An ultra-high dose of electron radiation response of Germanium Flat Fiber and TLD-100. (January 2017)

• Record Type: Journal Article
• Authors: Alawiah, A.; Amin, Y.M.; Abdul-Rashid, H.A.; Abdullah, W.S. Wan; Maah, M.J.; Bradley, D.A.
• Is Part Of: Radiation physics and chemistry. Volume 130(2017)
• Page Start: 15
• Page End: 23
• Publication Date: 2017-01
• Subjects: Critical dose limit -- Ultra-high dose -- TL kinetic model -- Supralinearity -- Glow curve -- Glow peak; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2016.07.011
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: The thermoluminescence (TL) response of Germanium Flat Fiber (GFF) and TLD-100 irradiated with 2.5 MeV electrons for the doses up to 1 MGy were studied and compared. The aim was to evaluate the TL supralinearity response at an ultra-high dose (UHD) range and to investigate the change in kinetic parameters of the glow peaks, as the doses increases up to 1 MGy. It is found that the critical dose limit (CDL) of GFF is 5 times higher as compared to TLD-100. CDL is determined by the dose at the maximum supralinearity, f(D) max . It is also found that annealing the TLD-100 and GFF with temperature more than 400 °C is required to reset it back to its original condition, following radiation doses up to 1 MGy. It is also noticed the strange behavior of Peak 4 (TLD-100), which tends to be invisible at the lower dose (<10 kGy) and starts to be appeared at the critical dose limit of 10 kGy. This result might be an important clue to understand the behavior of TLD-100 at extremely high dose range. For both samples, it is observed that the TL intensity is not saturated within the UHD range studied. Highlights: The supralinearity of GFF and TLD-100 was highly dependent on the UHD. The maximum supralinearity f(D)max of TLD-100, occurs around 10 kGy. TL kinetic model can be used to explain the glow peak behavior of doses < f(D)max. The supralinearity response decreases for doses above the critical dose limit.