Thin‐film CdTe detector for microdosimetric study of radiation dose enhancement at gold‐tissue interface

Paudel, Naba R.; Shvydka, Diana; Parsai, E

doi:10.1120/jacmp.v17i5.6339

Cited by 4 publications

(11 citation statements)

References 22 publications

(25 reference statements)

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“…In that system, the detector is a wireless array, allowing the dosimetric characteristics of 6 MV and kV X‐ray beams to be evaluated. The detection efficiency of a‐Si thin‐film solar cells is low because Z and electron density are low compared with CdTe 20 . The energy conversion efficiency of a‐Si thin‐film solar cells can be increased by using a thin scintillating material, which can result in an amplified signal compared with the signal of the solar cell alone.…”

Section: Introductionmentioning

confidence: 99%

“…Flexible thin‐film solar cells are types of semiconductor detectors that can be used in a simple setup because these cells do not require devices such as photomultiplier tubes. The second generation of cadmium telluride (CdTe) thin‐film solar cells, combined with metal plates (e.g., copper), have sufficiently high atomic number and electron density to improve quantum efficiency 17–20 . Therefore, CdTe photovoltaic devices can detect radiation directly without conversion to visible light.…”

Section: Introductionmentioning

confidence: 99%

“…The second generation of cadmium telluride (CdTe) thin-film solar cells, combined with metal plates (e.g., copper), have sufficiently high atomic number and electron density to improve quantum efficiency. [17][18][19][20] Therefore, CdTe photovoltaic devices can detect radiation directly without conversion to visible light. CdTe detectors were found to be suitable for 6 MV X-ray measurements, as the percentage depth doses (PDDs) measured using CdTe detectors were in good agreement with the PDDs measured by ionization chambers.…”

Section: Introductionmentioning

confidence: 99%

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Development of a dosimetry system for therapeutic X‐rays using a flexible amorphous silicon thin‐film solar cell with a scintillator screen

et al. 2022

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Purpose To evaluate the dosimetric characteristics and applications of a dosimetry system composed of a flexible amorphous silicon thin‐film solar cell and scintillator screen (STFSC‐SS) for therapeutic X‐rays. Methods The real‐time dosimetry system was composed of a flexible a‐Si thin‐film solar cell (0.2‐mm thick), a scintillator screen to increase its efficiency, and an electrometer to measure the generated charge. The dosimetric characteristics of the developed system were evaluated including its energy dependence, dose linearity, and angular dependence. Calibration factors for the signal measured by the system and absorbed dose‐to‐water were obtained by setting reference conditions. The application and correction accuracy of the developed system were evaluated by comparing the absorbed dose‐to‐water measured using a patient treatment beam with that measured using the ion chamber. Results The responses of STFSC‐SS to energy, field size, depth, and source‐to‐surface distance (SSD) were more dependent on measurement conditions than were the responses of the ion chamber, although the former dependence was due to the scintillator screen, not the solar cell. The signals of STFSC‐SS were also dependent on dose rate, while the responses of solar cell alone and scintillator screen were not dependent on dose rate. The scintillator screen reduced the output of solar cell at 6 and 15 MV by 0.60 and 0.55%, respectively. The different absorbed dose‐to‐water measured using STFSC‐SS for patient treatment beam differed by 0.4% compared to those measured using the ionization chamber. The uncertainties of the developed system for 6 and 15 MV photon beams were 1.8 and 1.7%, respectively, confirming the accuracy and applicability of this system. Conclusions The thin‐film solar cell‐based detector developed in this study can accurately measure absorbed dose‐to‐water. The increased signal resulting from the use of the scintillator screen is advantageous for measuring low doses and stable signal output. In addition, this system is flexible, making it applicable to curved surfaces, such as a patient's body, and is cost‐effective.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of a dosimetry system for therapeutic X‐rays using a flexible amorphous silicon thin‐film solar cell with a scintillator screen

et al. 2022

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“…To characterize radiation transport through high‐Z/low‐Z boundaries, high spatial resolution must be applied both in computations (simulations) and experiment. In the clinical context (from clinical application perspective), high (nm–μm) spatial resolution computations and detection are required to study for instance microion chambers with high‐Z electrodes, micro beam radiotherapy (MRT), high‐Z nanoparticle radiotherapy (NPRT), and high‐energy current (HEC) detection, among others.…”

