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Computation of relative dose distribution and effective transmission around a shielded vaginal cylinder with Ir 192 HDR source using MCNP4B
Author(s) -
Sureka Chandra Sekaran,
Aruna Prakasarao,
Ganesan Singaravelu,
Sunny Chirayath Sunil,
Subbaiah Kamatam Venkata
Publication year - 2006
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2184437
Subject(s) - electromagnetic shielding , shielded cable , materials science , attenuation , cylinder , monte carlo method , optics , nuclear medicine , physics , mathematics , composite material , geometry , medicine , statistics , electrical engineering , engineering
The present work is primarily focused on the estimation of relative dose distribution and effective transmission around a shielded vaginal cylinder with anIr192source using the Monte Carlo technique. The MCNP4B code was used to evaluate the dose distribution around a tungsten shielded vaginal cylinder as a function of thickness and angular shielding. The dose distribution and effective transmission ofIr192by 0.8 cm thickness tungsten were also compared with that for gold and lead. Dose distributions were evaluated for different distances starting from 1.35 cm to 10.15 cm from the center of the cylinder. Dose distributions were also evaluated sequentially from 0 ° to 180 ° for every 5 ° interval. Studies show that all the shielding material at 0.8 cm thickness contribute tolerable doses to normal tissues and also protect the critical organs such as the rectum and bladder. However, the computed dose values are in good agreement with the reported experimental values. It was also inferred that the higher the shielding angles, the more the protection of the surrounding tissues. Among the three shielding materials, gold has been observed to have the highest attenuation and hence contribute lowest transmission in the shielded region. Depending upon the shielding angle and thickness, it is possible to predict the dose distribution using the MCNP4B code. In order to deliver the higher dose to the unshielded region, lead may be considered as the shielding material and further it is highly economic over other materials.