Experience of Application of New Remote Controlled Instruments for Scanning of Distribution of Radioactive Contamination in Rooms With High Dose Rate

2011 ◽  
Author(s):  
V. E. Stepanov ◽  
A. S. Danilovich ◽  
O. P. Ivanov ◽  
V. N. Potapov ◽  
S. V. Smirnov ◽  
...  
Keyword(s):  
Remote Control ◽  
Radioactive Contamination ◽  
Gamma Camera ◽  
Background Radiation ◽  
High Dose Rate ◽  
High Dose ◽  
Kurchatov Institute ◽  
Nuclear Facilities ◽  
High Level ◽  
Spectrometric System

When carrying out the decommissioning of nuclear facilities is necessary to measure the distribution of radioactive contamination in the rooms and the equipment at high levels of background radiation. In the decommissioning of the reactor in the MR NRC “Kurchatov Institute” for such problems is developed and applied a few special systems with remote control. For a survey of high-level objects used mounted on the robot radiometric system. To determine the composition of pollutants and use a portable collimated spectrometric system. To obtain a detailed distribution of contamination of used remote-controlled gamma camera.

Development of a simultaneous imaging system to measure the optical and gamma ray images of Ir-192 source for high-dose-rate brachytherapy

2021 ◽  
Vol 16 (12) ◽  
pp. T12005
Author(s):  
J. Nagata ◽  
S. Yamamoto ◽  
Y. Noguchi ◽  
T. Nakaya ◽  
K. Okudaira ◽  
...  
Keyword(s):  
Dose Rate ◽  
Spatial Resolution ◽  
Gamma Camera ◽  
Gamma Ray ◽  
Imaging System ◽  
High Dose Rate ◽  
High Dose ◽  
Cmos Camera ◽  
Absolute Position ◽  
The Absolute

Abstract In high-dose-rate (HDR) brachytherapy, verification of the Ir-192 source's position during treatment is needed because such a source is extremely radioactive. One of the methods used to measure the source position is based on imaging the gamma rays from the source, but the absolute position in a patient cannot be confirmed. To confirm the absolute position, it is necessary to acquire an optical image in addition to the gamma ray image at the same time as well as the same position. To simultaneously image the gamma ray and optical images, we developed an imaging system composed of a low-sensitivity, high-resolution gamma camera integrated with a CMOS camera. The gamma camera has a 1-mm-thick cerium-doped yttrium aluminum perovskite (YAIO3: YAP(Ce)) scintillator plate optically coupled to a position-sensitive photomultiplier (PSPMT), and a 0.1-mm-diameter pinhole collimator was mounted in front of the camera to improve spatial resolution and reduce sensitivity. We employed the concept of a periscope by placing two mirrors tilted at 45 degrees facing each other in front of the gamma camera to image the same field of view (FOV) for the gamma camera and the CMOS camera. The spatial resolution of the imaging system without the mirrors at 100 mm from the Ir-192 source was 3.2 mm FWHM, and the sensitivity was 0.283 cps/MBq. There was almost no performance degradation observed when the mirrors were positioned in front of the gamma camera. The developed system could measure the Ir-192 source positions in optical and gamma ray images. We conclude that the developed imaging system has the potential to measure the absolute position of an Ir-192 source in real-time clinical measurements.

SU-E-I-26: When Is High Level-Control Fluoroscopy Not High Dose-Rate Fluoroscopy?

2013 ◽  
Vol 40 (6Part5) ◽  
pp. 130-131
Author(s):  
D Bednarek ◽  
J PazLozada ◽  
S Rudin
Keyword(s):  
Dose Rate ◽  
High Dose Rate ◽  
High Dose ◽  
Level Control ◽  
High Level

Imaging of Ir-192 source using a high energy gamma camera for high-dose-rate brachytherapy

