Dependence of quantum efficiency of alkali halide photocathodes on the radiation incidence angle

1999 ◽  
Author(s):  
Anton S. Tremsin ◽  
Oswald H. W. Siegmund
Keyword(s):  
Quantum Efficiency ◽  
Alkali Halide ◽  
Incidence Angle ◽  
Radiation Incidence

scholarly journals Method for fast determination of the angle of ionizing radiation incidence from data measured by a Timepix3 detector

2021 ◽  
Vol 10 (1) ◽  
pp. 63-70
Author(s):  
Felix Lehner ◽  
Jürgen Roth ◽  
Oliver Hupe ◽  
Marc Kassubeck ◽  
Benedikt Bergmann ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Incidence Angle ◽  
Computation Time ◽  
Incident Radiation ◽  
Angle Of Incidence ◽  
Time Behavior ◽  
Calculation Algorithm ◽  
3D Geometry ◽  
Photon Event ◽  
Radiation Incidence

Abstract. This paper presents a method of how to determine spatial angles of ionizing radiation incidence quickly, using a Timepix3 detector. This work focuses on the dosimetric applications where detectors and measured quantities show significant angle dependencies. A determined angle of incidence can be used to correct for the angle dependence of a planar Timepix3 detector. Up until now, only passive dosemeters have been able to provide a correct dose and preserve the corresponding incidence angle of the radiation. Unfortunately, passive dosemeters cannot provide this information in “real” time. In our special setup we were able to retrieve the spatial angles with a runtime of less than 600 ms. Employing the new Timepix3 detector enables the use of effective data analysis where the direction of incident radiation is computed from a simple photon event map. In order to obtain this angle, we combine the information extracted from the map with known 3D geometry surrounding the detector. Moreover, we analyze the computation time behavior, conditions and optimizations of the developed spatial angle calculation algorithm.

Alpha Radiation Incidence Angle Influence on Planar FDSOI nMOSFET

2019 ◽  
Vol 39 (1) ◽  
pp. 85-92
Author(s):  
Robson A. Magalhães ◽  
Paula G. Agopian ◽  
Marcilei A. Silveira ◽  
Renato C. Giacomini
Keyword(s):  
Incidence Angle ◽  
Alpha Radiation ◽  
Radiation Incidence

Quantum efficiencies in a multi-annular photocatalytic reactor

2007 ◽  
Vol 55 (12) ◽  
pp. 161-166 ◽  
Author(s):  
G.E. Imoberdorf ◽  
H.A. Irazoqui ◽  
A.E. Cassano ◽  
O.M. Alfano
Keyword(s):  
Mathematical Model ◽  
Quantum Efficiency ◽  
Absorption Efficiency ◽  
Radiative Energy ◽  
Radiation Absorption ◽  
Reactor Radiation ◽  
Photocatalytic Reactor ◽  
Operating Variables ◽  
Radiation Incidence

Radiative energy efficiencies of a multi-annular photocatalytic reactor were evaluated and analysed. The total quantum efficiency, defined as the ratio of the number of molecules of the pollutant reacted to the number of photons emitted by the lamp, is expressed as the product of three factors: (i) the reactor radiation incidence efficiency, (ii) the catalyst radiation absorption efficiency, and (iii) the overall reaction quantum efficiency. By means of a detailed mathematical model, the numerical values of each one were 83, 92, and 0–2.5%, respectively. The dependence of the overall reaction quantum efficiency upon operating variables was also studied.

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