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Dose rates, especially from photons and neutrons, inform safety procedures in any radioactive environment. A method for measuring dose rates from both particles with one device will simplify current methods for surveying dose fields. We have developed a technique using organic scintillators that is based on the definition of effective dose, extracted from energy deposited in the detector. Using pulse...
The detection of fast neutrons by recoiled protons from a plastic scintillator situated very close to the pixel detector Timepix was introduced. The directional sensitivity of the detection was proven when signal generated by the scintillating light collected by silicon photomultipliers (SiPM) was used for triggering and synchronization of the system. In the proposed contribution the technique refines...
The European Spallation Source (ESS) sets the scope on replacing 3He tube detectors where it is reasonably achievable, consequently advanced neutron detectors require a signal-to-noise (S/N) ratio high enough to be competitive with 3He tubes and satisfy scientific requirements. Advanced local shielding could provide the improved S/N. The objective of the current study is to create a tool that can...
Results are presented of the opto-electrical characterization of two analog and one digital SiPM arrays, produced by three different manufacturers (SensL, Hamamatsu, and Philips), before and after irradiation with cold neutrons (with a wavelength of 5 Å) at the KWS-1 instrument of the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching, Germany. Irradiation doses of up to 6×1012 n/cm2 were used. We assessed...
Neutron imaging is widely used in scientific experiments and industrial applications. The neutron sensitive microchannel plate (nMCP) detector plays the role of registering penetrating neutrons and realizing high spatial resolution. The delay-line readout anode can achieve a high spatial resolution with an acceptable throughput. To optimize working parameters of the nMCP detector with the delay-line...
A technique is presented to algorithmically evaluate prompt gamma neutron activation spectra, which were produced through excitation of specific material samples. The excitation is done with a neutron generator that provides a switchable, artificial form of neutron radiation. To evaluate the spectra, a extension to prior peak based analysis methods is proposed that dynamically incorporates the detector...
The medical LINACS with energies greater than 8 MeV produce photo-neutrons along with x-rays. These photo-neutrons contaminate the therapeutic beam and are of concern to the personnel working around the treatment room. Consequently, study of neutron albedo is very helpful for radiation protection purposes. In this work, the integral neutron albedo is determined as a function of thickness of target...
Live interaction, interdisciplinary multi-physics demonstrations using the tensioned metastable fluid detector (TMFD) sensor systems are proposed. TMFDs utilize centrifugal-acoustic forcing to place ordinary liquids like water into sub-zero (i.e., below vacuum) pressure states of metastability such that interacting subatomic scale particles, or even eV photons can be detected via visible-audible transient...
Paper provides considerations for utilization of DD generator tube at VR-1 reactor facility. It gives applicable approaches to modelling the DD reaction as a source of neutrons. Further, it provides modelling of neutron field parameters around such source in bare geometry, moderated geometry and in geometry, where the DD tube would be used in radial channel of zero power VR-1 reactor.
Neutron flux is an important parameter for Accelerated Driven Systems. Density of the neutron flux is different in various positions inside a spallation target. The neutron flux can be obtained with the use of threshold activation detectors. An experiment with the spallation target made of 512 kg natural uranium and deuteron beam with energy 8 GeV was performed at the Joint Institute for Nuclear Research...
The (n, p) reaction cross section for some structural materials such as 75As, 66Zn, 64Zn, 55Mn, 51V and 58Ni was measured at 14.2±0.2 MeV using activation and off line gamma ray spectroscopic technique. For the purpose of safe and economical design of reactors, the neutron cross section data for structural materials are required with high precession and accuracy. The neutron cross section data for...
Frequently, shields used for protection againstradiation contain some vacuum channels for passingcables and instruments for measurements. The neutrontransmission through these shields is an unavoidablephenomenon, so we have interested in this work to studyand discuss the effect of vacuum channels on neutrontransmission through shields [1]. We have considered aninfinite homogenous slab, with a fixed...
Experimental work on light charged ion production from thick target shielding began this past May at the NASA Space Radiation Laboratory (NSRL) at Brookhaven National Laboratory (BNL). This paper presents the measured secondary light charged ion and neutron yields produced by 0.4- and 2.5-GeV protons and 0.4- and 1.0-AGeV iron ions striking a 30 g/cm2 aluminum target. Neutron and light charged ion...
A novel silicon PIN diode with guard ring structure on top of the device for fast neutron dose measurement is presented. The device is designed to include p+ and n+ square contacts on each side of the high resistivity silicon, and a p+ ring surrounding the square p+ region on front side of the device. The sensitivity of the PIN diodes to Am-Be isotropic fast neutron radiation source, whose energy...
A proton recoil method along with Silicon Carbide semiconductor detector is presented in this paper. It consist of hydrogenous converter layer to generate recoil protons by means of neutron elastic scattering (n, p) reaction and radiation hard semiconductor material (Silicon Carbide) layer to generate detectable electrical signal upon transport of recoil protons through it. Converter layer thickness...
In the elemental analyzer based on neutron induced prompt gamma-ray analysis, the master program is compiled by C#. It can not only compute the elemental contents of Si, Al, Fe and Ca, but also can control the hardware of the analyzer, such as BGO gamma ray detector, Multi-channel pulse analyzer, neutron detector, and D-D neutron generator. The results indicate that the equipment failure rate caused...
Neutron radiography is one of effective nondestructive methods for investigation of defects in the specimen. It has a capability to detect a light element, especially hydrogen, while other radiography cannot. In this study, the technique of fast neutron radiography using the (n, p) reaction has been developed. The (n, p) reaction is the nuclear reaction that converts fast neutron particles into proton...
Tracking radioactive sources in 3D can impact homeland security, airport/port surveillance and the military. Unfortunately, the radiological sensors with the highest SNR and the lowest price are unidirectional - i.e. They integrate radiation from a sphere of directions centered at the sensor. We combine such devices with commercially available depth sensors to break this directional ambiguity. We...
Fast scintillation detectors based on Lanthanum Bromide (LaBr3) crystals are nowadays used in nuclear physics experiments, mainly to measure γ-ray energy and time information. The Milano group has developed a 10 large volume (3.5″×8″) LaBr3 detector array (HECTOR+) and collaborates to a a γ-calorimeter based on tens of LaBr3-NaI phoswich detectors (PARIS). A dedicated 16 channels NIM analog module...
Lithium indium diselenide (6LiInSe2) has drawn interest in recent years as a thermal neutron detector due to its high volumetric thermal neutron detection efficiency. Enriched in 6Li, the single crystalline semiconductor can reach thermal neutron detection efficiencies approaching 80% at thickness of 0.5 cm. With a Q-value of 4.78 MeV, the material also offers neutrongamma discrimination capabilities...
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