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Comparison of Current–Voltage Response to Diagnostic X-rays of Five Light-Emitting Diode Strips
Open AccessArticle

Amplification of Radiation-Induced Signal of LED Strip by Increasing Number of LED Chips and Using Amplifier Board

1
Medical Radiation Programme, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Malaysia
2
Engineering Physics Laboratory, School of Physics, Universiti Sains Malaysia, Penang 11800, Malaysia
3
Department of Radiology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Malaysia
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(2), 651; https://doi.org/10.3390/app10020651
Received: 6 December 2019 / Revised: 8 January 2020 / Accepted: 11 January 2020 / Published: 16 January 2020
(This article belongs to the Special Issue GaN-Based Light-Emitting Diodes)
Transducers, such as photodiodes, phototransistors, and photovoltaic cells are promising radiation detectors. However, for accurate radiation detection and dosimetry, signals that emanate from these devices have to be sufficient to facilitate accurate calibrations, i.e., assigning a quantity of radiation dose to a specific magnitude of the signal. More so, purposely fabricated for luminescence, LEDs produce significantly low signals during radiation detection applications. Therefore, this paper investigates the enhancement and augmentation of photovoltaic signals that were generated when LED strips were being exposed to diagnostic X-rays. Initially, signal amplification was achieved through increasing the effective LED active area (from 60 to 120 chips); by successively connecting LED strips. Further, signal amplification was undertaken by injecting the raw LED strip signal into an amplifier board with adjustable gains. In both the signal amplification techniques, the tube voltage (kVp), tube current-time product (mAs), and source-to-detector distance (SDD) were varied. The principal findings show that effective active area-based signal amplifications produced an overall average of 91.16% signal enhancement throughout all of the X-ray parameter variations. On the other hand, the amplifier board produced an average of 36.48% signal enhancement for the signals that were injected into it. Chip number increment-based signal amplifications had a 0.687% less coefficient of variation than amplifier board signal amplifications. The amplifier board signal amplifications were impaired by factors, such as dark currents, amplifier board maximum operational output voltage, and saturation. Therefore, future electronic signal amplification could use amplifier boards having low dark currents and high operational voltage headroom. The low-cost and simplicity that are associated with active-area amplification could be further exploited in a hybrid amplification technique with electronic amplification and scintillators. View Full-Text
Keywords: amplifier board; LED active area; diagnostic X-rays; tube voltage (kVp); source-to-detector distance (SDD); tube current-time product (mAs); application of LEDs amplifier board; LED active area; diagnostic X-rays; tube voltage (kVp); source-to-detector distance (SDD); tube current-time product (mAs); application of LEDs
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MDPI and ACS Style

Damulira, E.; Yusoff, M.N.S.; Omar, A.F.; Taib, N.H.M. Amplification of Radiation-Induced Signal of LED Strip by Increasing Number of LED Chips and Using Amplifier Board. Appl. Sci. 2020, 10, 651.

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