Section: Introductionmentioning

confidence: 99%

“…The EBT2 film dosimetry was an indirect method, in which high‐resolution Monte Carlo computations were combined with the experimental results using 30 μm Gafchromic films, yielding 250 nm virtual (semi empirical semi computational) spatial resolution. Another recent method for measuring the dose enhancement was using a CdTe detector placed in the vicinity of the high‐Z material …”

Section: Introductionmentioning

confidence: 99%

Signal enhancement due to high‐Z nanofilm electrodes in parallel plate ionization chambers with variable microgaps

2017

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We developed an experimental method to determine the signal enhancement due to high-Z nanolayers in parallel plate ionization chambers with micrometer spatial resolution. As the water-equivalent thicknesses of these air gaps are 3 nm to 10 μm, the method may also be applicable for nanoscopic spatial resolution of other gap materials. The method may be extended to solid insulator materials with low Z.

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Development of a real‐time in vivo dosimetry tool for electron beam therapy using a flexible thin film solar cell coated with scintillator powder

Jeong

Kwon

et al. 2022

Medical Physics

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Purpose A real‐time solar cell based in vivo dosimetry system (SC‐IVD) was developed using a flexible thin film solar cell and scintillating powder. The present study evaluated the clinical feasibility of the SC‐IVD in electron beam therapy. Methods A thin film solar cell was coated with 100 mg of scintillating powder using an optical adhesive to enhance the sensitivity of the SC‐IVD. Calibration factors were obtained by dividing the dose, measured at a reference depth for 6–20 MeV electron beam energy, by the signal obtained using the SC‐IVD. Dosimetric characteristics of SC‐IVDs containing variable quantities of scintillating powder (0–500 mg) were evaluated, including energy, dose rate, and beam angle dependencies, as well as dose linearity. To determine the extent to which the SC‐IVD affected the dose to the medium, doses at R90 were compared depending on whether the SC‐IVD was on the surface. Finally, the accuracy of surface doses measured using the SC‐IVD was evaluated by comparison with surface doses measured using a Markus chamber. Results Charge measured using the SC‐IVD increased linearly with dose and was within 1% of the average signal according to the dose rate. The signal generated by the SC‐IVD increased as the beam angle increased. The presence of the SC‐IVD on the surface of a phantom resulted in a 0.5%–2.2% reduction in dose at R90 for 6–20 MeV electron beams compared with the bare phantom. Surface doses measured using the SC‐IVD system and Markus chamber differed by less than 5%. Conclusions The dosimetric characteristics of the SC‐IVD were evaluated in this study. The results showed that it accurately measured the surface dose without a significant difference of dose in the medium when compared with the Markus chamber. The flexibility of the SC‐IVD allows it to be attached to a patient's skin, enabling real‐time and cost‐effective measurement.

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Thin‐film CdTe detector for microdosimetric study of radiation dose enhancement at gold‐tissue interface

Cited by 4 publications

References 22 publications

Development of a dosimetry system for therapeutic X‐rays using a flexible amorphous silicon thin‐film solar cell with a scintillator screen

Development of a dosimetry system for therapeutic X‐rays using a flexible amorphous silicon thin‐film solar cell with a scintillator screen

Signal enhancement due to high‐Z nanofilm electrodes in parallel plate ionization chambers with variable microgaps

Development of a real‐time in vivo dosimetry tool for electron beam therapy using a flexible thin film solar cell coated with scintillator powder

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