2019 ◽  
Vol 126 ◽  
pp. 106128 ◽  
Author(s):  
Seiichi Yamamoto ◽  
Katsunori Yogo ◽  
Yumiko Noguchi ◽  
Takayoshi Nakaya ◽  
Kuniyasu Okudaira
Keyword(s):  
Dose Rate ◽  
Gamma Camera ◽  
High Energy ◽  
High Dose Rate ◽  
High Dose ◽  
High Dose Rate Brachytherapy ◽  
High Energy Gamma ◽  
Energy Gamma

scholarly journals Comparative Evaluation of Three Wireless Sensor Network Transceivers in a High Radiation Environment

2020 ◽  
Vol 225 ◽  
pp. 08007
Author(s):  
Q. Huang ◽  
J. Jiang ◽  
Y. Q. Deng
Keyword(s):  
Nuclear Power ◽  
Nuclear Reactor ◽  
Experimental Studies ◽  
High Dose Rate ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Radiation Environment ◽  
High Dose ◽  
Rate Condition ◽  
High Level

This paper presents on the results of radiation studies for three commonly used wireless sensor nodes based on the following protocols: ZigBee, WirelessHART, ISA 100.11a, and network devices built with commercial off-the-shelf (COTS) components. The level of radiation considered is at par with that experienced at Fukushima Daiichi Nuclear Power Plant after the accident. An experimental setup is developed to monitor behaviors of each wireless device and network real-time under the 60Co gamma radiator at The Ohio State University Nuclear Reactor Lab (OSU-NRL). The experimental results have indicated that the performance of the communication channels and wireless signal parameters do not degrade significant under such radiation. However, all the tested devices and networks can only survive for several hours under the high dose rate condition (20 K Rad/h). The results of these experimental studies have provided useful references to those who design and manufacture COTS-based wireless monitoring systems for use in high level radiation environments.

Variation in applicator positions during interfraction high-dose rate brachytherapy in carcinoma cervix: dosimetric evaluation

2013 ◽  
Vol 12 (4) ◽  
pp. 305-317
Author(s):  
Kamlesh Passi ◽  
Lalit M. Aggarwal ◽  
Rajesh Vashistha ◽  
Bikramjit Singh ◽  
Parveen Kaur ◽  
...  
Keyword(s):  
Remote Control ◽  
Dose Rate ◽  
Control Unit ◽  
High Dose Rate ◽  
High Dose ◽  
Carcinoma Cervix ◽  
High Dose Rate Brachytherapy ◽  
Clinical Interpretation ◽  
Group I ◽  
Group Ii

AbstractPurposeThis study was designed to study the variations in different geometrical and dosimetric parameters.Materials and methodsIn this study, two groups comprises 21 and 28 patients, who were treated with 9·5 Gy × 2 Fx and 7·5 Gy × 3 Fx, respectively, using microselectron high-dose rate (HDR) remote control unit. All patients were analysed using orthogonal radiographs to evaluate variations in different parameters.ResultsVariations in different parameters are more in Group II patients than in Group I patients, which show that the variation in geometrical and dosimetrical parameters increases with increasing HDR number of fractions.ConclusionIn the reporting of an outcome of multiple fractionation of HDR treatments resultant dosimetric parameters must be evaluated and must be used for clinical interpretation.

scholarly journals Erratum: Development of a simultaneous imaging system to measure the optical and gamma ray images of Ir-192 source for high-dose-rate brachytherapy

2022 ◽  
Vol 17 (01) ◽  
pp. E01001
Author(s):  
J. Nagata ◽  
S. Yamamoto ◽  
Y. Noguchi ◽  
T. Nakaya ◽  
K. Okudaira ◽  
...  
Keyword(s):  
Dose Rate ◽  
Spatial Resolution ◽  
Gamma Camera ◽  
Gamma Ray ◽  
Imaging System ◽  
High Dose Rate ◽  
High Dose ◽  
Simultaneous Imaging ◽  
Yttrium Aluminum ◽  
Position Sensitive

Abstract The gamma camera has a 1-mm-thick cerium-doped yttrium aluminum perovskite (YA1O_3: YAP(Ce)) scintillator plate optically coupled to a position-sensitive photomultiplier (PSPMT), and a 0.1-mm-diameter pinhole collimator was mounted in front of the camera to improve spatial resolution and reduce sensitivity.

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