Technical Note: Design and characterization of a large diameter parallel plate ionization chamber for accurate integral depth dose measurements with proton beams

2020 ◽  
Vol 47 (7) ◽  
pp. 3214-3224 ◽  
Author(s):  
Jonathan B. Farr ◽  
Vadim Moskvin ◽  
Renin C. Lukose ◽  
Weiguang Yao ◽  
Frank Schwamm
Keyword(s):  
Ionization Chamber ◽  
Parallel Plate ◽  
Large Diameter ◽  
Technical Note ◽  
Proton Beams ◽  
Depth Dose ◽  
Dose Measurements

TU-D-AUD C-07: Electron Depth Dose Measurements Using a Plastic Scintillation Detector and a Parallel-Plate Ionization Chamber

2008 ◽  
Vol 35 (6Part21) ◽  
pp. 2904-2905
Author(s):  
F Lacroix ◽  
M Guillot ◽  
L Archambault ◽  
L Gingras ◽  
S Beddar ◽  
...  
Keyword(s):  
Scintillation Detector ◽  
Ionization Chamber ◽  
Parallel Plate ◽  
Plastic Scintillation ◽  
Depth Dose ◽  
Plastic Scintillation Detector ◽  
Dose Measurements

scholarly journals The use of fricke dosimetry for low energy x-rays

2006 ◽  
Vol 49 (spe) ◽  
pp. 17-23 ◽  
Author(s):  
Carlos de Austerlitz ◽  
Viviane Souza ◽  
Heldio Pereira Villar ◽  
Aloisio Cordilha
Keyword(s):  
Ionization Chamber ◽  
Parallel Plate ◽  
Low Energy ◽  
Calibration Factor ◽  
X Rays ◽  
Measuring Systems ◽  
X Ray ◽  
Dose Measurements

The performance of four X-ray qualities generated in a Pantak X-ray machine operating at 30-100 kV was determined with a parallel-plate ionization chamber and a Fricke dosimeter. X-ray qualities used were those recommended by Deutsch Internationale Normung DIN 6809 and dose measurements were carried out with Plexiglas® simulators. Results have shown that the Fricke dosimeter can be used not only for soft X-ray dosimetry, but also for the maintenance of low-energy measuring systems' calibration factor.

SU-FF-T-336: Characterization of the Proton Beam of the Centre De Protontherapie D'Orsay with An On Line 2D Parallel Plate Ionization Chamber

2005 ◽  
Vol 32 (6Part12) ◽  
pp. 2028-2028
Author(s):  
S Giordanengo ◽  
A La Rosa ◽  
A Boriano ◽  
F Bourhaleb ◽  
R Cirio ◽  
...  
Keyword(s):  
Proton Beam ◽  
Ionization Chamber ◽  
Parallel Plate ◽  
On Line

scholarly journals A standard Fricke dosimeter compared to an ionization chamber used for dosimetric characterization of 60Co photon beam

2016 ◽  
Vol 22 (2) ◽  
pp. 19-24 ◽  
Author(s):  
Ouiza Moussous ◽  
Toufik Medjadj
Keyword(s):  
Ionization Chamber ◽  
Absorbed Dose ◽  
Photon Beam ◽  
Reference Laboratory ◽  
Depth Dose ◽  
Beam Output ◽  
Output Factors ◽  
Γ Rays ◽  
Cylindrical Ionization Chamber

Abstract The main objective of this study was to investigate the Fricke dosimeter water equivalent system for measurement of dosimetric parameters for photon beam. The parameters measured with the Fricke dosimeter were compared to those obtained with an ionization chamber. In this work characteristics for 60Co γ-rays of field sizes ranging from 5 × 5 cm2 to 20 × 20 cm2 are reported. The measurements were carried out in the secondary standard dosimetry laboratory using a collimated 60Co gamma source therapy unit. The 60Co beam output in terms of absorbed dose to water was obtained as per IAEA TRS 398 recommendations using cylindrical ionization chamber, whose ND,w has been supplied by the IAEA's reference laboratory. Specific quantities measured include: output factors, peak scatter factor, lateral beam profiles and percentage depth dose. The Fricke dosimeters were irradiated in a water phantom using the suitable poly (methyl methacrylate), PMMA stand. Our results demonstrate that Fricke dosimeter and ionization chamber agree with each other.

scholarly journals Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1568 ◽  
Author(s):  
Juan Román-Raya ◽  
Isidoro Ruiz-García ◽  
Pablo Escobedo ◽  
Alberto J. Palma ◽  
Damián Guirado ◽  
...  
Keyword(s):  
Quality Control ◽  
Ionization Chamber ◽  
Low Cost ◽  
Complete Characterization ◽  
Readout System ◽  
Drift Correction ◽  
Ionization Chambers ◽  
The Common ◽  
Dose Measurements

Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors. Currently, ionization chambers and solid-state diodes along with electrometers as readout systems are accomplishing this task. In this work, we present a well-known and low-cost semiconductor sensor, the light-dependent resistor (LDR), as an alternative to the existing sensing devices for dosimetry. To demonstrate this, a complete characterization of the response to radiation of commercial LDRs has been conducted in terms of sensitivity, reproducibility and thermal correction under different bias voltages. Irradiation sessions have been applied under the common conditions in radiotherapy treatments using a hospital linear accelerator. Moreover, the same electrometer used for the ionization chamber has also been successfully used for LDRs. In comparison with the sensitivity achieved for the ionization chamber (0.2 nC/cGy at 400 V bias voltage), higher sensitivities have been measured for the proposed LDRs, ranging from 0.24 to 1.04 nC/cGy at bias voltages from 30 to 150 V, with a reproducibility uncertainty among samples of around 10%. In addition, LDR temperature dependence has been properly modeled using the simple thermistor model so that an easy thermal drift correction of dose measurements can be applied. Therefore, experimental results show that LDRs can be a reliable alternative to dosimetric sensors with the advantages of low size, affordable cost and the fact that it could be adopted with minimal changes in routine dosimetry quality control since the same readout system is fully compatible.

scholarly journals Surface and Buildup Region Dose Measurements with Markus Parallel-Plate Ionization Chamber, GafChromic EBT3 Film, and MOSFET Detector for High-Energy Photon Beams

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Ugur Akbas ◽  
Nazmiye Donmez Kesen ◽  
Canan Koksal ◽  
Hatice Bilge
Keyword(s):  
Ionization Chamber ◽  
Parallel Plate ◽  
Incident Radiation ◽  
High Energy ◽  
Field Size ◽  
Surface Dose ◽  
Photon Beams ◽  
Radiation Beam ◽  
Mosfet Detector ◽  
Dose Measurements

The aim of the study was to investigate surface and buildup region doses for 6 MV and 15 MV photon beams using a Markus parallel-plate ionization chamber, GafChromic EBT3 film, and MOSFET detector for different field sizes and beam angles. The measurements were made in a water equivalent solid phantom at the surface and in the buildup region of the 6 MV and 15 MV photon beams at 100 cm source-detector distance for 5 × 5, 10 × 10, and 20 × 20 cm2field sizes and 0°, 30°, 60°, and 80° beam angles. The surface doses using 6 MV photon beams for 10 × 10 cm2field size were found to be 20.3%, 18.8%, and 25.5% for Markus chamber, EBT3 film, and MOSFET detector, respectively. The surface doses using 15 MV photon beams for 10 × 10 cm2field size were found to be 14.9%, 13.4%, and 16.4% for Markus chamber, EBT3 film, and MOSFET detector, respectively. The surface dose increased with field size for all dosimeters. As the angle of the incident radiation beam became more oblique, the surface dose increased. The effective measurement depths of dosimeters vary; thus, the results of the measurements could be different. This issue can lead to mistakes at surface and buildup dosimetry and must be taken into account.

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