Determination of the total bremsstrahlung photon flux from electron accelerators by simultaneous activation of two monitors

2012 ◽  
Vol 9 (8) ◽  
pp. 648-655 ◽  
Author(s):  
Tran Duc Thiep ◽  
Truong Thi An ◽  
Nguyen Tuan Khai ◽  
Nguyen The Vinh ◽  
Phan Viet Cuong ◽  
...  
Keyword(s):  
Photon Flux ◽  
Bremsstrahlung Photon ◽  
Electron Accelerators ◽  
Simultaneous Activation

scholarly journals Determination of X-ray flux using silicon pin diodes

2009 ◽  
Vol 16 (2) ◽  
pp. 143-151 ◽  
Author(s):  
Robin L. Owen ◽  
James M. Holton ◽  
Clemens Schulze-Briese ◽  
Elspeth F. Garman
Keyword(s):  
Light Source ◽  
Energy Deposition ◽  
Photon Flux ◽  
Macromolecular Crystallography ◽  
Pin Diodes ◽  
Web Based ◽  
X Ray ◽  
Swiss Light Source ◽  
Flux Incident

Accurate measurement of photon flux from an X-ray source, a parameter required to calculate the dose absorbed by the sample, is not yet routinely available at macromolecular crystallography beamlines. The development of a model for determining the photon flux incident on pin diodes is described here, and has been tested on the macromolecular crystallography beamlines at both the Swiss Light Source, Villigen, Switzerland, and the Advanced Light Source, Berkeley, USA, at energies between 4 and 18 keV. These experiments have shown that a simple model based on energy deposition in silicon is sufficient for determining the flux incident on high-quality silicon pin diodes. The derivation and validation of this model is presented, and a web-based tool for the use of the macromolecular crystallography and wider synchrotron community is introduced.

scholarly journals Photon flux determination of a liquid-metal jet X-ray source by means of photon scattering

2019 ◽  
Vol 34 (7) ◽  
pp. 1497-1502 ◽  
Author(s):  
Malte Wansleben ◽  
Claudia Zech ◽  
Cornelia Streeck ◽  
Jan Weser ◽  
Christoph Genzel ◽  
...  
Keyword(s):  
Electron Beam ◽  
Liquid Metal ◽  
Power Density ◽  
Photon Flux ◽  
Beam Power ◽  
Photon Scattering ◽  
X Ray ◽  
Metal Anode ◽  
Metal Jet

Liquid-metal jet X-ray sources promise to deliver high photon fluxes, which are unprecedented for laboratory based X-ray sources, because the regenerating liquid-metal anode is less sensitive to damage caused by an increased electron beam power density.

scholarly journals Rapid and facile chemical actinometric protocol for photo-microfluidic systems using azobenzene and NMR spectroscopy

RSC Advances ◽  
2017 ◽  
Vol 7 (47) ◽  
pp. 29815-29820 ◽  
Author(s):  
Nassim El Achi ◽  
Youssef Bakkour ◽  
Laëtitia Chausset-Boissarie ◽  
Maël Penhoat ◽  
Christian Rolando
Keyword(s):  
Nmr Spectroscopy ◽  
Quantum Yield ◽  
Photon Flux ◽  
Microfluidic Systems

A new protocol for determining the photon flux inside a photomicroreactor is described using (E)-azobenzene and NMR spectroscopy which does not require the determination of the quantum yield of the unstableZisomer.

scholarly journals An accessible visible-light actinometer for the determination of photon flux and optical pathlength in flow photo microreactors

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Anca Roibu ◽  
Senne Fransen ◽  
M. Enis Leblebici ◽  
Glen Meir ◽  
Tom Van Gerven ◽  
...  
Keyword(s):  
Visible Light ◽  
Photon Flux

Determination of photonic efficiency and quantum yield of formaldehyde formation in the presence of various TiO2 photocatalysts

2001 ◽  
Vol 44 (5) ◽  
pp. 279-286 ◽  
Author(s):  
C. Wang ◽  
D.W. Bahnemann ◽  
J.K. Dohrmann
Keyword(s):  
Quantum Yield ◽  
Hydroxyl Radicals ◽  
Critical Concentration ◽  
Photon Flux ◽  
Tio2 Photocatalysts ◽  
Ph Values ◽  
Optimum Ph ◽  
Photonic Efficiency ◽  
True Quantum

