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January-March 1991 Volume 16 | Issue 1
Page Nos. 1-43
Online since Friday, April 24, 2009
Accessed 6,401 times.
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Acceptance Tests For Clinac-1800 : A Dual Photon Medical Linear Accelerator |
p. 1 |
Anil.K Sharma, Sanjay.S Supe, S L Keshava Acceptance tests form an important part of machine installation procedures. Acceptance tests were carried out on CLINAC-1800 accelerator installed at KMIO, as recommended by Varian Associates, U.S.A. in accordance with the German Standard DIN 6847. The tests included radiation survey, mechanical tests, radiation isocenter test, photon beam performance, electron beam performance and dosimetry tests. The results of these acceptance tests were very satisfactory- Tests such as depth dose, field flatness, field symmetry constitute routine quality assurance programme for an accelerator. |
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Postal Quality Assurance Program For Diagnostic Radiology Facilities |
p. 10 |
Vaidy Bala Postal Quality Assurance tests carried out by the Saskatchewan Government's Radiation Safety Unit during the last two years have proven very reliable and economical. This has the potential to identify the performance of rapidly deteriorating X ray tubes and other imaging problems and take prompt corrective action. |
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Measurement Of Scattered Radiation At Tissue Lead Interface In High Energy Electron Beams |
p. 18 |
R C Joshi, T Ganesh, Rajendra Kumar, Sandeep Singhal, G K Rath In electron beam treatment introduction of a metal sheet under the tissue to shield vital organs increases the dose to the tissue at the junction due to the back scattering of electrons from the metal. Investigations were made to observe this effect for electron energies from 9 to 20 MeV. It was found that the increase in the relative ionisation is from 26 to 50 percent at the tissue-lead junction. The range of the back scattered electrons for each electron energy was determined by introducing polystyrene (density = 1.02 gm/cc) and wax sheets between the ionisation chamber and metal. A 1.0 gm per sq. cm thick wax sheet (density = 0.85 gm/cc) reduces the relative ionisation to 101, 102.6, 106.6 and 106% for 9,12,16, and 20 MeV electron beams respectively. |
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Tables For The Normalization Of Time Dose Fractionation Factors For Normal And Tumour Tissues |
p. 21 |
Sanjay Sudhakar Supe, Anil Kumar Sharma |
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System Test As Part Of A Quality Assurance Program For 3D Radiotherapy Planning System |
p. 28 |
D Meenenga, R Boesecke, W Schlegel, W J Lorenz |
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Optimization Of Radiation Dose Distribution By Modulated Irradiation Fields |
p. 31 |
J Burkelbach, T Bortfeld, G Becker, R Boesecke, W Schlegel, W J Lorenz |
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Clinical Experience In Introducing RT Work Stations |
p. 34 |
Torgil Moller, Inger-Lena Lamm |
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Low Dose Exposures And Their Biological Effects |
p. 36 |
Uma.P Devi |
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"The Role Of Computers In Cancer Therapy" |
p. 42 |
R Chidrambaram |
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