• Detection of Anti-Personnel Landmines using Neutrons

    2015-10-6  Neutron- and gamma-based methods for landmine detection have now reached a level of development at which they are ready for field testing. A convincing success in field tests will be required in order for detectors of this type to be considered as components of future multisensor mine detection

  • Buried mine detection using gamma rays produced by ...

    Author: Thomas Witten
  • Scientists Detect Crab Nebula Using Innovative

    2020-6-2  Scientists have detected gamma rays from the Crab Nebula, the most famous of supernova remnants, using a next-generation telescope that opens the door for astrophysicists to study some of the most energetic and unusual objects in the universe.

  • Buried mine detection using gamma rays produced by ...

    The elements in the explosive of a buried mine are carbon, nitrogen, oxygen, and hydrogen. This paper analyzes data taken on buried explosive simulants. The gamma detector was a high purity germanium crystal with excellent energy resolution and the neutrons were produced by a compact deuterium-tritium accelerator, which generated 14 MeV neutrons.

  • University of Alabama assists in detection of Crab

    University of Alabama assists in detection of Crab Nebula gamma rays using innovative telescope. By University of Alabama. June 13, 2020 The Schwarzschild-Couder Telescope in Arizona detected gamma ray showers from the Crab Nebula in early 2020. University of Alabama researchers are part of the international team of scientists involved in the ...

  • Radiation characteristics of natural gamma-ray from

    位置: 8600 Rockville Pike, Bethesda, MD
  • Gamma-ray Detectors - Introduction

    2012-2-17  Gamma-ray detectors can be placed in two broad classes. The first are what would typically be called spectrometers or photometers in optical astronomy. These are instruments which are "light buckets" and focus on a region of the sky containing the object of

  • Radiation characteristics of natural gamma-ray from

    The experiments results demonstrate the feasibility of using natural gamma-ray technology to perform real-time detection of refuse content of drawn coal and gangue mixture and the availability of ...

  • Gamma-Ray Detection with Scintillators

    Gamma-ray interactions with matter . There are three dominant gamma-ray interactions with matter: Photoelectric effect; Compton effect; Pair production ; The photoelectric effect is a common interaction between a low-energy gamma ray and a material. In this process the photon interacts with an electron in the material losing all of its energy.

  • Detection of gamma photons using solution-grown

    Cheap and sensitive gamma-ray detectors are desired for defence, medical and research applications. Solid-state gamma-radiation detectors made from solution-grown perovskites have now been ...

  • GAMMAJET—FIXED-WING GAMMA SURVEY FOR THE

    al production using aerial gamma ray measurements. Technical details are given on how to manage measurement tasks, and information is also given on what is detectable from an aeroplane and how it is detected. The ability to use the airborne detection system has been tested to reveal the use of undeclared nuclear material.

  • LANDMINE DETECTION TECHNOLOGIES TO FACE THE

    As mine detection using GPR becomes very complex in the presence of clutter, its outcome depends on the knowledge of prevailing environmental conditions, soil texture and moisture [50]. These factors should be studied in the most affected areas of Antioquia (Tarazá, Guadalupe, Ituango, Toledo, Anorí and Campamento [3]), and tests should be ...

  • Development of landmine detection system based on

    The landmine detection system was developed by assembling the neutron source and detectors described in Section 2.1.As shown in Fig. 2, a system combining the three γ-ray detectors and two 3 He detectors was installed. LiF powder of 5 cm thickness and a LiF plate of 1.27 cm thickness were set at positions between the neutron source and the detectors as neutron shielding to reduce activation ...

  • Critical assessment of the MEDUSA gamma ray

    The HPGe has better advantage over MEDUSA in terms of resolution and this means that the gamma ray energy peaks have better visibility than on the MEDUSA. The field measurements on the tailings dam were done using the MEDUSA mounted on a 4x4 vehicle, and simultaneously sample points were identified and samples collected.

  • Gamma ray refraction could launch nuclear photonics

    They analyzed the gamma rays produced using ILL’s PN-3 facility through two silicon crystals, the first preselecting them as they came out of the reactor and directing them into a very narrow and parallel beam. Farther along the instrument, a silicon prism was placed at a height where it refracted half of the gamma ray beam.