Illumination of aqueous TiO2 suspentions yields hydroxyl radicals, which can be trapped by methanol producing formaldehyde (HCHO). In this work, the photonic efficiency and quantum yield of HCHO formation in colloidal TiO2 solutions and, P25 and UV 100 suspensions have been determined. Differences in photocatalytic activity of the three photocatalysts have been found and are discussed. The photonic efficiency of HCHO formation in the presence of P25 and UV 100 depends on the concentration of TiO2 and the pH. The critical concentration is 2.5 g/L. Below this, the photonic efficiency with P 25 is higher than with UV 100, and vice versa. Optimum pH values for P25 and UV 100 giving the maximum photonic efficiency are 7.7 and 10.4, respectively. Compared to P25 and UV 100, the true quantum yield of HCHO formation in colloidal TiO2 solution varies a little with pH and virtually does not change with the amount of loading of TiO2. The true quantum yield varies as the inverse square root of light intensity. The quantum yield increases from 0.02 to 0.08 when the absorbed photon flux decreases from 8.1 × 10-7 Ein/L s to 4.9 × 10-8 Ein/L s. A simple model is presented to explain the experimental observation.

ANN modeling of the bremsstrahlung photon flux in tantalum target

2012 ◽  
Vol 23 (6) ◽  
pp. 1591-1595 ◽  
Author(s):  
Kadir Gunoglu ◽  
Nilgun Demir ◽  
Iskender Akkurt ◽  
Zehra Nur Demirci
Keyword(s):  
Photon Flux ◽  
Bremsstrahlung Photon ◽  
Ann Modeling ◽  
Tantalum Target

scholarly journals A Prediction Study on Bremsstrahlung Photon Flux of Tungsten as a Radiological Anode Material by using MCNPX and ANN Modeling

2017 ◽  
Vol 132 (3) ◽  
pp. 433-435
Author(s):  
H.O. Tekin ◽  
U. Kara ◽  
T. Manici ◽  
E.E. Altunsoy ◽  
T.T. Erguzel
Keyword(s):  
Anode Material ◽  
Photon Flux ◽  
Bremsstrahlung Photon ◽  
Ann Modeling

Simulation of methods for a rapid determination of the energy spectrum of bremsstrahlung from electron accelerators

2004 ◽  
Vol 49 (9) ◽  
pp. 1213-1220 ◽  
Author(s):  
N. G. Mordasov ◽  
D. M. Ivashchenko ◽  
A. M. Chlenov ◽  
A. A. Astakhov
Keyword(s):  
Energy Spectrum ◽  
Rapid Determination ◽  
Electron Accelerators

The U125 insertion device beamline at the Metrology Light Source

2019 ◽  
Vol 26 (2) ◽  
pp. 535-542 ◽  
Author(s):  
Alexander Gottwald ◽  
Hendrik Kaser ◽  
Michael Kolbe
Keyword(s):  
Light Source ◽  
Photoelectron Spectroscopy ◽  
Near Infrared ◽  
Normal Incidence ◽  
Grazing Incidence ◽  
Uncertainty Budget ◽  
Photon Flux ◽  
Insertion Device ◽  
Grating Monochromator

At the Metrology Light Source, an electron storage ring dedicated to metrological applications, the U125 insertion device beamline utilizes undulator radiation for various applications over a broad spectral range. Using a hybrid normal-incidence and grazing-incidence in-vacuum switchable plane-grating monochromator, a spectral region ranging from the near-infrared to soft X-ray is covered. The beamline is dedicated to surface-analytical methods, e.g. ellipsometry, photoelectron spectroscopy or photoemission tomography. The traceability of radiometric quantities, i.e. quantitative determination of the available radiant power (or photon flux), is required for some of these applications to support the metrological aspect of the measurements. In particular, attention is paid to the suppression of unwanted spectral contributions from higher diffraction orders, and to the monitoring of the radiation intensity during the measurements. With the results from the beamline commissioning, an uncertainty budget for all relevant radiometric quantities was established.

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