periodicals; Nuclear physics -- Periodicals; Nuclear energy -- Periodicals; 621.4805
• DOI: 10.1080/00223131.2016.1181010
• Languages: English
• ISSNs: 0022-3131

Abstract

ABSTRACT: A high temperature ratio (HTR) method has been proposed to correct the linear energy transfer (LET) dependence of thermoluminescent (TL) efficiency. To realize the use of the slab-type thermoluminescence detector (TLD) that based on the phosphor Li3 B7 O12 :Cu for heavy charged particle beam, the HTR method has been considered. To improve the reproducibility of HTR, the slow heating rate method is introduced in this report and the coefficient variations of HTR decreased from 10%–20% to 8%. The relation between TL-efficiency, HTR, and LET for Li3 B7 O12 :Cu was manifested and the TL-efficiency as a function of HTR was derived in an attempt to measure the absorbed dose without LET information. The feasibility of the HTR method in therapeutic carbon beams was evaluated by comparing the dose estimated by Li3 B7 O12 :Cu and by an ionization chamber. The accuracy of dose estimation in carbon beams was improved by using the HTR method, but there is room for further improvement. The use of Li3 B7 O12 :Cu in heavy charged particle beams can be materialized with further improvement of HTR sensitivity.