Neutron Detectors

Beckurts, K. H.; Wirtz, K.

doi:10.1007/978-3-642-87614-1_3

Cited by 3 publications

References 42 publications

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A Gadolinium Metal‐Organic Framework Film as a Converter Layer for Neutron Detection

et al. 2020

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Metal‐organic frameworks (MOFs) are known for their versatility in terms of their crystalline structure, porosity, resistance to temperature, radiation damage, and luminescence among others. Gadolinium (Gd) is one of the elements with the highest reported cross‐section for low energy neutron capture, producing internal conversion electrons and γ rays as a result of the neutron absorption. The development of Gd‐BTC films (BTC=1,3,5‐benzenetricarboxylate) is shown that were deposited on Si and Al substrates by airbrushing, and characterized by profilometry, Raman, EDX and X‐ray diffraction. Radiation damage, thermal decomposition and neutron absorption of these films were studied as well. Gd‐BTC films were attached to CMOS devices (Complementary Metal‐Oxide‐Semiconductor), which are sensible to the internal conversion electrons, in order to build a neutron detector. The devices Gd‐BTC/CMOS could selectively detect neutrons in the presence of γ rays with a thermal neutron detection efficiency of 3.3±0.1 %, a signal to noise ratio of 6 : 1, and were suitable to obtain images.

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A Gadolinium Metal‐Organic Framework Film as a Converter Layer for Neutron Detection

et al. 2020

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Development of a compact flat response neutron detector

Harano

Matsumoto

Nishiyama

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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Long counters are widely used as neutron fluence monitors by utilizing their flat-response feature. A bulky neutron moderator is required however to achieve the flatresponse feature, which can be a disadvantage from the viewpoint of portability as well as an undesirable source of scattered neutrons. Just downsizing the moderator deteriorates the flat response especially for high-energy neutrons. We proposed a new method to downsize the moderator with keeping the flat-response feature and developed a compact flat-response neutron detector in the present study. The detector consists of two small spherical 3 He proportional counters embedded in appropriate positions in a compact cylindrical polyethylene moderator. The sensitivity ratio between the two counters was adjusted to provide a flat response in the total outputs from the two counters. It was demonstrated by MCNPX calculations and response measurements for Cf and Am-Be neutrons and monoenergetic neutrons that the present detector had a good flat response in the wide energy range up to 20 MeV while being downsized by one fifth compared with long counters. The positions of the effective center were determined as a function of the neutron energy. We also proposed a method to evaluate the neutron energy using the detector, which will allow various new applications by taking advantage of measuring the neutron fluence and energy at the same time.

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Development of a Compact Flat Response Neutron Detector

Harano

Matsumoto

Nishiyama

et al. 2011

IEEE Trans. Nucl. Sci.

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Long counters are widely used as neutron fluence monitors for their flat response. However, a bulky neutron moderator is required to achieve the flat response, which can be a disadvantage for portability and an undesirable source of scattered neutrons. Reducing the size of the moderator degrades the flat response, especially for high-energy neutrons. We propose a new method to reduce the size of the moderator while keeping a flat response, and we develop a compact flat-response neutron detector. The detector consists of two small spherical 3 He proportional counters embedded at appropriate positions in a compact cylindrical polyethylene moderator. The sensitivity ratio between the two counters was adjusted to provide a flat response in the total outputs from the two counters. We demonstrated by MCNPX calculations and response measurements for Cf and Am-Be neutrons and monoenergetic neutrons that the present detector had a sensitivity comparable to long counters with a good flat response in a wide energy range up to 20 MeV while being only one-fifth of the weight of long counters. The positions of the effective center were determined as a function of neutron energy. We also proposed a method to evaluate the neutron energy using the detector, which will allow various new applications taking advantage of the ability to measure neutron fluence and energy at the same time.Index Terms-Effective center, flat response, long counter, neutron energy evaluation, neutron fluence measurement.

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Neutron Detectors

Cited by 3 publications

References 42 publications

A Gadolinium Metal‐Organic Framework Film as a Converter Layer for Neutron Detection

A Gadolinium Metal‐Organic Framework Film as a Converter Layer for Neutron Detection

Development of a compact flat response neutron detector

Development of a Compact Flat Response Neutron Detector

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