An application of CCD read-out technique to neutron distribution measurement using the self-activation method with a CsI scintillator plate

Nohtomi, Akihiro; Kurihara, Ryosuke; Kinoshita, Hiroyuki; Honda, Shinya; Tokunaga, Masaaki; Uno, Heita; Shinsho, Kiyomitsu; Wakabayashi, Go; Koba, Yusuke; Fukunaga, Junichi; Umezu, Yoshiyuki; Nakamura, Yasuhiko; Ohga, Shouichi

doi:10.1016/j.nima.2016.06.078

Cited by 5 publications

(2 citation statements)

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“…Then, those images are analyzed by a software "Image-J" to obtain the time variation of mean pixel values in the specified region of interested. From the analysis of time behavior, each luminance component of different radioactivity ( 128 I, 134m Cs) can be separated properly by fitting it with each half-life [5]. This technique has an advantage over so-called "indirect neutron radiography" using the imaging plate owing to higher efficiency to detect neutron induced radiation.…”

Section: Methodsmentioning

confidence: 99%

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Neutron Distribution Measurement by the Self-Activation of a CsI Plate with CCD Camera Using a Decaying Self-Activation Imaging Technique

Nohtomi

Tokunaga

Wakabayashi

et al. 2019

Proceedings of the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)

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Neutron intensity distribution on a CsI scintillator plate has been observed by a CCD camera and analyzed by using a "decaying self-activation imaging technique". The decaying self-activation imaging, which has been proposed recently by our group, is based on the analysis of time variation of specific radio-activities generated and remained inside the CsI plate after the termination of neutron irradiation. The luminance distributions of a CsI plate are recorded every one minute as a series of images by a cooling type CCD camera with a telescope lens in a black box. Then the time variations of luminance (mean pixel values) of the images are fitted on a "pixel-by-pixel basis" with a multi-exponential function. By this, two components of 128 I (half life : 25 min) and 134m Cs (half life : 174 min) are extracted as the fitting curves. The initial luminance values of individual component of radioactivity, which correspond to the values at the termination of neutron irradiation, are plotted as separate images. A conversion factor between the generated activity in a CsI plate and the observed luminance value is evaluated as "light yield".

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Section: Methodsmentioning

confidence: 99%

“…On the other hand, if the optical signals are readout by a CCD camera, integrated intensity is observed as an image [5]. Though this is a relative measurement, neutron imaging may be possible through the evaluation of activity distributions.…”

Section: Introductionmentioning

confidence: 99%