Ariffin, Alawiah
(2015)
Glow Peak Analysis Of Pure And Ge-Doped
Silica Flat Fiber At Ultra High Dose
Electrons.
PhD thesis, Universiti Sains Malaysia.
Abstract
Gentian silika leper (FF), dicadangkan sebagai pengesan asas dan novel bagi
pengukuran sinaran untuk pendarkilau haba (PH) yang dihasilkan. Kajian
ditumpukan kepada kesan tindakbalas PH bagi sampel FF dan keluk nyala bagi PH.
Pemecut Linear (LINAC) digunakan bagi dos dalam julat radioterapi di antara 0.2
Gy-10.0 Gy, manakala pemecut elektron digunakan bagi dos yang teramat tinggi
dalam julat 1 kGy sehingga 1 MGy. Tindakbalas PH terhadap dos, kesan bahan
dopan, kesan kadar pemanasan dan parameter kinetik PH adalah dikaji. Didapati
keluk nyala bagi FF beralih kepada suhu yang lebih tinggi, dengan peningkatan kadar
pemanasan. Parameter kinetik menunjukkan kebergantungan dengan kadar
pemanasan, bagi kedua-dua jenis FF samada tulin atau terdop Ge. Juga didapati
model tenaga, Teori Kaviti Burlin (BCT) boleh digunakan bagi meramalkan
tindakbalas tenaga FF dengan tepat.
Silica flat fiber (FF) is being proposed as the basis for a novel radiation sensor of the
thermoluminescence (TL) produced. The TL performance of the FFs and its
respective glow curves were studied using a linear accelerator (LINAC) delivering
doses of clinical radiotherapy within the range of 0.2-10.0 Gy. An electron
accelerator (Alurtron®) was used to deliver the ultra-high dose. The TL dose
response, dopant effect, heating rate effect and kinetic parameters of the
deconvoluted glow peaks were investigated. The glow curve of FFs shifted to the
higher temperature region as the heating rate increases. The kinetic parameters show
dependence on the heating rate for both doped and un-doped FFs. It is found that the
Burlin Cavity Theory (BCT) fit model can be used to predict the energy response of
FF, accurately.
Actions (login required)
 |
View Item |
![[img]](http://eprints.usm.my/style/images/fileicons/application_pdf.png)