  • Detection limit for Gamma Spectrometry? -

    I want to calculate the detection limit using the following formula L D = 2.71 +3.29 (BACKGROUND COUNTS)^0.5 In 200 keV region there is a visible peak (assume >L C ). In 300 keV region there is no ...

  • Method for on-line evaluation of materials using

    Method and apparatus for measuring incombustible content of particulate material, particularly coal mine dust, includes placing a sample of the particulate material in a container to define a pair of angularly oriented surfaces of the sample, directing an incident gamma-ray beam from a radiation source at one surface of the sample and detecting gamma-ray backscatter from the other surface of ...

  • Appendix M X-RAY BACKSCATTER (PAPER II)

    2010-12-7  X-RAY BACKSCATTER (PAPER II) Alan Jacobs and Edward Dugan, University of Florida1 SYNOPSIS In the presence of realistic soil inhomogeneities and surface clutter, employment of high-energy photon radiation (x rays or gamma rays) for landmine detection requires mine-feature imaging with centime-ter spatial resolution.

  • LAB 1: Basic phenomenology of NaI(Tl) gamma ray

    2020-1-11  LAB 1: Basic phenomenology of NaI(Tl) gamma ray detector, MCA, statistics . The objective of this lab is to set up a basic radiation (γ-ray) detection experiment, take some data and explore basic elements of analysis common to the experiments that will be performed later during the semester. The objective is not to finish first ;)

  • 最新研究进展 -MedSci.cn 相关研究进展 -MedSci.cn

    Mechanisms of Cr and Mo Enrichments in the Passive Oxide Film on 316L Austenitic Stainless Steel 第一作者:Wang, ZC 期刊: FRONTIERS IN MATERIALS, 2019; 6 ()

  • Experimental optimization of a landmine detection

    Table 1 Total neutron and gamma dose equivalent rate (uSvh"1) due to the landmine detection system Distance/m_____Gamma ray_____Neutrons_____ 1 0.32 35.5 2 0.08 8.6 3 0.03 3.8 4 - 2.1 5 Conclusion Comparing the results of this paper with Ref.[13], where a landmine detection system of 252Cf was used as the neutron source, the best moderator ...

  • Radon and gamma-radiation measurements in

    On the territory of the abandoned uranium mine “Žirovski vrh”, Slovenia, indoor radon and gamma dose rate measurements were carried out in nineteen schools from February 10 to May 10, 1995, using scintillation cells and etched track detectors for radon and thermoluminescence dosimeters for gamma-ray detection. In five schools indoor radon levels exceeded 400 Bqm-3, which is the proposed ...

  • Mine detector system - The United States of America

    1977-1-18  This spectral distribution is schematically represented in FIG. 2 which shows the gamma ray intensity measured by detector 24 as a function of the energy of the gamma rays wherein K 1 is a characteristic peak at the particular angle of scattering from TNT. If gamma rays 20 are also beamed into the ground 12, detector 26 will sense the ...

  • Primary gamma ray selection in a hybrid timing/imaging ...

    2018-9-16  against showers from the cosmic ray background. The modern version of IACT implementation is stere-oscopy [3], requiring a system of two or more imaging telescopes located at a distance of ˘100 m from each other [4]. The reason for using stereoscopy is the ability to deter-mine the core position of a gamma ray shower, as well as

  • 最新研究进展 -MedSci.cn 相关研究进展 -MedSci.cn

    Mechanisms of Cr and Mo Enrichments in the Passive Oxide Film on 316L Austenitic Stainless Steel 第一作者:Wang, ZC 期刊: FRONTIERS IN MATERIALS, 2019; 6 ()

  • HPGe Detectors Spectrometers – Healvita Group

    This is accomplished using amplitude electric signals and their amplification for further registration with a nuclear physics apparatus. It is also intended for use as the gamma and X-ray detection component of radiological monitoring equipment for environmental objects in nuclear energetics, industrial production, agriculture, medicine, etc.

  • Appendix M X-RAY BACKSCATTER (PAPER II)

    2010-12-7  X-RAY BACKSCATTER (PAPER II) Alan Jacobs and Edward Dugan, University of Florida1 SYNOPSIS In the presence of realistic soil inhomogeneities and surface clutter, employment of high-energy photon radiation (x rays or gamma rays) for landmine detection requires mine-feature imaging with centime-ter spatial resolution.

