DOSIMETRIC CHARACTERISTIC OF AL2O3 NANODOT® OSL DOSIMETERS FOR THE MEASUREMENT OF EFFECTIVE DOSES IN THE PRESENCE OF ANODE HEEL EFFECT IN PELVIC RADIOGRAPHY

Abstract

ABSTRACT
The Al₂O₃ NanoDot® OSL (OSL) dosimeters is seen as potential internal dosimeter for dosimetry
studies in medical physics. The study focuses on the dosimetry characteristics of OSL dosimeters in
kilovoltage x-ray energies the dosimetry on several organs during pelvic radiography. The anode
heel effects on femoral head, colon, bladder and rectum were measured by using OSL dosimeters based
on the pelvic radiography protocol in an anthropomorphic phantom. The effective dose of the organs
was measured based on the ICRP 60 and 103 reports. The results indicated dose reduction in the
anode side measured by using OSL dosimeter with the percentage difference of 32% compared to
without the anode heel effect. The organ doses were significantly reduced when they were placed at
anode side compared to the cathode side. The total effective dose however showed no significant
change between with and without the application of the anode heel effect. The overall results
indicated the ability of OSL dosimeter to detect dose reduction in organs resulted by the anode
heel effect.

ABSTRAK
Dosimeter Al₂O₃ NanoDot® OSL (OSL) dilihat sebagai dosimeter dalaman yang berpotensi untuk kajian
dosimetri dalam fizik perubatan. Kajian memberi tumpuan kepada ciri dosimetri dosimeter OSL dalam
kilovoltan x-ray memberi tenaga kepada dosimetri pada beberapa organ semasa radiografi pelvis.
Kesan tumit anod pada kepala femoral, kolon, pundi kencing dan rektum diukur dengan menggunakan
dosimeter OSL berdasarkan protokol radiografi pelvis dalam hantu antropomorfik. Dos berkesan organ
diukur berdasarkan laporan ICRP 60 dan 103. Keputusan menunjukkan pengurangan dos di bahagian anod
yang diukur dengan menggunakan dosimeter OSL dengan peratusan perbezaan 32% berbanding tanpa kesan
tumit anod. Dos organ telah dikurangkan dengan ketara apabila ia diletakkan di bahagian anod
berbanding dengan bahagian katod. Jumlah dos berkesan bagaimanapun tidak menunjukkan perubahan
ketara antara dengan dan tanpa penggunaan kesan tumit anod. Keputusan keseluruhan menunjukkan
keupayaan dosimeter OSL untuk mengesan pengurangan dos dalam organ akibat kesan tumit anod.