DENTAL ENAMEL EPR DOSIMETRY: COMPARATIVE TESTING OF THE SPECTRA PROCESSING METHODS FOR DETERMINATION OF RADIATION-INDUCED SIGNAL AMPLITUDE

2010 ◽  
Vol 98 (2) ◽  
pp. 345-351 ◽  
Author(s):  
A I. Ivannikov ◽  
D Sanin ◽  
M Nalapko ◽  
V F. Skvortsov ◽  
V F. Stepanenko ◽  
...  
Keyword(s):  
Dental Enamel ◽  
Signal Amplitude ◽  
Comparative Testing ◽  
Processing Methods ◽  
Epr Dosimetry ◽  
Radiation Induced ◽  
Spectra Processing ◽  
Induced Signal

Use of OSL and TL of Electronic Components of Portable Devices for Retrospective Accident Dosimetry

2013 ◽  
Vol 347 ◽  
pp. 229-245 ◽  
Author(s):  
A.S. Pradhan ◽  
J.I. Lee ◽  
J.L. Kim
Keyword(s):  
Mobile Phones ◽  
Rapid Determination ◽  
Radiation Sensitivity ◽  
Optically Stimulated Luminescence ◽  
Portable Devices ◽  
Electronic Components ◽  
Mp3 Players ◽  
Radiation Induced ◽  
Induced Signal

Growing apprehensions of radiological accidents and terroristic attacks have intensified research efforts to find materials with appropriate radiation sensitivity that are carried close to human body, are ubiquitously available and which can be used as fortuitous dosimeters in rapid determination of doses of individuals after radiation exposure. In this respect, thermoluminescence (TL) and optically stimulated luminescence (OSL) of chip cards and electronic components of personal objects have been recently evaluated by researchers in several countries. OSL and TL signal of chip cards is attributed to SiO2 grains contained in the epoxy layers used for controlling the thixotropic properties whereas the radiation induced signal in electronic components (resistors, resonators, capacitors, ICs, antenna switches, etc.) of personal objects (mobile phones, USB flash drive, MP3 players, etc.) is attributed to the ceramic contents, especially to Al2O3 based substrates.

Analysis of Stall Precursors and Determination of Optimum Signal Processing Methods for an LM-2500 Gas Turbine

2008 ◽  
Author(s):  
Knox T. Millsaps ◽  
Gustave C. Dahl ◽  
Daniel E. Caguiat ◽  
Jeffrey S. Patterson
Keyword(s):  
Time Series ◽  
Signal Processing ◽  
Gas Turbine ◽  
Rotor Speed ◽  
Processing Methods ◽  
Turbine Engine ◽  
Pressure Signal ◽  
Time Series Analyses ◽  
Signal Processing Methods

This paper presents an analysis of data taken from several stall initiation events on a GE LM-2500 gas turbine engine. Specifically, the time series of three separate pressure signals located at compressor stages 3, 6, and 15 were analyzed utilizing various signal processing methods to determine the most reliable indicator of incipient stall for this engine. The spectral analyses performed showed that rotating precursor waves traveling around the annulus at approximately half of the rotor speed were the best indicators. Non-linear chaotic time series analyses were also used to predict stall, but it was not as reliable an indicator. Several algorithms were used and it was determined that stall wave perturbations can be reliably identified about 900 revolutions prior to the stall. This work indicates that a single pressure signal located at stage 3 on an LM-2500 gas turbine is sufficient to provide advance warning of more than 2 seconds prior to the fully developed stall event.

Radiation Induced Free-Radicals for EPR Dosimetry Applications

Silicon ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 2671-2675
Author(s):  
S. M. Gafar ◽  
M. A. El-Kelany
Keyword(s):  
Free Radicals ◽  
Epr Dosimetry ◽  
Radiation Induced

Determination of the Endocardial Signal Amplitude in Single Chamber Demand Pacemakers: Comparison of two Measurement Methods

1985 ◽  
pp. 33-44 ◽  
Author(s):  
U. J. Winter ◽  
M. Höher ◽  
D. W. Behrenbeck ◽  
K. P. Liertz ◽  
J. Missler ◽  
...  
Keyword(s):  
Signal Amplitude ◽  
Measurement Methods ◽  
Single Chamber

Use of Multiple Standards for Absorption Correction and Quantitation with Frieda

1973 ◽  
Vol 17 ◽  
pp. 269-278
Author(s):  
P. S. Ong ◽  
E. L. Cheng ◽  
G. Sroka
Keyword(s):  
Dry Mass ◽  
High Energy ◽  
Exciting Radiation ◽  
X Ray ◽  
Mass Absorption ◽  
Iron Copper ◽  
Absorption Correction ◽  
Radiation Induced ◽  
Fluorescence Radiation

AbstractThe computerized fluorescence radiation induced energy dispersive analyzer (FRIEDA) (1) described earlier uses an x-ray beam with a well defined energy for the excitation of fluorescence radiation, and an Si(Li) detector to measure the total x-ray spectra emitted. Such a system can also simultaneously provide supplemental data for the determination of the dry mass and the sample mass absorption which is necessary for accurate quantitation of the results. This instrumental capabillty has been utilized in the measurement of the trace elements iron, copper, and zinc in serum.Known amounts of two elements are thoroughly mixed with the sample. One element has a ‘high energy’ K line, the other a ‘low energy’ K line. The ratio of these intensities, in the absence of absorption, is a known constant and dependent only on the relative amounts of the respective elements, and on the energy of the exciting radiation. Whenever absorption is present, the ratio will change in a manner directly related to the mass absorption of the sample for these radiations.

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