Method neutron gamma logging for simultaneous measurement of density and porosity layer for well one device

2020 ◽  
Author(s):  
Boris G. Titov ◽  
◽  
Vladimir M. Gruznov ◽  
Keyword(s):  
Gamma Radiation ◽  
Inelastic Scattering ◽  
Simultaneous Determination ◽  
Neutron Irradiation ◽  
Simultaneous Measurement ◽  
Physical Method ◽  
Radiation Capture ◽  
Pulsed Neutron ◽  
Scattering And Radiation

A new nuclear–physical method and scheme of a device for logging gas and oil wells with the simultaneous determination of the density and porosity of the rocks behind the well are substantiated. Density and porosity are determined by one device. The pulsed neutron irradiation of the medium behind the well was used. Density and porosity are determined by gamma radiation from inelastic scattering and radiation capture of rock–forming elements by two spaced apart gamma spectrometric detectors.

About the Retrospective Dosimetry of Mixed Gamma-Neutron Radiation Fields

ANRI ◽  
2020 ◽  
pp. 46-52
Author(s):  
Anatoliy Portman ◽  
Aleksandr Potemkin
Keyword(s):  
Gamma Radiation ◽  
Neutron Irradiation ◽  
Thermal Activation ◽  
Neutron Radiation ◽  
Thermostimulated Luminescence ◽  
Radiation Fields ◽  
Retrospective Dosimetry ◽  
Dose Responses

The article describes research on the development of a method for doses retrospective determination of gamma-neutron irradiation with separation into components has basing on thermostimulated luminescence of quartz. Confirmation of the hypothesis about the different course of dose responses from neutron radiation and gamma radiation under different conditions of building ceramics quartz’s thermal activation is given. The possibility of separation of luminescent signals in quartz caused by gamma radiation or neutron radiation is shown.

HPLC Analysis of 6-Mercaptopurine and Metabolites in Extracellular Body Fluids

1988 ◽  
Vol 25 (5) ◽  
pp. 504-509 ◽  
Author(s):  
J L Rudy ◽  
J C Argyle ◽  
N Winick ◽  
P Van Dreal
Keyword(s):  
Cerebrospinal Fluid ◽  
Solid Phase Extraction ◽  
Simultaneous Determination ◽  
Individual Variation ◽  
Simultaneous Measurement ◽  
Hplc Analysis ◽  
Solid Phase ◽  
Phase Extraction ◽  
Hplc Assay

A convenient HPLC assay, which allows for the simultaneous measurement in extracellular fluids of 6-mercaptopurine and four of its metabolites, 6-thioguanine, 6-mercaptopurine riboside, 6-thioxanthine and 6-thiouric acid is described. Solid phase extraction allows for the clean isolation of analytes from plasma, urine or cerebrospinal fluid. The simultaneous determination of 6-mercaptopurine and some of its major metabolites in extracellular fluids may contribute to the monitoring of patient compliance, bioavailability, and individual variation in metabolism and absorption.

scholarly journals Determination of the response function of the NaI detector for g-quanta with an energy of 4.43 MeV, formed during inelastic scattering of neutrons with an energy of 14.1 MeV on carbon nuclei

2020 ◽  
Vol 4 (4) ◽  
pp. 281-290
Author(s):  
S.B. Dabylova ◽  
Yu.N. Kopach ◽  
S.K. Sakhiyev ◽  
D.N. Grozdanov ◽  
N.A. Fedorov
Keyword(s):  
Gamma Radiation ◽  
Inelastic Scattering ◽  
Fast Neutron ◽  
Response Function ◽  
Gamma Spectrometry ◽  
Scintillation Detector ◽  
Radiation Detection ◽  
Radiation Characteristics ◽  
Detection Medium

The work is devoted to determining the response function of the detector NaI(Tl) for g -quanta with energy of 4.43 MeV, formed during inelastic scattering of neutrons with energy of 14.1 MeV on the nuclei 12C. In gamma spectrometry, output pulses are recorded, the amplitudes of which are proportional to the energy lost in the detection medium by incident photons. One of the main tasks of radiation detection is to restore radiation characteristics from signals measured at the outputs of detectors. For this, it is necessary to know, first of all, the general characteristics of detectors as converters of radiation into signals. The main characteristic of the detector is its response function, which can be defined as the probability that a particle with given properties generates a certain signal in the detector that will be registered by the device. The article presents the results of modeling the response function of a scintillation detector based on a NaI(Tl) crystal for gamma radiation from inelastic fast neutron scattering in order to study the mechanism of its formation.

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

Analysis of STEM micrographs of thick objects

1978 ◽  
Vol 36 (2) ◽  
pp. 106-107
Author(s):  
S. Golladay
Keyword(s):  
Inelastic Scattering ◽  
Multiple Scattering ◽  
Mass Distribution ◽  
Cross Sections ◽  
Phase Contrast ◽  
Image Point ◽  
Contrast Effects ◽  
Total Cross Sections ◽  
Elastic And Inelastic Scattering

The theory of multiple scattering has been worked out by Groves and comparisons have been made between predicted and observed signals for thick specimens observed in a STEM under conditions where phase contrast effects are unimportant. Independent measurements of the collection efficiencies of the two STEM detectors, calculations of the ratio σe/σi = R, where σe, σi are the total cross sections for elastic and inelastic scattering respectively, and a model of the unknown mass distribution are needed for these comparisons. In this paper an extension of this work will be described which allows the determination of the required efficiencies, R, and the unknown mass distribution from the data without additional measurements or models. Essential to the analysis is the fact that in a STEM two or more signal measurements can be made simultaneously at each image point.

Determination of arsenic atom distribution arsenic doped silicon using HOLZ-line analysis

1996 ◽  
Vol 54 ◽  
pp. 976-977
Author(s):  
Y. Kikuchi ◽  
N. Hashikawa ◽  
F. Uesugi ◽  
E. Wakai ◽  
K. Watanabe ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Zone Axis ◽  
Experimental Result ◽  
Background Intensity ◽  
Crystal Thickness ◽  
Arsenic Atom ◽  
Doped Silicon ◽  
P Type ◽  
Line Analysis

In order to measure the concentration of arsenic atoms in nanometer regions of arsenic doped silicon, the HOLZ analysis is carried out underthe exact [011] zone axis observation. In previous papers, it is revealed that the position of two bright lines in the outer SOLZ structures on the[011] zone axis is little influenced by the crystal thickness and the background intensity caused by inelastic scattering electrons, but is sensitive to the concentration of As atoms substitutbnal for Siatomic site.As the result, it becomes possible to determine the concentration of electrically activated As atoms in silicon within an observed area by means of the simple fitting between experimental result and dynamical simulatioan. In the present work, in order to investigate the distribution of electrically activated As in silicon, the outer HOLZ analysis is applied using a nanometer sized probe of TEM equipped with a FEG.Czodiralsld-gown<100>orientated p-type Si wafers with a resistivity of 10 Ώ cm are used for the experiments.TheAs+ implantation is performed at a dose of 5.0X1015cm-2at 25keV.

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