Determination of percentage depth dose for 6 and 10 MV x-rays using Ge-doped optical fibre and TLD-100.
Percentage depth doses for 6 and 10 MV x-ray beams from a linear accelerator were measured using approximately 1 cm long (approximately 0.3 mg) Ge-doped optical fibre as a thermoluminescence dosimeter for two field sizes, 5 x 5 and 10 x 10 cm2. The results indicate that the Ge-doped optical fibre dosimeter is in good agreement with the results from a PTW 30001 cylindrical ionisation chamber and TLD-100. For 6 MV x-ray beams we observe that the depth of maximum dose d(max) is 1.5 and 2 cm for field sizes of 5 x 5 and 10 x 10 cm2 respectively. For 10 MV d(max) is 2 cm for a field size of 5 x 5 cm2 and 2.5 cm for a 10 x 10 cm2 field.
Abdulla
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YA
Physics Department, University of Malaya, 50603 Kuala Lumpur, Malaysia. shafter40@hotmail.com
Amin
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YM
Khoo
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HB
D005336:Fiber Optic Technology; D005857:Germanium; D008961:Models, Structural; D010315:Particle Accelerators; D011882:Radiotherapy, High-Energy; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation*
D005857:Germanium