Портативная радиометрическая система, ее основные элементы и варианты применения

2021 ◽  
pp. 55-61
Author(s):  
С.В. Панкин ◽  
А.И. Сюрдо
Keyword(s):  
Detection Efficiency ◽  
Radiation Detection ◽  
Field Of View ◽  
Optimal Configuration ◽  
Minimum Size ◽  
Time Range ◽  
Silicon Photomultipliers ◽  
Radionuclide Diagnostics ◽  
Kinetics Of ◽  
Medical Radionuclide

The paper discusses the main elements of the developed portable radiometric system (PRS) and options for its application. Silicon photomultipliers were used in the development of the PRS detector modules. It made possible to significantly reduce their size. Such devices and systems find their application in solving various problems of medical radionuclide diagnostics that require an increased field of view, an extended research time range and mobility. The main goal of the work was to find the optimal configuration of the PRS elements to ensure its minimum size and, at the same time, the maximum radiation detection efficiency, taking into account the features of the objects under study and the kinetics of the processes occurring in them. In addition, an algorithm for selecting the minimum amount of activity of a radioactive preparation required for each study is additionally considered.

GaN Radiation Detection Research Based on Monte Carlo Method

2014 ◽  
Vol 668-669 ◽  
pp. 1011-1014
Author(s):  
Yang Liu ◽  
Guo Zheng Zhu ◽  
Zhen Ni Xing
Keyword(s):  
Monte Carlo ◽  
Energy Deposition ◽  
Detection Efficiency ◽  
Hadron Collider ◽  
Radiation Detection ◽  
Radiation Energy ◽  
Radiation Detectors ◽  
Detection Mechanism ◽  
Radiation Beam ◽  
The Impact

Gallium nitride (GaN) is the third generation of semiconductor material; it has a large band gap, high thermal conductivity, low dielectric constant, high drift speed, etc. Radiation detectors based on GaN material have small volume, high radiation resistance, and fast response, can be used to replace the existing Large Hadron Collider vertex detector and track detector. Energy deposition characteristic of GaN detectors to radiation beam is an important factor for detection efficiency, and there are many factors that affect the energy deposition characteristics of the detector, like the detection mechanism, the impact of material properties, the type of incident ray, radiation energy, and many other factors. This paper studies the physical properties of GaN detector by calculation based on Monte Carlo simulation. Energy deposition characteristics are discussed respectively for incident γ-ray with different energy, in the front-end and back-end add PTFE material. The results of our study present the theoretical properties of GaN radiation detectors.

Kinetics of the Back Reaction of Photosystem II as Derived from Delayed Light Emission in the Presence of DCMU and the Conformational State of the Thylakoid Membrane

1980 ◽  
Vol 35 (7-8) ◽  
pp. 638-644 ◽  
Author(s):  
Gerhard Vierke
Keyword(s):  
Photosystem Ii ◽  
Light Emission ◽  
Decay Curve ◽  
Conformational State ◽  
Time Range ◽  
Back Reaction ◽  
Luminescence Decay Curve ◽  
Photosynthetic Membrane ◽  
Internal Ph ◽  
Kinetics Of

Abstract It is shown that the kinetics of the back reaction of photosystem II in the seconds time range as derived from the luminescence decay curve in the presence of DCMU is controlled by the internal pH of the thylakoids. Modifications of the conformational state of the photosynthetic membrane while leaving the internal pH unchanged, however, reaction.

NUV Silicon Photomultipliers With High Detection Efficiency and Reduced Delayed Correlated-Noise

2015 ◽  
Vol 62 (3) ◽  
pp. 1318-1325 ◽  
Author(s):  
Fabio Acerbi ◽  
Alessandro Ferri ◽  
Gaetano Zappala ◽  
Giovanni Paternoster ◽  
Antonino Picciotto ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Correlated Noise ◽  
Silicon Photomultipliers ◽  
High Detection ◽  
High Detection Efficiency

Ultra-high cell-density silicon photomultipliers with high detection efficiency

2017 ◽  
Author(s):  
Fabio Acerbi ◽  
Alberto Gola ◽  
Veronica Regazzoni ◽  
Giovanni Paternoster ◽  
Giacomo Borghi ◽  
...  
Keyword(s):  
Cell Density ◽  
High Cell Density ◽  
Detection Efficiency ◽  
High Cell ◽  
Silicon Photomultipliers ◽  
High Detection ◽  
High Detection Efficiency

Low-Flux Neutron Radiation Detection Technology with High Sensitivity

2014 ◽  
Vol 668-669 ◽  
pp. 924-927
Author(s):  
Yang Liu ◽  
Zhen Ni Xing ◽  
Guo Zheng Zhu
Keyword(s):  
Energy Deposition ◽  
Plastic Scintillator ◽  
Detection Efficiency ◽  
Radiation Detection ◽  
High Sensitivity ◽  
Neutron Radiation ◽  
Fission Neutron ◽  
Deposition Flux ◽  
Low Intensity ◽  
Detection Technology

