Direct measurement of absorbed dose to water in HDR I192r brachytherapy: Water calorimetry, ionization chamber, Gafchromic film, and TG-43

2010 ◽  
Vol 37 (4) ◽  
pp. 1924-1932 ◽  
Author(s):  
Arman Sarfehnia ◽  
Iwan Kawrakow ◽  
Jan Seuntjens
Keyword(s):  
Direct Measurement ◽  
Ionization Chamber ◽  
Absorbed Dose ◽  
Gafchromic Film ◽  
Absorbed Dose To Water

scholarly journals Calibration of Therapy Level Ionization Chamber at 60Co Teletherapy Beam Used for Radiation Therapy

2018 ◽  
Vol 79 ◽  
pp. 1-8
Author(s):  
Md. Ali Reza ◽  
Md. Rakibul Islam ◽  
Md. Shakilur Rahman ◽  
Md. Shamsuzzaman ◽  
Md. Rashedur Rahman ◽  
...  
Keyword(s):  
Ionization Chamber ◽  
Absorbed Dose ◽  
Critical Issue ◽  
Calibration Factor ◽  
Ionization Chambers ◽  
Depth Dose ◽  
Output Factors ◽  
Absorbed Dose To Water ◽  
Radiotherapy Dosimetry ◽  
Water Measurement

The accuracy and traceability of absorbed dose to water measurement of radiotherapy beam is a critical issue to achieve the curative outcome of cancer patients. The current dosimetry protocols for radiotherapy beams TRS-398, TG-51 and DIN-6800-2 are based on the calibration factor of ionization chamber in terms of absorbed dose to water for 60Co beam. The accuracy of the calibration factor of ionization chamber as well as output of radiotherapy beam is the primary requirements of precisional dose deliver to the tumor which is the QA part of radiotherapy dosimetry. In the present study, we have calibrated 9 different ionization chambers (8 thimbles and 1 parallel plate) of various active volumes for 60Co beam against reference standard NE2571 and compared with manufacturer’s values. The Percentage Depth Dose (PDD) and Output Factors (OF) of two cobalt units were measured with standard calibration system by following IAEA dosimetry protocol TRS-398 and compare with 6 MV photon beam from medical linear accelerator. The traceability of the dosimetry was verified by the participation of postal dose IAEA/WHO intercomparison program. The aim of the participation was to investigate uncertainties involved in the calibration of Ionization Chamber (IC) and absorbed dose measurement. The percentage of deviation relative to IAEA mean dose was found to be -0.2% (traceable limit ±5%), which shows an excellent agreement of calibration of beam as well as ionization chamber with international standard. The deviation of factors of ionization chambers between the measured and manufacturer’s values were found within 0.07-2.81% with an uncertainty of ±1.5% (k=1).

Performance evaluation of graphite pancake ionization chamber by comparing the absorbed dose to water calibration

2006 ◽  
Vol 41 (3) ◽  
pp. 306-316 ◽  
Author(s):  
J.H. Lee ◽  
C.Y. Lin ◽  
C.F. Wang ◽  
D.J. Butler ◽  
D.V. Webb ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Ionization Chamber ◽  
Absorbed Dose ◽  
Absorbed Dose To Water

SU-E-T-102: Measurement of Absorbed Dose-To-Water for An HDR Ir-192 Source with a Farmer Ionization Chamber in a Sandwich Setup

2013 ◽  
Vol 40 (6Part12) ◽  
pp. 227-227
Author(s):  
F Araki ◽  
T Kouno ◽  
T Ohno ◽  
S Kawamura ◽  
K Kakei
Keyword(s):  
Ionization Chamber ◽  
Absorbed Dose ◽  
Absorbed Dose To Water

Direct measurement of ionization chamber absorbed dose k factors in clinical electron beams

2020 ◽  
Vol 139 ◽  
pp. 106481
Author(s):  
Zhipeng Wang ◽  
Shuming Xing ◽  
Kun Wang ◽  
Sunjun Jin ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Direct Measurement ◽  
Ionization Chamber ◽  
Electron Beams ◽  
Absorbed Dose
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