Sains Malaysiana 46(8)(2017): 1317–1322

http://dx.doi.org/10.17576/jsm-2017-4608-18

 

Response of LiF:Mg,Cu,P TL Detector Simulated with Geant4

(Tindak Balas Pengesan TL LiF:Mg,Cu,P yang Disimulasi Menggunakan Geant4)

 

S. B. SAMAT* & W. PRIHARTI

 

School of Applied Physics, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Received: 17 November 2016/Accepted: 7 February 2017

ABSTRACT

The Geant4 simulation code was developed to study the Hp(10) energy response of the LiF:Mg,Cu,P (TLD-100H). Initial study chose the simulation conditions similar to the work reported by Obryk et al. in year 2011, in which a TLD-100H chip without filter was used. The work went further to simulate the Hp(10) results obtained experimentally at SSDL Malaysia. The experiment used a TLD-100H chip embedded in a TLD card and the card was enclosed in a badge complete with PTFE filter. Irradiation with eleven photon energies in the range of 24-1250 keV was applied. The simulation code therefore took into accounts the details of the badge (the materials type and the dimensions of the chip, the card, the badge and the filters) and the set-up of the experiment (the source distance and the energies). In comparison with Obryk’s work, the simulation code yielded the mean deviation of 0.59%. For the experimental work, the simulated Hp(10) curves obtained were quite similar and comparable and a mean deviation of 13.96% was obtained. As both 0.59% and 13.96% deviations are within the acceptable limit of ±25%, it was concluded that a satisfactory level of accuracy has been achieved by the developed simulation code and the selection materials and physics processes that have been adapted in the code were correct. Sources of uncertainty that has contributed to this deviation are discussed.

 

Keywords: Energy response; Geant4; Hp(10); LiF:Mg,Cu,P; TLD-100H

 

ABSTRAK

Kod simulasi Geant4 dibangunkan untuk mengkaji tindak balas tenaga Hp(10) LiF:Mg,Cu,P (TLD-100H). Kajian awal memilih keadaan simulasi yang sama dengan kertas yang dilaporkan oleh Obryk et al. pada tahun 2011, dengan satu cip TLD-100H tanpa penuras telah digunakan. Penyelidikan ini diteruskan untuk mensimulasi keputusanHp(10) yang diperoleh secara eksperimen di SSDL Malaysia. Eksperimen menggunakan cip TLD-100H dimasukkan ke dalam kad TLD dan kad ini disimpan dalam satu lencana lengkap dengan penuras PTFE. Penyinaran dengan sebelas tenaga foton dalam julat 24-1250 keV digunakan. Kod simulasi telah mengambil kira perincian lencana (jenis bahan dan dimensi cip, kad, lencana dan penuras) serta susunan eksperimen (jarak sumber dan tenaga). Berbanding dengan kerja Obryk, kod simulasi memberikan purata sisihan 0.59%. Untuk kerja eksperimen, lengkok Hp(10) yang disimulasi didapati hampir sama dan boleh dibandingkan, dan purata sisihan 13.96% diperoleh. Kerana kedua-dua sisihan 0.59% dan 13.96% termasuk dalam had penerimaan ±25%, disimpulkan bahawa satu aras ketepatan yang memuaskan telah dicapai oleh kod simulasi yang dibangunkan dan pemilihan bahan dan proses fizik yang diambil dalam kod ini adalah betul. Sumber ketidakpastian yang menyumbang kepada sisihan ini dibincangkan.

 

Kata kunci: Geant4; Hp(10); LiF:Mg,Cu,P; respons tenaga; TLD-100H

 

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*Corresponding author; email: sbsamat@ukm.edu.my