Boron-containing plastic scintillator detectors have a high detection efficiency for low-intensity thermal neutrons and fast neutrons which is currently the preferred types of neutron detector. This article is based on Monte Carlo method, studied boron-containing plastic scintillator for neutron detection performance, and analysis the energy deposition flux characteristics and detection efficiency when low intensity fission neutron incident to the boron plastic scintillator. We obtain the low-flux neutron detector performance in a variety of neutron source energy, boron-containing plastic scintillator diameter and length. Results showed that, when the boron-containing plastic scintillator lengths increase, the energy deposition flux will increase. When the length and diameter is constant, increasing source strength can increase the energy deposition flux brought by the recoil proton to a certain extent. When the source intensity over after thermal neutrons, due to the decrease of the cross section, the energy deposition fluxes brought by the react of neutrons and will decrease. The results provide help for low intensity fission neutron radiation detection technology with high sensitivity.

scholarly journals Modelling of SiPM Performance for Detection of Cherenkov Radiation from Extensive Air Showers in UV and Visible Ranges for Application at the TAIGA-IACT Telescope

2020 ◽  
Vol 57 (1-2) ◽  
pp. 13-21 ◽  
Author(s):  
A.A. Bogdanov ◽  
E.E. Kholupenko ◽  
Yu.V. Tuboltsev ◽  
Yu.V. Chichagov
Keyword(s):  
Background Noise ◽  
Cherenkov Radiation ◽  
Gamma Ray ◽  
Detection Efficiency ◽  
Extensive Air Showers ◽  
Visible Range ◽  
Air Showers ◽  
Silicon Photomultipliers ◽  
High Background ◽  
Low Amplitude

AbstractA novel cluster of sensitive detectors based on silicon photomultipliers (SiPM) is being developed for the Cherenkov gamma-ray telescope TAIGA-IACT (Tunka valley, Republic of Buryatia, Russia). The cluster will be able to detect Cherenkov radiation from extensive air showers in two wide bands: 250–300 nm (UV) and 250–700 nm (visible and UV). Each pixel consists of a Winston cone, 4 SiPMs with the total sensitive area of 144 mm2, and readout electronics based on fast analogue memory. During operation in the UV band, a UV-bandpass filter is used to suppress cluster sensitivity in the visible range. In order to evaluate the detection efficiency of the selected SiPMs, a specific software simulator of SiPM output signal has been developed. This simulator takes into account such inherent parameters of SiPMs as total number of microcells, their recharge time, the dark count rate, the effective detection area, the quantum efficiency, the crosstalk between microcells, as well as conditions of SiPM operation, namely, the background noise and the Ohmic load in the readout (front-end) electronics. With this simulator it is possible to determine the expected trigger threshold under given conditions and parameters of selected detectors. Based on preliminary simulations, OnSemi MicroFJ-60035 SiPM chips have been chosen for the novel cluster of TAIGA-IACT. These SiPMs have sensible efficiency in the ultraviolet range (5–20% in the 250–300 nm band) and are distinguished by the presence of a fast output, which allows one to capture a low amplitude signal above a relatively high background noise.

scholarly journals Characterization of Silicon-Photomultipliers for a Cosmic Muon Veto detector

2021 ◽  
Vol 16 (11) ◽  
pp. P11029
Author(s):  
M. Jangra ◽  
G. Majumder ◽  
M. Saraf ◽  
B. Satyanarayana ◽  
R.R. Shinde ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Light Emitting Diode ◽  
Silicon Photomultipliers ◽  
Light Emitting ◽  
Cosmic Muon ◽  
Veto Detector ◽  
Noise Rate ◽  
In Situ Calibration ◽  
Noise Data ◽  
Basic Characteristics

Abstract A Cosmic Muon Veto (CMV) detector using extruded scintillators is being designed around the mini-Iron Calorimeter detector at the transit campus of the India-based Neutrino Observatory, Madurai for measuring its efficiency at shallow depth underground experiments. The scintillation signal is transmitted through a Wavelength Shifting (WLS) fibre and readout by Hamamatsu Silicon-Photomultipliers (SiPMs). A Light Emitting Diode (LED) system is included on the front-end readout for in-situ calibration of the gain of each SiPM. A characterization system was developed for the measurement of gain and choice of the overvoltage (V ov) of SiPMs using the LED as well as a cosmic muon telescope. The V ov is obtained by studying the noise rate, the gain of the SiPM, and the muon detection efficiency. In case of any malfunction of the LED system during the operation, the SiPM can also be calibrated with the noise data as well as using radioactive sources. This paper describes the basic characteristics of the SiPM and the comparison of the calibration results using all three methods, as well as the V ov of the SiPMs and muon selection criteria for the veto detector.

Investigation of parameters of new MAPD-3NM silicon photomultipliers

2022 ◽  
Vol 17 (01) ◽  
pp. C01001
Author(s):  
F. Ahmadov ◽  
G. Ahmadov ◽  
R. Akbarov ◽  
A. Aktag ◽  
E. Budak ◽  
...  
Keyword(s):  
High Energy Physics ◽  
Gamma Ray ◽  
Detection Efficiency ◽  
High Energy ◽  
Efficiency Gain ◽  
Space Application ◽  
Silicon Photomultipliers ◽  
Photon Detection ◽  
Photon Detection Efficiency ◽  
Energy Physics

Abstract In the presented work, the parameters of a new MAPD-3NM-II photodiode with buried pixel structure manufactured in cooperation with Zecotek Company are investigated. The photon detection efficiency, gain, capacitance and gamma-ray detection performance of photodiodes are studied. The SPECTRIG MAPD is used to measure the parameters of the MAPD-3NM-II and scintillation detector based on it. The obtained results show that the newly developed MAPD-3NM-II photodiode outperforms its counterparts in most parameters and it can be successfully applied in space application, medicine, high-energy physics and security.

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