A fast and portable imager for neutron and gamma emitting radionuclides

Hamrashdi, H. Al; Cheneler, David; Monk, Stephen

doi:10.1016/j.nima.2019.163253

Cited by 14 publications

(11 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The capsule type 252 Cf source which has a 3.145 MBq activity was used as a fast neutron and multi energy gamma-ray source. Because 252 Cf emits an average of 3.759 neutrons and 8.3 gamma-rays per spontaneous fission event with a branching ratio of 3.09% 27 , the source emitted 3.5 × 10 5 n/s into 4π and 7.8 × 10 5 γ/s. The PSD value is given by the equation: where tail start and tail end are the beginning and end of the tail signal, respectively, used for the integration of charge generated by delayed light, as shown in Fig.…”

Section: Methods Sectionmentioning

confidence: 99%

Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array

Boo

Hammig

Jeong

2021

Sci Rep

View full text Add to dashboard Cite

Dual particle imaging, in which both neutrons and gamma-rays in the environment can be individually characterized, is particularly attractive for monitoring mixed radiation emitters such as special nuclear materials (SNM). Effective SNM localization and detection benefits from high instrument sensitivity so that real-time imaging or imaging with a limited number of acquired events is enabled. For portable applications, one also desires a dual particle imager (DPI) that is readily deployable. We have developed a hand-held type DPI equipped with a pixelated stilbene-silicon photomultiplier (SiPM) array module and low sampling-rate analog-to-digital converters (ADCs) processed via a multiplexed readout. The stilbene-SiPM array (12 × 12 pixels) is capable of effectively performing pulse shape discrimination (PSD) between gamma-ray and neutron events and neutron/gamma-ray source localization on the imaging plane, as demonstrated with 252Cf neutron/gamma and 137Cs gamma-ray sources. The low sampling rate ADCs connected to the stilbene-SiPM array module result in a compact instrument with high sensitivity that provides a gamma-ray image of a 137Cs source, producing 6.4 μR/h at 1 m, in less than 69 s. A neutron image for a 3.5 × 105 n/s 252Cf source can also be obtained in less than 6 min at 1 m from the center of the system. The instrument images successfully with field of view of 50° and provides angular resolution of 6.8°.

show abstract

Section: Methods Sectionmentioning

confidence: 99%

Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array

Boo

Hammig

Jeong

2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The intrinsic neutron efficiency of the device is of the order of 2 × 10 -3 for energies from thermal to 1 eV. Smaller efficiencies, ranging from 10 -3 and 10 -4 per incident neutron, have been reported for devices with comparable dimensions to GN-Vision [10,11]. The relatively large neutron imaging efficiency of the proposed device, which is directly related to the increasing neutron absorption cross section with decreasing neutron velocity and the intrinsically large thermal cross section of the 6 Li(n,α) reaction (940 barn), indicates the clear advantage of using slow neutrons for real-time imaging.…”

Section: Results Of the Gn-vision Performance 41 Neutron Imagingmentioning

confidence: 99%

“…The latter represents a clear disadvantage in terms of portability and applicability. In this re-spect, several groups have been recently working on the development of compact devices with dual neutron and γ -ray imaging capability [10,11].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Gamma-Neutron Vision device: a portable and versatile tool for nuclear inspections

Lerendegui-Marco,

Babiano-Suárez,

Balibrea-Correa

et al. 2024

EPJ Techn Instrum

View full text Add to dashboard Cite

This work presents GN-Vision, a novel dual γ-ray and neutron imaging system, which aims at simultaneously obtaining information about the spatial origin of γ-ray and neutron sources. The proposed device is based on two position sensitive detection planes and exploits the Compton imaging technique for the imaging of γ-rays. In addition, spatial distributions of slow- and thermal-neutron sources (<100 eV) are reconstructed by using a passive neutron pin-hole collimator attached to the first detection plane. The proposed gamma-neutron imaging device could be of prime interest for nuclear safety and security applications. The two main advantages of this imaging system are its high efficiency and portability, making it well suited for nuclear applications were compactness and real-time imaging is important. This work presents the working principle and conceptual design of the GN-Vision system and explores, on the basis of Monte Carlo simulations, its simultaneous γ-ray and neutron detection and imaging capabilities for a realistic scenario where a 252Cf source is hidden in a neutron moderating container.

show abstract

“…Al Hamrashdi et al [ 221 ] recently developed a portable dual-particle imager for the combined detection and localization of gamma-rays, thermal, and fast neutron sources for applications, such as nuclear materials assay and nuclear non-proliferation. The design and materials optimization were reported in References [ 222 , 223 ], which led to a three-layer configuration composed by the scintillating materials: GS10 lithium glass, EJ-204 plastic scintillator, and CsI(Tl) inorganic scintillator.…”

Section: Mobile Radiation Detection Systemsmentioning

confidence: 99%

State-of-the-Art Mobile Radiation Detection Systems for Different Scenarios

Marques

Vale

Vaz

2021

Sensors

View full text Add to dashboard Cite

In the last decade, the development of more compact and lightweight radiation detection systems led to their application in handheld and small unmanned systems, particularly air-based platforms. Examples of improvements are: the use of silicon photomultiplier-based scintillators, new scintillating crystals, compact dual-mode detectors (gamma/neutron), data fusion, mobile sensor networks, cooperative detection and search. Gamma cameras and dual-particle cameras are increasingly being used for source location. This study reviews and discusses the research advancements in the field of gamma-ray and neutron measurements using mobile radiation detection systems since the Fukushima nuclear accident. Four scenarios are considered: radiological and nuclear accidents and emergencies; illicit traffic of special nuclear materials and radioactive materials; nuclear, accelerator, targets, and irradiation facilities; and naturally occurring radioactive materials monitoring-related activities. The work presented in this paper aims to: compile and review information on the radiation detection systems, contextual sensors and platforms used for each scenario; assess their advantages and limitations, looking prospectively to new research and challenges in the field; and support the decision making of national radioprotection agencies and response teams in respect to adequate detection system for each scenario. For that, an extensive literature review was conducted.

show abstract

A fast and portable imager for neutron and gamma emitting radionuclides

Cited by 14 publications

References 37 publications

Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array

Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array

Simultaneous Gamma-Neutron Vision device: a portable and versatile tool for nuclear inspections

State-of-the-Art Mobile Radiation Detection Systems for Different Scenarios

Contact Info

Product

Resources

About