Ultra-High Precision Radiation Dosimetry via Laser Bleaching the Color Centers in Fast Recovery Optical Fiber Sensors

Ghahrizjani, Reza Taheri
Ameri, Mohsen
Jahanbakhsh, Hossein
Sadeghi, Hossein
Mohajerani, Ezeddin
High energy electromagnetic radiation or heavy charged particles are extensively used for medical treatment of certain cancers. Precise prediction or measurements of energy deposition of any types of radiation on tissue is critical in radiation therapy. In this research, the sensitivity of optical fiber dosimeters specifically doped with phosphor (P), Germanium (Ge) and Erbium (Er) are analyzed using Co-60 source at 169 cGy/min. The sensors are calibrated and the values of radiation induced attenuation (RIA) are evaluated at different temperatures. Nondestructive method of laser bleaching is shown superior to thermal bleaching for sensor recovery. The error in P- doped and Er- doped fiber sensors are estimated to be 6 and 4%, respectively. The fastest recovery is assigned to Er- doped fiber. The results show that Er- doped optical fiber sensor can perform ultrahigh sensitive low dosimetry of gamma- ray for medical application. The results of the present work can provide implications for further enhancement of radiation sensing for real- time dosimetry.


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Recently, there has been much interest in the capability of low cost glow discharge detectors (GDDs) for detection of terahertz radiation. To utilize them in applications such as terahertz imaging these studies have typically focused on the response of the GDD at specific frequencies. To better understand the spectral behavior of glow discharges, we examine the interaction mechanism of GDDs with terahertz radiation using terahertz time domain spectroscopy in a broader range of frequencies between 0.05 and 0...
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This paper demonstrates the feasibility of a portable radiation sensor system that uses the pulsed optically stimulated luminescence technique to remotely interrogate an aluminum oxide (Al2O3:C) radiation sensor via an optical fiber. The objective is to develop a system for applications requiring simple and inexpensive sensors for widespread monitoring of ionizing radiation levels, which can be remotely interrogated at regular periods with little or no human intervention and are easy to install, operate, an...
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Reflection and transmission properties of a new type of frequency selective surface (FSS) made of zigzag metallic elements placed periodically on a dielectric substrate are investigated theoretically for arbitrary polarisation. The electric field integral equation technique with the subdomain overlapping piecewise sinusoidal basis functions are employed to compute the unknown current coefficients induced on the metallic elements. The zigzag FSS arrays act as a low-pass filter in S-(1-5 GHz), X-(8-12 GHz) an...
Ionizing Radiation Induces Structural and Functional Damage on the Molecules of Rat Brain Homogenate Membranes: A Fourier Transform Infrared (FT-IR) Spectroscopic Study
Demir, Pinar; Akkaş, Sara Banu; Severcan, Mete; Zorlu, Faruk; Severcan, Feride (SAGE Publications, 2015-01-01)
Humans can be exposed to ionizing radiation, due to various reasons, whose structural effects on biological membranes are not well defined. The current study aims to understand the ionizing radiation-induced structural and functional alterations in biomolecules of brain membranes using Fourier transform infrared (FT-IR) spectroscopy using rat animal models. For this purpose, 1000 cGy of ionizing radiation was specifically directed to the head of Sprague Dawley rats. The rats were decapitated after 24 h. The...
Citation Formats
R. T. Ghahrizjani, M. Ameri, H. Jahanbakhsh, H. Sadeghi, and E. Mohajerani, “Ultra-High Precision Radiation Dosimetry via Laser Bleaching the Color Centers in Fast Recovery Optical Fiber Sensors,” IEEE SENSORS JOURNAL, pp. 5935–5942, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68183.