Measuring small field profiles and output factors with a stemless plastic scintillator array

To fabricate a 1D stemless plastic scintillation detector (SPSD) array using organic photodiodes and to use the detector to measure small field profiles and output factors. An organic photodiode array was fabricated by spin coating a mixture of P3HT and PCBM organic semiconductors onto an ITO-coated...

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Published inMedical physics (Lancaster) Vol. 49; no. 1; p. 624
Main Authors Hupman, Michael A, Hill, Ian G, Syme, Alasdair
Format Journal Article
LanguageEnglish
Published United States 01.01.2022
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Abstract To fabricate a 1D stemless plastic scintillation detector (SPSD) array using organic photodiodes and to use the detector to measure small field profiles and output factors. An organic photodiode array was fabricated by spin coating a mixture of P3HT and PCBM organic semiconductors onto an ITO-coated glass substrate and depositing aluminum top contacts. Four bulk scintillators of various dimensions were placed on top of the photodiode array. A fifth scintillator was used that had been segmented by laser etching and the septa filled with black paint. Each detector array was first calibrated using a reference field of 95 cm SSD, 5 cm depth, and 10 × 10 cm field size for a 6 MV photon beam. After calibration, profiles were measured for three small field sizes: 0.5 × 0.5 cm , 1 × 1 cm , and 2 × 2 cm . Using the central pixel of the array, output factors were measured for field sizes of 0.5 × 0.5 cm to 25 × 25 cm . Small field profiles were compared to film measurements and output factors compared to ion chamber measurements. The segmented scintillator measured profiles that were in good agreement with film for all three field sizes. Output factors agreed to within 1.2% of ion chamber over the field size range of 1 × 1 cm to 25 × 25 cm . At 0.5 × 0.5 cm the segmented scintillator underestimated the output factor compared to film and a microDiamond detector. Bulk scintillators failed to produce a good agreement with film for measured profiles and deviations from ion chamber for output factors were apparent at field sizes below 5 × 5 cm . In comparison to a bulk scintillator of dimensions 5 × 5 × 0.5 cm the etched scintillator saw a reduction of 5.1, 7.1, and 10.5 times the signal for field sizes of 0.5 × 0.5 cm , 1 × 1 cm , and 2 × 2 cm , respectively. The reduction of signal comes from reduced cross-talk that was present in all of the bulk scintillator geometries to various degrees. A 1D SPSD array was demonstrated with various scintillator designs. The etched scintillator array demonstrated excellent small field profile measurements when compared to film and output factors (down to 1 × 1 cm field size) when compared to micro ion chamber and diamond detector measurements.
AbstractList To fabricate a 1D stemless plastic scintillation detector (SPSD) array using organic photodiodes and to use the detector to measure small field profiles and output factors. An organic photodiode array was fabricated by spin coating a mixture of P3HT and PCBM organic semiconductors onto an ITO-coated glass substrate and depositing aluminum top contacts. Four bulk scintillators of various dimensions were placed on top of the photodiode array. A fifth scintillator was used that had been segmented by laser etching and the septa filled with black paint. Each detector array was first calibrated using a reference field of 95 cm SSD, 5 cm depth, and 10 × 10 cm field size for a 6 MV photon beam. After calibration, profiles were measured for three small field sizes: 0.5 × 0.5 cm , 1 × 1 cm , and 2 × 2 cm . Using the central pixel of the array, output factors were measured for field sizes of 0.5 × 0.5 cm to 25 × 25 cm . Small field profiles were compared to film measurements and output factors compared to ion chamber measurements. The segmented scintillator measured profiles that were in good agreement with film for all three field sizes. Output factors agreed to within 1.2% of ion chamber over the field size range of 1 × 1 cm to 25 × 25 cm . At 0.5 × 0.5 cm the segmented scintillator underestimated the output factor compared to film and a microDiamond detector. Bulk scintillators failed to produce a good agreement with film for measured profiles and deviations from ion chamber for output factors were apparent at field sizes below 5 × 5 cm . In comparison to a bulk scintillator of dimensions 5 × 5 × 0.5 cm the etched scintillator saw a reduction of 5.1, 7.1, and 10.5 times the signal for field sizes of 0.5 × 0.5 cm , 1 × 1 cm , and 2 × 2 cm , respectively. The reduction of signal comes from reduced cross-talk that was present in all of the bulk scintillator geometries to various degrees. A 1D SPSD array was demonstrated with various scintillator designs. The etched scintillator array demonstrated excellent small field profile measurements when compared to film and output factors (down to 1 × 1 cm field size) when compared to micro ion chamber and diamond detector measurements.
Author Hupman, Michael A
Syme, Alasdair
Hill, Ian G
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  organization: Department of Medical Physics, Nova Scotia Health Authority, QEII Health Science Centre, Halifax, Nova Scotia, Canada
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Keywords plastic scintillator
organic photodiode
small field dosimetry
stemless plastic scintillation detector
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Snippet To fabricate a 1D stemless plastic scintillation detector (SPSD) array using organic photodiodes and to use the detector to measure small field profiles and...
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StartPage 624
SubjectTerms Calibration
Diamond
Photons
Plastics
Radiometry
Title Measuring small field profiles and output factors with a stemless plastic scintillator array
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