Malaysian Journal of Analytical Sciences Vol 22 No 2 (2018): 303 - 310

EVALUATION OF DOSE SENSITIVITY RESPONSE VIA OPTICAL CHARACTERISTICS FOR CRESOL RED-DYED POLYHYDROXYETHYLMETHACRYLATE GEL (PHEMAG)

(Penilaian Respons Kepekaan Dos Melalui Ciri Optikal Bagi Kresol Merah-Dicelup Polihidrosietilmetakrilik Gel (PHEMAG))

Nur Sha’adah Zainuddin¹*, Fairuzdzah Ahmad Lothfy¹, Hartini Ahmad Rafaie¹, Mazlini Mazlan², Iskandar Shahrim Mustafa³, Azhar Abdul Rahman³

¹Faculty of Applied Sciences,

Universiti Teknologi MARA Pahang, 26400 Bandar Tun Abdul Razak Jengka, Pahang, Malaysia

²Faculty of Applied Sciences,

Universiti Teknologi MARA Tapah, 35400 Tapah, Perak, Malaysia

³School of Physics,

Universiti Sains Malaysia, 11800 Minden, Pinang, Malaysia

*Corresponding author: nsz@pahang.uitm.edu.my

Received: 4 December 2016; Accepted: 1 December 2017

Abstract

A new polymer gel blended with the acid base indicator of cresol red were prepared consisted of 4%, 5% and 6% of monomer (2-Hydroxyethyl Methacrylate; HEMA) in order to characterize the radiation induced changes known as cresol red Polyhydroxyethylmethacrylate Gel (PHEMAG). Cresol red-dyed PHEMAG were prepared consisted of gelatin, deionized water, HEMA, cresol red sodium salt stock solution and ascorbic acid. The polymerization Cresol red-PHEMAG was studied with 6 MV photon beam rates 300 Gy/min which received doses up to 40 Gy for the reveletion sensitivity as a function of absorbed dose based on the physical properties by using UV-Vis spectroscopy. It is indicated that 4% of HEMA exhibited a greater sensitivity of the polymer gel dosimeter based on a mathematical model of the fitting equation of the dose response curve. The value of D_o (sensitivity parameter) for 4% of HEMA is the lowest about 42.373 Gy. The lower value of D_o would cause the higher radiosensitive of the matter which was actively reacted at the time of exposure.

Keywords: absorbed dose, cresol red, photon beam, polymer gel

Abstrak

Gel polimer baru dicampur dengan penunjuk asas asid kresol merah telah disediakan yang terdiri daripada 4%, 5% dan 6% daripada monomer (2- hidrosietilmetakrilik; HEMA) untuk mencirikan radiasi mendorong perubahan yang dikenali sebagai Kresol merah-dicelup Polihidrosietilmetakrilik Gel (PHEMAG). Kresol merah – dicelup PHEMAG telah dihasilkan terdiri daripada gelatin, air nyah ion, HEMA, stok larutan kresol merah natrium garam dan asid askobik. Pempolimeran kresol merah PHEMAG telah dikaji dengan pancaran foton 6 MV pada kadar yang berterusan 300 Gy/min yang menerima dos sehingga 40 Gy untuk mendedahkan kepekaan sebagai fungsi dos terserap berdasarkan sifat-sifat fizikal dengan menggunakan spektroskopi UV-Vis. Ia menunjukkan bahawa 4% daripada HEMA menghasilkan kepekaan polimer gel dosimeter yang lebih tinggi berdasarkan model persamaan matematik sesuai tindak balas dos keluk. Nilai D_o (parameter sensitiviti) untuk 4% daripada HEMA adalah yang paling rendah kira-kira 42.37 Gy. Nilai yang lebih rendah daripada D_oakan menyebabkan radiosensitif jisim yang bertindak balas secara aktif pada masa pendedahan.

Kata kunci: dos terserap, kresol merah, pancaran foton, gel polimer

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