Advanced multi-dimensional imaging of gamma-ray radiation

Woodring, Mitchell L.; Beddingfield, D. H.; Souza, David; Entine, G.; Squillante, Michael R.; Christian, James F.; Kogan, Alex

doi:10.1016/s0168-9002(03)01111-2

Cited by 30 publications

(8 citation statements)

References 4 publications

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“…The gamma cameras can be classified into three types: a pinhole type [2][3][4] and a coded aperture type [5][6][7][8][9], each of which has a collimator, and a Compton type camera [10][11][12][13][14] which does not need the collimator. Each type has different characteristics due to the different imaging principles.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic gamma camera for use in high dose environments

Ueno

Takahashi

Ishitsu

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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We developed a pinhole gamma camera to measure distributions of radioactive material contaminants and to identify radionuclides in extraordinarily high dose regions (1,000 mSv/h). The developed gamma camera is characterized by: (1) tolerance for high dose rate environments; (2) high spatial and spectral resolution for identifying unknown contaminating sources; and (3) good usability for being carried on a robot and remotely controlled. These are achieved by using a compact pixelated detector module with CdTe semiconductors, efficient shielding, and a fine resolution pinhole collimator. The gamma camera weighs less than 100 kg, and its field of view is an 8 m square in the case of a distance of 10 m and its image is divided into 256 (16 x 16) pixels. From the laboratory test, we found the energy resolution at the 662 keV photopeak was 2.3% FWHM, which is enough to identify the radionuclides. We found that the count rate per background dose rate was 220 cps h/mSv and the maximum count rate was 300 kcps, so the maximum dose rate of the environment where the gamma camera can be operated was calculated as 1,400 mSv/h. We investigated the reactor building of Unit 1 at the Fukushima Dai-ichi Nuclear Power Plant using the gamma camera and could identify the unknown contaminating source in the dose rate environment that was as high as 659 mSv/h.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic gamma camera for use in high dose environments

Ueno

Takahashi

Ishitsu

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…In a high-contamination area, workers who are engaged in decontamination or radiation measurement must be protected from excessive radiation exposure. Gamma cameras and Compton cameras have been utilized for the detection of radiation hotspots (Kataoka et al, 2013;Woodring et al, 2003). These types of instruments have high sensitivity to gamma rays.…”

Section: Introductionmentioning

confidence: 99%

A radioactive contamination monitoring system with a bead-type radiophotoluminescence glass dosimeter

Zushi

Sato

Kato

et al. 2016

Radiation Measurements

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A radiophotoluminescence (RPL) monitoring scope system was constructed to evaluate radioactive cesium contamination. RPL glass sheets were constructed by bonding RPL glass beads to a backing sheet. The RPL scope was constructed using an image intensifier and a CCD camera to detect RPL from the RPL glass sheet. A UV floodlight was also prepared as an excitation light source. The UV floodlight and an image intensifier were pulse-operated for high signal-to-noise RPL detection. In experiments, the RPL of X-ray irradiated glass sheets was measured with this present system. The RPL intensity, which is calculated from the brightness of obtained images, exhibits acceptable linearity to the absorbed dose. Another experiment showed that RPL can be detected at a distance of 10 m between the RPL glass sheets and the RPL detector.

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“…This imaging method has been proposed and used in a number of applications, most notably high energy astronomy [4] and nuclear medicine [5], although its use has also been suggested for tracking radiation contamination [6] and flaw detection in mechanical structures [7].…”

Section: Introductionmentioning

confidence: 99%

“…Examples include near real-time imaging in nuclear medicine where fast diagnosis is required (similar studies in real time medical ultrasound imaging have been done by Heimdal et al [20] and Choe [21]). Also speed may be required in the rapid location of radioactive sources, for example during a spillage of potentially dangerous material in order that the hazard may be dealt with urgently [6]. In addition to the aforementioned cases, there are a number of non-coded aperture applications and systems that use similar correlation techniques, and which may therefore also benefit from faster decoding.…”

Section: Introductionmentioning

confidence: 99%

Fast decoding algorithms for coded aperture systems

Byard

2014

Nuclear Instruments and Methods in Physics Research Section A:

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. a b s t r a c t Fast decoding algorithms are described for a number of established coded aperture systems. The fast decoding algorithms for all these systems offer significant reductions in the number of calculations required when reconstructing images formed by a coded aperture system and hence require less computation time to produce the images. The algorithms may therefore be of use in applications that require fast image reconstruction, such as near real-time nuclear medicine and location of hazardous radioactive spillage. Experimental tests confirm the efficacy of the fast decoding techniques.

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Advanced multi-dimensional imaging of gamma-ray radiation

Cited by 30 publications

References 4 publications

Spectroscopic gamma camera for use in high dose environments

Spectroscopic gamma camera for use in high dose environments

A radioactive contamination monitoring system with a bead-type radiophotoluminescence glass dosimeter

Fast decoding algorithms for coded aperture systems

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