scholarly journals Effective Atomic Number Determination of Rare Earth Oxides with Scattering Intensity Ratio

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
A. Turşucu ◽  
D. Demir ◽  
P. Önder
Keyword(s):  
Rare Earth ◽  
Atomic Number ◽  
Intensity Ratio ◽  
Theoretical Calculations ◽  
Effective Atomic Number ◽  
Incident Beam ◽  
Rare Earth Oxide ◽  
Scattering Intensity ◽  
Effective Atomic Numbers

Effective atomic numbers () of scientific samples (rare earth) were determined experimentally by scattering of 59.54 keV gamma photons from 5 Ci241Am annular radioactive source. The scattered gamma photons were collected by using a high-resolution HPGe semiconductor detector placed at to the incident beam. This experiment was carried out on several elements in the atomic range for 59.54 keV incident photons. Photopeak efficiency and air and sample absorption corrections were performed on Rayleigh to Compton scattering intensity ratio; then the ratio was plotted as a function of atomic number and a fit curve was constituted. The effective atomic numbers of rare earth oxide samples were determined by this fit curve. Also, related parameters were determined by absorption technique with the same incident photon energy. Obtained values from this fit curve were compared to theoretical values and were found to closely agree with theoretical calculations.

Experimental determination of the effective atomic number of inclusion tissue by spectrozonal roentgenography

2006 ◽  
Vol 40 (1) ◽  
pp. 12-15 ◽  
Author(s):  
A. S. Lelyukhin ◽  
E. A. Kornev ◽  
Yu. G. Samakaev ◽  
V. V. Kan’shin ◽  
V. I. Lipatkin
Keyword(s):  
Experimental Determination ◽  
Atomic Number ◽  
Effective Atomic Number

scholarly journals Quantitative determination of the lowest density domain in major fault zones via medical X-ray computed tomography

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Akiyuki Iwamori ◽  
Hideo Takagi ◽  
Nobutaka Asahi ◽  
Tatsuji Sugimori ◽  
Eiji Nakata ◽  
...  
Keyword(s):  
Fault Zone ◽  
Atomic Number ◽  
Density Ratio ◽  
Effective Atomic Number ◽  
Fault Zones ◽  
Ct Number ◽  
Fault Rock ◽  
Major Fault ◽  
X Ray Computed

AbstractDetermination of the youngest active domains in fault zones that are not overlain by Quaternary sedimentary cover is critical for evaluating recent fault activity, determining the current local stress field, and mitigating the impacts of future earthquakes. Considering the exhumation of a fault zone, the youngest active domain in a fault zone is supposed to correspond to the activity at the minimum fault depth of a buried fault, such that the most vulnerable area, which possesses the lowest rock/protolith density ratio, is assumed to be indicative of this recent fault activity. However, it is difficult to measure the density of fault rocks and map the rock/protolith density ratio across a given fault zone. Here, we utilize medical X-ray computed tomography (CT), a non-destructive technique for observing and analyzing materials, to investigate the fault characteristics of several fault zones and their surrounding regions in Japan, and attempt to determine the lowest density domain of a given fault zone based on its CT numbers, which are a function of the density and effective atomic number of the fault rock and protolith. We first investigate the density, void ratio, and effective atomic number of active and inactive fault rocks, and their respective protoliths. We then calculate the CT numbers after reducing the beam-hardening effects on the rock samples and study the relationships among the CT number, density, and effective atomic number. We demonstrate that the density, effective atomic number, and CT number of the fault rock decrease as the youngest active zone, identified by outcrop observation, are approached, such that the region with the lowest CT number and rock/protolith density ratio defines the lowest density domain of a given fault zone. We also discuss the relationship between the lowest density domain and the youngest active domain in major fault zones and investigate the points to be considered when the youngest active domain is identified from the lowest density domain determined by the CT number.

scholarly journals Indirect determination of lanthanum in a mixture of rare earth oxide

1974 ◽  
Vol 23 (1) ◽  
pp. 86-88
Author(s):  
Yoshiro TOMIDA ◽  
Ken-ichi TAKADA ◽  
Wataru FUNASAKA
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxide ◽  
Indirect Determination
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