Sains Malaysiana 49(8)(2020): 1981-1985

http://dx.doi.org/10.17576/jsm-2020-4908-20

 

Thermoluminescence Dosimetric Characteristics of Fabricated Germanium (Ge) Doped Optical Fibres for Electron Beams Dosimetry: A Preliminary Study

 (Pencirian Dosimeter Pendar Gerlap Terma terhadap Gentian Optik Dop Germanium yang Difabrikasi bagi Pengukuran Dos dalam Pancaran Elektron: Sebuah Kajian Awal)

 

ZABARIAH ZAKARIA1,3, MOHD ZAHRI ABDUL AZIZ2 & NORAMALIZA MOHD NOOR*1,4

 

1Department of Imaging, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

 

2Oncological and Radiological Sciences Cluster, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia (USM), 13200 Bertam, Pulau Pinang, Malaysia

 

3Universiti Kuala Lumpur British Malaysian Institute (UniKL BMI), Bt 8 Jalan Sg Pusu, 53100 Gombak, Selangor Darul Ehsan, Malaysia

 

4Department of Radiology, Hospital Pengajar Universiti Putra Malaysia (HPUPM), Persiaran Mardi-UPM,
43400 Serdang, Selangor Darul Ehsan, Malaysia

 

Diserahkan: 2 Oktober 2019/Diterima: 26 Mac 2020

 

ABSTRACT

The basic dosimetric favourable responses of tailored fabricated germanium (Ge) doped cylindrical optical fibres, make use of 2.3% mol have been extensively studied with clinical electron beams irradiation in terms of dose linearity, reproducibility, fading signals, minimum detectable dose (MDD), energy- and field size dependence. The irradiation was performed at the Radiotherapy Unit, Advanced Medical and Dental Institute (AMDI), which utilizes Elekta Synergy® linear accelerator (LINAC) at 6-, 9-, 12- and 15 MeV electron beam energies at specific doses ranging from 1 to 5 Gy. Thermoluminescence (TL) signals exhibited a linear dose-response overdose ranges, mean reproducibility with a coefficient of variation (CV) of better than 10% and no dependency with different field sizes at p > 0.05. The MDD values were typically 3.51 to 4.13 mGy. The minimum TL fading of the fabricated Ge-doped cylindrical optical fibres was reported favourably for 9 MeV electron beam at day of 74.

 

Keywords: Dose linearity; optical fibres; thermoluminescence (TL)

 

ABSTRAK

Pencirian asas yang sesuai terhadap tindak balas germanium (Ge) dop gentian optik yang berbentuk silinder dengan kepekatan 2.3% mol telah dikaji secara meluas dengan penyinaran pancaran elektron klinikal dari segi kelinearan terhadap dos, kebolehulangan semula, kemerosotan isyarat, kebolehkesanan dos radiasi minimum (MDD) dan kebergantungan kepada saiz medan dan tenaga. Penyinaran ini telah dijalankan di Unit Radioterapi, Insititut Perubatan dan Pergigian Termaju (IPPT) dengan menggunakan pemecut linear Elekta Synergy® dengan tenaga pancaran elektron iaitu 6-, 9-, 12- dan 15 MeV pada dos tertentu dengan penjulatan daripada 1 hingga 5 Gy. Isyarat pendar gerlap terma (TL) telah menunjukkan gerak balas dos yang linear terhadap julat dos, min kebolehulangan semula dengan pekali variasi (CV) lebih baik daripada 10% dan tidak bergantung kepada perbezaan saiz medan pada p > 0.05. Nilai kebolehkesanan dos radiasi minimum biasanya daripada 3.53 hingga 4.13 mGy. Kemerosotan isyarat yang minimum bagi gentian optik telah dilaporkan oleh pancaran elektron yang bertenaga 9 MeV pada hari yang ke-74.

 

Kata kunci: Gentian optik; kelinearan dos; pendar gerlap terma (TL)

RUJUKAN

Amin, M.N., Heaton, R., Norrlinger, B. & Islam, M.K. 2011. Small field electron beam dosimetry using MOSFET detector. Journal of Applied Clinical Medical Physics 12(1): 50-57.

Fadzil, M.S.A., Tamchek, N., Ung, N.M., Ariffin, A., Abdullah, N., Bradley, D.A. & Noor, N.M. 2018. Assessment of thermoluminescence glow curves and kinetic parameters of fabricated ge-doped flat fiber for radiotherapy application. Jurnal Sains Nuklear Malaysia 30(2): 1-14.

Followill, D.S., Hanson, W.F., Ibbott, G.S., Eglezopoulos, L.R. & Chui, C.S. 2003. Differences in electron beam dosimetry using two commercial ionization chambers and the TG-21 protocol: Another reason to switch to TG-51. Journal of Applied Clinical Medical Physics 4(2): 124-131.

Hashim, S., Che Omar, S.S., Ibrahim, S.A., Wan Hassan, W.M.S., Ung, N.M., Mahdiraji, G.A., Bradley, D.A. & Alzimami, K. 2015. Thermoluminescence response of flat optical fiber subjected to 9 MeV electron irradiations. Radiation Physics and Chemistry 106: 46-49.

Hassan, M.F., Rahman, W.W.A., Fadzil, M.A., Tominaga, T., Geso, M., Akasaka, H., Bradley, D.A. & Noor, N.M. 2017. The thermoluminescence response of Ge-doped flat fibre for proton beam measurements: A preliminary study. Journal of Physics: Conference Series 851(1): 1-5.

Lam, S.E., Alawiah, A., Bradley, D.A. & Mohd Noor, N. 2017. Effects of time-temperature profiles on glow curves of germanium-doped optical fibre. Radiation Physics and Chemistry 137: 56-61.

Nascimento, C.R., Asfora, V.K., Gonçalves, J.A.C., Khoury, H.J., Barros, V.S.M., Kalil, L.F. & Bueno, C.C. 2018. The performance of a multi guard ring (MGR) diode for clinical electron beams dosimetry. Applied Radiation and Isotopes 141: 112-117.

Noor, N.M., Fadzil, M.A., Ung, N.M., Maah, M.J., Mahdiraji, G.A., Abdul-Rashid, H.A. & Bradley, D.A. 2016. Radiotherapy dosimetry and the thermoluminescence characteristics of Ge-doped fibres of differing germanium dopant concentration and outer diameter. Radiation Physics and Chemistry 126: 56-61.

Ponmalar, Y.R., Manickam, R., Sathiyan, S., Ganesh, K.M., Arun, R. & Godson, H.F. 2017. Response of nanodot optically stimulated luminescence dosimeters to therapeutic electron beams. Journal of Medical Physics 42(1): 42-47.

Rahman, A.T.A., Bakar, N.K.A., Paul, M.C. & Bradley, D.A. 2014. Ultraviolet radiation (UVR) dosimetry system and the use of Ge-doped silica optical fibres. Radiation Physics and Chemistry 104: 129-133.

Sipilä, P., Ojala, J., Kaijaluoto, S., Jokelainen, I. & Kosunen, A. 2016. Gafchromic EBT3 film dosimetry in electron beams - Energy dependence and improved film read-out. Journal of Applied Clinical Medical Physics 17(1): 360-373.

 

*Pengarang untuk surat-menyurat; email: noramaliza@upm.edu.my

 

 

 

sebelumnya