MDPI - Publisher of Open Access Journals

15 pages, 6344 KiB

Open AccessArticle

A Fiber-Optical Dosimetry Sensor for Gamma-Ray Irradiation Measurement in Biological Applications

by Adel Shaaban Awad Elsharkawi, Huda A. Alazab, Mahmoud Sayed, Mostafa A. Askar, Ibrahim Y. Abdelrahman, Amany A. Arafa, Hassan I. Saleh, Lotfy R. Gomaa and Yi-Chun Du

Biosensors 2023, 13(12), 1010; https://doi.org/10.3390/bios13121010 - 3 Dec 2023

Cited by 1 | Viewed by 2325

Abstract

In this paper, we propose a novel fiber-optical dosimetry sensor for radiation measurement in biological applications. A two-dimensional (2D) fiber-optical dosimeter (FOD) for radiation measurement is considered. The sensors are arranged as a 2D array in a tailored holder. This FOD targets accurate industrial and medical applications which seek more tolerant radiation dosimeters. In this paper, the FOD sensors are subjected to gamma-ray radiation facilities from the ¹³⁷Cs gamma-ray irradiator type for low doses and ⁶⁰Co gamma-ray irradiator for high doses. For better evaluation of radiation effects on the FOD sample, the measurements are performed using eight sensors (hollow cylinder shape) with two samples in each dose. The sensors were measured before and after each irradiation. To the author’s knowledge, the measurements of FOD transplanted inside animals are presented for the first time in this paper. A 2D simulation program has been implemented for numerical simulation based on the attenuation factors from the absorbed dose inside the in vivo models. A comparison between the FOD and the standard thermo-luminescence detector is presented based on the test of in vivo animal models. The results indicate that the proposed FOD sensor is more stable and has higher sensitivity. Full article

(This article belongs to the Section Optical and Photonic Biosensors)

► Show Figures

Graphical abstract

15 pages, 907 KiB

Open AccessArticle

Effects of Temperature and X-rays on Plastic Scintillating Fiber and Infrared Optical Fiber

by Bongsoo Lee, Sang Hun Shin, Kyoung Won Jang and Wook Jae Yoo

Sensors 2015, 15(5), 11012-11026; https://doi.org/10.3390/s150511012 - 11 May 2015

Cited by 7 | Viewed by 7480

Abstract

In this study, we have studied the effects of temperature and X-ray energy variations on the light output signals from two different fiber-optic sensors, a fiber-optic dosimeter (FOD) based on a BCF-12 as a plastic scintillating fiber (PSF) and a fiber-optic thermometer (FOT) using a silver halide optical fiber as an infrared optical fiber (IR fiber). During X-ray beam irradiation, the scintillating light and IR signals were measured simultaneously using a dosimeter probe of the FOD and a thermometer probe of the FOT. The probes were placed in a beaker with water on the center of a hotplate, under variation of the tube potential of a digital radiography system or the temperature of the water in the beaker. From the experimental results, in the case of the PSF, the scintillator light output at the given tube potential decreased as the temperature increased in the temperature range from 25 to 60 °C. We demonstrated that commonly used BCF-12 has a significant temperature dependence of −0.263 ± 0.028%/°C in the clinical temperature range. Next, in the case of the IR fiber, the intensity of the IR signal was almost uniform at each temperature regardless of the tube potential range from 50 to 150 kVp. Therefore, we also demonstrated that the X-ray beam with an energy range used in diagnostic radiology does not affect the IR signals transmitted via a silver halide optical fiber. Full article

(This article belongs to the Section Physical Sensors)

► Show Figures

Figure 1

12 pages, 1077 KiB

Open AccessArticle

Measurement of Entrance Surface Dose on an Anthropomorphic Thorax Phantom Using a Miniature Fiber-Optic Dosimeter

by Wook Jae Yoo, Sang Hun Shin, Dayeong Jeon, Seunghan Hong, Hyeok In Sim, Seon Geun Kim, Kyoung Won Jang, Seunghyun Cho, Won Sik Youn and Bongsoo Lee

Sensors 2014, 14(4), 6305-6316; https://doi.org/10.3390/s140406305 - 1 Apr 2014

Cited by 14 | Viewed by 8242

Abstract

A miniature fiber-optic dosimeter (FOD) system was fabricated using a plastic scintillating fiber, a plastic optical fiber, and a multi-pixel photon counter to measure real-time entrance surface dose (ESD) during radiation diagnosis. Under varying exposure parameters of a digital radiography (DR) system, we measured the scintillating light related to the ESD using the sensing probe of the FOD, which was placed at the center of the beam field on an anthropomorphic thorax phantom. Also, we obtained DR images using a flat panel detector of the DR system to evaluate the effects of the dosimeter on image artifacts during posteroanterior (PA) chest radiography. From the experimental results, the scintillation output signals of the FOD were similar to the ESDs including backscatter simultaneously obtained using a semiconductor dosimeter. We demonstrated that the proposed miniature FOD can be used to measure real-time ESDs with minimization of DR image artifacts in the X-ray energy range of diagnostic radiology. Full article

(This article belongs to the Special Issue Photonic Sensors for Industrial, Environmental and Health Monitoring)

► Show Figures

Search Results (3)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI

Saved Queries

Search Filter Reset All

Years

Feature Papers

Subjects

Journals

Article Types

Countries / Regions

Search Results (3)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI