Energy Characteristics and Examination of the Dose Correction of Each Element Type in Small Size Radiophotoluminescence Glass Dosimetry Element System

Harui, Shogo; Matsumoto, Mitsuhiro; Ogata, Yuji

doi:10.6009/jjrt.66.509

Nippon Hoshasen Gijutsu Gakkai Zasshi

2010

DOI: 10.6009/jjrt.66.509

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Energy Characteristics and Examination of the Dose Correction of Each Element Type in Small Size Radiophotoluminescence Glass Dosimetry Element System

Shogo Harui

Mitsuhiro Matsumoto

Yuji Ogata

Abstract: We studied energy characteristics and examined dose correction when using a radiophotoluminescence glass dosimeter (GD). There are two types of GD. One type of GD is called GD-352, which consists of a glass element and Sn filter. Another type of GD is called GD-302, which has no additional filter. Energy characteristics of these two types of GDs were investigated using a diagnostic X-ray energy range. The equation is as follows: Cf (correction factor) = average of GD measured value/air kerma. The compensation … Show more

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Cited by 4 publications

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“…Compared with thermoluminescent dosimeters, RPLDs have less sensitivity dispersion, less fading, and higher stability against temperature and humidity. However, dose linearity, energy characteristics, and directional dependence are similar between thermoluminescent dosimeters and RPLDs [19,20] .…”

mentioning

confidence: 99%

Radiation Exposure of Interventional Radiologists during Computed Tomography Fluoroscopy-Guided Percutaneous Cryoablation

Seki

Miyazaki

Fukushima

et al. 2020

Interventional Radiology

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The principal aim of this study was to evaluate radiation exposure of interventionalists during computed tomography (CT) fluoroscopy-guided percutaneous cryoablation (PCA) using radiophotoluminescent glass dosimeters (RPLDs). The radioprotective effects of safety glasses and lead apron were also evaluated.Materials and Methods: Radiation exposure of interventionalists during 46 CT fluoroscopy-guided PCA procedures was evaluated. Entrance surface dose (ESD) was measured using RPLDs on multiple sites: five sites, representing eye lens exposure; five sites, representing body exposure; and four sites, representing skin exposure. The ESD values on multiple sites were compared between different PCA procedures (renal, liver, and bone).Results: The mean ESD on the X-ray-side hand exhibited the highest value (358.8 μGy). Regarding evaluation sites representing exposure to the eye lens, the highest ESD inside the radiation protective glasses was detected on the X-ray-side cheek (167.1 μGy). Most ESD values among multiple sites (10/14) were linearly correlated with CT fluoroscopy time. Among them, the ESD values measured during renal and liver PCA were relatively higher than those measured during bone PCA, especially on the chest area outside the lead apron, and on the X-ray tube-side elbow and hand during renal and bone PCA. Radioprotective effects of safety glasses and lead apron ranged from 44.6 to 50.6% and from 30.2 to 79.6%, respectively, on each evaluation site. Conclusion:The site with the highest radiation exposure on interventionalists during CT fluoroscopyguided PCA was the X-ray tube-side hand. Radiation exposure of interventionalists was at acceptable levels and consistent with the recommended dose limits.

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mentioning

confidence: 99%

Radiation Exposure of Interventional Radiologists during Computed Tomography Fluoroscopy-Guided Percutaneous Cryoablation

Seki

Miyazaki

Fukushima

et al. 2020

Interventional Radiology

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Radiation Exposure to the Brains of Interventional Radiology Staff: A Phantom Study

Ohno,

Shindo,

Konta

et al. 2024

Bioengineering

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Numerous papers report the occurrence of head and neck tumors in interventional radiology (IR) physicians. Recently, appropriate dosimetry and protection have become much more important. To accomplish these, first, we should accurately understand how the brain is exposed. We assessed the dose distribution of the head and clarified the relationship between head exposure and brain dose. We used eight radiophotoluminescence dosimeters (RPLDs), two at the surface of the eyes and six inside the phantom head. We conducted measurements with three kinds of irradiation fields: one irradiated the whole head, the second irradiated the brain region, and the third irradiated the soft tissue of the face. The cranial bone reduced the brain dose to less than half the skin dose: about 48% at the front and less than 9% at the back of the brain. Due to the brain exposure, the soft tissues were slightly exposed to the scatter radiation from the cranial bone. We revealed the dose distribution of the head and the influence of the scatter radiation from the cranial bone and the soft tissues of the face. There are two kinds of scatter radiation: from the cranial bone to the soft tissue of the face, and from the soft tissue to the brain. Although the influence of these sources of scatter radiation is not significant, the relationship between brain exposure and the occurrence of head and neck tumors is still unclear. Therefore, some IR physicians should keep this in mind if they receive high levels of exposure in their daily practice.

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The Method for Estimation of Radiation Dose of Eye Lens Covered by Radiation Protection Glasses Using Personal Dosimeter for Trunk of the Body and X-ray Shielding Material

Osanai

Sato

Sato³

et al. 2021

Nippon Hoshasen Gijutsu Gakkai Zasshi

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Radiation protection glasses is a useful tool for dose reduction of eye lens. However, the method to evaluate the dose of eye lens, which is covered with radiation protection glasses in actual radiation management situation, has not been established. We invented the easy-to-use procedure to estimate the dose of eye lens inside of radiation protection glasses for occupationally exposed person using an X-ray shielding material and an additional personal dosimeter for trunk of the body. The objective of this study was to evaluate the feasibility of the new method. Methods: The radiation field in interventional radiology (IR) was reconstructed. A personal dosimeter was set to the eye position and neck position of medical staff phantom. Each dosimeter was covered by radiation protection glasses or X-ray shielding material, and the 1 cm or 70 mm dose equivalent quantity in the neck position was compared to the 3 mm dose equivalent quantity in the eye position. Results: The dose equivalent quantity measured inside of X-ray shielding material in the neck position was similar to that of inside radiation protection glasses. Thus, the X-ray attenuation by radiation protection glasses was able to be simulated using the X-ray shielding material. Conclusion: It was suggested that the dose of eye lens inside of radiation protection glasses could be easily estimated by covering the conventional personal dosimeter for trunk of the body with the X-ray shielding material.

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Energy Characteristics and Examination of the Dose Correction of Each Element Type in Small Size Radiophotoluminescence Glass Dosimetry Element System

Cited by 4 publications

References 5 publications

Radiation Exposure of Interventional Radiologists during Computed Tomography Fluoroscopy-Guided Percutaneous Cryoablation

Radiation Exposure of Interventional Radiologists during Computed Tomography Fluoroscopy-Guided Percutaneous Cryoablation

Radiation Exposure to the Brains of Interventional Radiology Staff: A Phantom Study

The Method for Estimation of Radiation Dose of Eye Lens Covered by Radiation Protection Glasses Using Personal Dosimeter for Trunk of the Body and X-ray Shielding Material

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