MO-F-214-03: Calibration of a Reference Standard Ionization Chamber in 6- and 18- MV Photon Beams Using a Sealed Water Calorimeter at Room Temperature

2011 ◽  
Vol 38 (6Part26) ◽  
pp. 3725-3725
Author(s):  
F Bateman ◽  
H Chen-Mayer ◽  
R Tosh
Keyword(s):  
Ionization Chamber ◽  
Room Temperature ◽  
Reference Standard ◽  
Photon Beams

Khảo sát một số đặc tính bức xạ của buồng ion hóa CC13 và diode bán dẫn razor đối với các chùm photon kích thước nhỏ trên máy gia tốc tuyến tính xạ trị Clinac IX

2020 ◽  
Author(s):  
Tu Vu Ngoc
Keyword(s):  
Radiation Field ◽  
Dose Response ◽  
Dose Distribution ◽  
Ionization Chamber ◽  
Field Size ◽  
Photon Beams ◽  
Silicon Diode ◽  
Depth Dose ◽  
The Difference

Purpose: Compare percent depth dose (PDD) and off-center ratio (OCR) measured by the CC13 ionization chamber and the RAZOR silicon diode in small photon beams. Method and Materials: Some dosimetric characteristics, such as PDD, OCR, penumbra and radiation field size, were considered in this study for 2x2, 3x3, and 4x4 cm2 field sizes. We used the CC13 ionization chamber and the RAZOR silicon diode to measure dose distribution with depth along the axis and off-center of the beam. From the results obtained, the team investigated the differences in radiation parameters measured by the two types of probes above. Results: There are significant differences in the radiation parameters investigated for the CC13 ionization chamber and the RAZOR silicon diode, especially the width of penumbra. For PDD curves, the difference is less than 5% from dmax to 30 cm, however the difference becomes greater in the build-up region, which reaches to 33% at the water phatom surface. The width of penumbra measured by CC13 is always larger than that of RAZOR, the ratio of the penumbra width between two detectors is 1.8 and 1.3 for energies of 6 MV and 15 MV, respectively. Conclusion: The RAZOR silicon diode has better dose response than the CC13 ionization chamber for measuring the PDD and the OCR in small photon beams.

Evaluation of Carbon and Oxygen Content of Silicon Wafers Using Infrared Absorption

1980 ◽  
Vol 34 (2) ◽  
pp. 167-171 ◽  
Author(s):  
D. G. Mead ◽  
S. R. Lowry
Keyword(s):  
Fourier Transform ◽  
Oxygen Content ◽  
Infrared Absorption ◽  
Room Temperature ◽  
Fourier Transform Infrared ◽  
Silicon Wafers ◽  
Reference Standard ◽  
Infrared Measurements ◽  
Oxygen Concentrations

Room temperature Fourier transform infrared measurements on some contaminated silicon wafers are presented. Use of subtractive techniques readily allows both carbon and oxygen concentrations of about 0.1 ppm atomic to be obtained in relatively short measurement times (about 1 min), providing an adequate “pure” wafer is used as the reference standard.

Two-dimensional and quasi-three-dimensional dosimetry of hadron and photon beams with the Magic Cube and the Pixel Ionization Chamber

2004 ◽  
Vol 49 (16) ◽  
pp. 3713-3724 ◽  
Author(s):  
R Cirio ◽  
E Garelli ◽  
R Schulte ◽  
S Amerio ◽  
A Boriano ◽  
...  
Keyword(s):  
Ionization Chamber ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Photon Beams ◽  
Magic Cube

Study of the ionization chamber response to flattening-filter-free photon beams

2017 ◽  
Vol 97 ◽  
pp. 47-53 ◽  
Author(s):  
A. Bresolin ◽  
F. Bonfantini ◽  
C.G. Stucchi ◽  
V. Mongioj ◽  
M. Carrara ◽  
...  
Keyword(s):  
Ionization Chamber ◽  
Photon Beams ◽  
Flattening Filter Free ◽  
Flattening Filter

Performance Evaluation of Scintillation Fiber-Optic Dosimeter for Measuring High-Energy Photon Beams

2011 ◽  
Vol 378-379 ◽  
pp. 701-705
Author(s):  
Wook Jae Yoo ◽  
Kyoung Won Jang ◽  
Jin Soo Moon ◽  
Ki Tek Han ◽  
Bong Soo Lee ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Ionization Chamber ◽  
Fiber Optic ◽  
High Energy ◽  
High Energy Photon ◽  
Plastic Optical Fiber ◽  
Photon Beams ◽  
Energy Photon ◽  
Measuring Device ◽  
Radiotherapy Dosimetry

In this study, we have fabricated a fiber-optic dosimeter using an organic scintillator and a plastic optical fiber for measuring percentage depth doses with radiotherapeutic high energy photon beams. The scintillating light generated in an organic dosimeter probe embedded in a solid water phantom is guided by a plastic optical fiber to the light-measuring device. Using this fiber-optic dosimeter, percentage depth doses are measured with 6 and 15 MV energies of photon beams whose field sizes are 2 x 2 and 10 x 10 cm2, and the results are compared with those measured using conventional dosimeters such as an ionization chamber and EBT films used in radiotherapy dosimetry.

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