Proton and hydrogen atom detection efficiency of resistance strip magnetic electron multiplier particle‐counting system

1976 ◽  
Vol 47 (10) ◽  
pp. 1255-1257 ◽  
Author(s):  
P. J. Wehrenberg ◽  
K. C. Clark
Keyword(s):  
Hydrogen Atom ◽  
Detection Efficiency ◽  
Counting System ◽  
Electron Multiplier ◽  
Particle Counting ◽  
Atom Detection ◽  
Magnetic Electron

Electron Multiplier Efficiency for Hydrogen Atom Detection

1970 ◽  
Vol 41 (9) ◽  
pp. 1282-1283 ◽  
Author(s):  
R. H. McKnight ◽  
D. H. Crandall ◽  
D. H. Jaecks
Keyword(s):  
Hydrogen Atom ◽  
Electron Multiplier ◽  
Atom Detection

scholarly journals Multiple ion counting measurement strategies by SIMS – a case study from nuclear safeguards and forensics

2015 ◽  
Vol 30 (12) ◽  
pp. 2516-2524 ◽  
Author(s):  
P. M. L. Hedberg ◽  
P. Peres ◽  
F. Fernandes ◽  
L. Renaud
Keyword(s):  
Nuclear Safeguards ◽  
Counting System ◽  
Electron Multiplier ◽  
Measurement Strategies ◽  
Nuclear Safeguards And Forensics ◽  
Isotope Measurements

This paper describes and discusses how isotope measurements of low content uranium materials can be optimized using a multi-ion counting system consisting of five discrete dynode electron multiplier (EM) detectors.

scholarly journals Large High-Efficiency Thermal Neutron Detectors Based on the Micromegas Technology

Universe ◽  
2018 ◽  
Vol 4 (12) ◽  
pp. 134 ◽  
Author(s):  
Georgios Tsiledakis ◽  
Alain Delbart ◽  
Daniel Desforge ◽  
Ioanis Giomataris ◽  
Thomas Papaevangelou ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Large Scale ◽  
High Efficiency ◽  
Detection Efficiency ◽  
Rate Capability ◽  
High Rate ◽  
Thermal Neutrons ◽  
Neutron Detectors ◽  
Electron Multiplier ◽  
Detection Techniques

Due to the so-called 3He shortage crisis, many detection techniques for thermal neutrons are currently based on alternative converters. There are several possible ways of increasing the detection efficiency for thermal neutrons using the solid neutron-to-charge converters 10B or 10B4C. Here, we present an investigation of the Micromegas technology. The micro-pattern gaseous detector Micromegas was developed in the past years at Saclay and is now used in a wide variety of neutron experiments due to its combination of high accuracy, high rate capability, excellent timing properties, and robustness. A large high-efficiency Micromegas-based neutron detector is proposed for thermal neutron detection, containing several layers of 10B4C coatings that are mounted inside the gas volume. The principle and the fabrication of a single detector unit prototype with overall dimension of ~15 × 15 cm2 and its possibility to modify the number of 10B4C neutron converter layers are described. We also report results from measurements that are verified by simulations, demonstrating that typically five 10B4C layers of 1–2 μm thickness would lead to a detection efficiency of 20% for thermal neutrons and a spatial resolution of sub-mm. The high potential of this novel technique is given by the design being easily adapted to large sizes by constructing a mosaic of several such detector units, resulting in a large area coverage and high detection efficiencies. An alternative way of achieving this is to use a multi-layered Micromegas that is equipped with two-side 10B4C-coated gas electron multiplier (GEM)-type meshes, resulting in a robust and large surface detector. Another innovative and very promising concept for cost-effective, high-efficiency, large-scale neutron detectors is by stacking 10B4C-coated microbulk Micromegas. A prototype was designed and built, and the tests so far look very encouraging.

Soot Emission Behavior from Diverse Vehicles and Catalytic Technologies Measured by a Solid Particle Counting System

2007 ◽  
Author(s):  
Rahman M. Montajir ◽  
Takeshi Kusaka ◽  
Inoue Kaori ◽  
Nobutaka Kihara ◽  
Ichiro Asano ◽  
...  
Keyword(s):  
Solid Particle ◽  
Soot Emission ◽  
Counting System ◽  
Particle Counting ◽  
Emission Behavior

scholarly journals Experimental characterization of the COndensation PArticle counting System for high altitude aircraft-borne application

2008 ◽  
Vol 1 (1) ◽  
pp. 321-374 ◽  
Author(s):  
R. Weigel ◽  
M. Hermann ◽  
J. Curtius ◽  
C. Voigt ◽  
S. Walter ◽  
...  
Keyword(s):  
High Altitude ◽  
Ambient Pressure ◽  
Particle Diameter ◽  
The Arctic ◽  
Working Fluid ◽  
Counting System ◽  
Dual Channel ◽  
Particle Counting ◽  
Condensation Particle Counting

Abstract. This study aims at a detailed characterization of an ultra-fine aerosol particle counting system for operation on board the Russian high altitude research aircraft M-55 "Geophysica" (maximum ceiling of 21 km). The COndensation PArticle counting Systems (COPAS) consists of an aerosol inlet and two dual-channel continuous flow Condensation Particle Counters (CPCs). The aerosol inlet, adapted for COPAS measurements on board the M-55 "Geophysica", is described concerning aspiration, transmission, and transport losses. The counting efficiencies of the CPCs using the chlorofluorocarbon FC-43 as the working fluid are studied experimentally at two pressure conditions, 300 hPa and 70 hPa. Three COPAS channels are operated with different temperature differences between the saturator and the condenser block yielding smallest detectable particle sizes (dp50 – as 50% detection "cut off" diameters) of 6 nm, 11 nm, and 15 nm, respectively, at ambient pressure of 70 hPa. The fourth COPAS channel is operated with an aerosol heating line (250°C) for a determination of the non-volatile number of particles. The heating line is experimentally proven to volatilize pure H2SO4-H2O particles for a particle diameter (dp) range of 11 nm<dp<200 nm. Additionally this study includes investigation to exclude auto-nucleation of the working fluid inside the CPCs. An instrumental inter-comparison (cross-correlation) has been performed for several measurement flights and mission flights in the Arctic and the Tropics are discussed. Finally, COPAS measurements are used for an aircraft plume crossing analysis.

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