On the technique of extrapolation to obtain wall correction factors for ion chambers irradiated by photon beams

1990 ◽  
Vol 17 (4) ◽  
pp. 583-587 ◽  
Author(s):  
Alex F. Bielajew
Keyword(s):  
Correction Factors ◽  
Photon Beams ◽  
Ion Chambers

Investigation of field output factors using IAEA-AAPM TRS-483 code of practice recommendations and Monte Carlo simulation for 6 MV photon beams

2021 ◽  
pp. 1-6
Author(s):  
Sumalee Yabsantia ◽  
Sivalee Suriyapee ◽  
Nakorn Phaisangittisakul ◽  
Sornjarod Oonsiri ◽  
Taweap Sanghangthum ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Field Method ◽  
Correction Factors ◽  
Photon Beams ◽  
Small Field Dosimetry ◽  
Code Of Practice ◽  
Edge Detectors ◽  
Output Factors ◽  
Measured Field ◽  
Mc Simulation

Abstract Introduction: This study aims to experimentally determine field output factors using the methodologies suggested by the IAEA-AAPM TRS-483 for small field dosimetry and compare with the calculation from Monte Carlo (MC) simulation. Methods: The IBA-CC01, Sun Nuclear EDGE and IBA-SFD detectors were employed to determine the uncorrected and the corrected field output factors for 6 MV photon beams. Measurements were performed at 100 cm source to axis distance, 10 cm depth in water, and the field sizes ranged from 1 × 1 to 10 × 10 cm2. The use of field output correction factors proposed by the TRS-483 was utilised to determine field output factors. The measured field output factors were compared to that calculated using the egs_chamber user code. Results: The decrease in the percentage standard deviation of the measured three detectors was observed after applying the field output correction factors. Measured field output factors using CC01 and EDGE detectors agreed with MC values within 3% for field sizes down to 1 × 1 cm2, except the SFD detector. Conclusions: The corrected field output factors agree with the calculation from MC, except the SFD detector. CC01 and EDGE are suitable for determining field output factors, while the SFD may need more implementation of the intermediate field method.

scholarly journals Calculated beam quality correction factors for ionization chambers in MV photon beams

2020 ◽  
Vol 65 (7) ◽  
pp. 075003 ◽  
Author(s):  
J Tikkanen ◽  
K Zink ◽  
M Pimpinella ◽  
P Teles ◽  
J Borbinha ◽  
...  
Keyword(s):  
Beam Quality ◽  
Correction Factors ◽  
Photon Beams ◽  
Ionization Chambers

Effective point of measurement of thimble ion chambers in megavoltage photon beams

2009 ◽  
Vol 37 (1) ◽  
pp. 96-107 ◽  
Author(s):  
Frédéric Tessier ◽  
Iwan Kawrakow
Keyword(s):  
Photon Beams ◽  
Ion Chambers

Determination of correction factors for a 2D diode array device in MV photon beams

2009 ◽  
Vol 36 (2) ◽  
pp. 523-529 ◽  
Author(s):  
Xiaodong Zhou ◽  
Stefan Both ◽  
Timothy C. Zhu
Keyword(s):  
Diode Array ◽  
Correction Factors ◽  
Photon Beams
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