Journal of Medical Physics
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   1989| April-June  | Volume 14 | Issue 2  
    Online since April 24, 2009

 
 
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Penumbral Dose Distribution Of High Energy X-Ray Beam From A medical Linear Accelerator
Ratna Datta, Sobhendranath Datta
April-June 1989, 14(2):5-9
Ionization chamber and solid-state dosimeters have been used to investigate the beam profiles of 6 MV X-ray beams from a medical linear accelerator, with special attention being given in the penumbral region. Measurements were done in water for field sizes from 5 cm x 5 cm to 25 cm x 25 cm and at depths of maximum dose (Dmax) to 15 cm. The field widths at 50% of central axis (CR) dose, measured by diode, were found to be larger than those measured by ion chamber for all field sizes and at all depths, except for field sizes less than 16 cm x 16 cm and at depth of (Dm,). The penumbral widths defined as the distance between 8Q% and 20% of CR dose, measured by diode were sharper than those measured by ion chamber, except for field sizes Larger than 15 cm x 15 cm and at depths greater than 10 cm. Comparison of beam profiles and penumbral widths are Presented.
[ABSTRACT]   Full text not available  [PDF]
  479 69 -
A Comparison Of The Radiation Dose To The Lens Of The Eye From Four Modern C.T. Scanners
L H Sim, C C Case
April-June 1989, 14(2):21-28
A series of measurements of absorbed radiation dose to the lens of the eye, given during certain C.T. examinations was performed. Results obtained demonstrate the variation of dose with technique employed. Four current generation C.T. scanners installed in and around Brisbane were examined in this study. Measurements were made using a small waterproof ionization chamber and a purpose built phantom. The study was undertaken to determine the level of radiation dose delivered to the lens of the eye during certain routine C.T. examinations (i.e. axial orbit) with normally used scanning parameters on a variety of current generation C.T. scanners.
[ABSTRACT]   Full text not available  [PDF]
  479 54 -
Role Of R.S.O In medical Institutions
P H Patel, J M Mahajan
April-June 1989, 14(2):10-17
Full text not available  [PDF]
  302 97 -
Fabrication Of Water Phantom and Measurement Of Central Axis Percentage Depth Dose
S Singh, O P Singh
April-June 1989, 14(2):18-20
Full text not available  [PDF]
  249 74 -
Training In Radiodignosis, Radiotherapy & Nuclear Medicine : Meeting The Need For Technologists In India
Anand Vijay Kumar
April-June 1989, 14(2):29-30
Full text not available  [PDF]
  208 55 -
A Report On The Fourteenth L.H Gray Meeting At New College, Oxford, September 10-15-1988
B S Rao
April-June 1989, 14(2):34-36
Full text not available  [PDF]
  208 37 -
A Report On The Indo-use Conference Under C.M.E Programme In Radiation Oncology
M A Ali
April-June 1989, 14(2):31-33
Full text not available  [PDF]
  196 37 -
 
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