  • Remote detection of radioactive hotspot using a

    2020-6-19  individually using each gamma-ray event datum acquired while moving. Furthermore, by drawing the image of the radioactive substances on a 3D topogra-phy modelof the measurementarea acquiredby a3D-LiDAR (Light Detection and Ranging) system, the distribution of the radioactive substance can be visua-lized three-dimensionally in consideration of the

  • Extreme emission seen from γ-ray bursts

    Astrophysical explosions known as γ-ray bursts (GRBs) can release in one second the amount of energy that the Sun will produce in its entire lifetime 1.The emission from GRBs covers a broad ...

  • Gamma-ray measurements of naturally occurring

    2002-12-26  University of Cyprus, using a high-resolutionγ−ray spectroscopic system. 2. Experimental method 2.1 Gamma-ray detection system A stand-alone high-resolution spectroscopic system is used for the measurement of the energy spectrum of the emitted gamma rays in

  • Remote detection of radioactive hotspot using a

    2020-6-19  individually using each gamma-ray event datum acquired while moving. Furthermore, by drawing the image of the radioactive substances on a 3D topogra-phy modelof the measurementarea acquiredby a3D-LiDAR (Light Detection and Ranging) system, the distribution of the radioactive substance can be visua-lized three-dimensionally in consideration of the

  • Critical assessment of the MEDUSA gamma ray

    The HPGe has better advantage over MEDUSA in terms of resolution and this means that the gamma ray energy peaks have better visibility than on the MEDUSA. The field measurements on the tailings dam were done using the MEDUSA mounted on a 4x4 vehicle, and simultaneously sample points were identified and samples collected.

  • Design Study of an Underground Detector for

    Since 2006 an underground laboratory is in operation in Unirea salt mine from Slanic Prahova Romania. A new rotatable detector for measurements of the directional variation of the muon flux has been designed and will be put in operation at the end of 2013. The detector will be used to investigate the possible presence of unknown cavities in the salt ore.

  • In situ gamma ray measurements of radionuclides at a ...

    In Situ gamma ray spectroscopy as a survey tool has been successfully applied to assess radionuclide concentrations in various geographical environments. A transportable and robust gamma ray detection system (GISPI) was therefore employed to determine the concentrations of naturally occurring radionuclides at a disused phosphate mine on the ...

  • Using Imaging Spectroscopy To Map Acidic Mine

    2019-5-25  Integration of airborne CASI and gamma ray data for mine site characteristaion. Journal of Spatial Science 2006, 51 (2) , 163-175. DOI: 10.1080/14498596.2006.9635090. Patrick C. Pinet, Charly Kaufmann, Joachim Hill.

  • Gamma-ray measurements of naturally occurring

    2002-12-26  University of Cyprus, using a high-resolutionγ−ray spectroscopic system. 2. Experimental method 2.1 Gamma-ray detection system A stand-alone high-resolution spectroscopic system is used for the measurement of the energy spectrum of the emitted gamma rays in

  • Extreme emission seen from γ-ray bursts

    Astrophysical explosions known as γ-ray bursts (GRBs) can release in one second the amount of energy that the Sun will produce in its entire lifetime 1.The emission from GRBs covers a broad ...

  • Comparative study of precise measurements of

    The measured concentrations of natural radionuclides using in-situ NaI(Tl) γ-ray spectrometry are determined through measurements of the naturally occurring terrestrial gamma radiation of 40 K ...

  • electromagnetic radiation - How can we detect X-rays ...

    2020-5-16  X-rays and gamma rays can be detected by using a scintillation detector. The scintillation detector comprises of NaI (Tl) crystal (scintillator) fixed tightly on a photomultiplier tube in a Gamma Ray spectrometer. For detection and measurement of gamma rays one inch or more thick scintillator in used. For X-rays thin scintillator is used.

  • “Mining” Water Ice on Mars

    2016-11-18  signature in gamma ray and neutron data, and less than ~10 meters, based on the lack of a detection of a shallow soil-ice interface in SHARAD data.” Firn Layer. Typically found on terrestrial glaciers and ice sheets - a layer of granulated snow and ice crystals that is