Specially,the average efficient attenuation coefficient in the FTO is 0.838cm~(-1) for tungsten with precision of 4.5% and 0.297cm~(-1) for copper with precision of 5.0%.
The relation between the line attenuation coefficient and the material thickness of FTO has been studied, and the function between them has been given.
Griem,we improve Unsold's method for determining the electron density in stellar atmosphere using the intensities of hydrogen lines,and use the improved method to calculate the electron densities in the atmospheres of 112 stars of type B0—F2 and luminosity clas Ⅴ,Ⅲ,Ⅰa and Ⅰb.
Compares the single and dual-energy X-ray transmission technology and analyzes the difference between them. It is found that how the mass attenuation coefficients of two materials change are different even their atomic numbers are the same when the incident energies are different. It implies that when irradiated by dual energy X-ray,i.
It is based on optimization of the CT-scanner output characteristic (the dependence of the measured linear attenuation coefficient on the calculated value).
This bias was reduced by replacing 0.096?cm-1 in the transformation by the linear attenuation coefficient of 0.093?cm-1 obtained from germanium-68 transmission scans.
Known relationships describing the dependence of the linear attenuation coefficient on the radius and the index of refraction of a spherulite can be applied in evaluations.
Tomographic images are maps of the spatial variations within a specimen of the average linear attenuation coefficient for the input X-ray spectrum, a quantity that depends strongly on mass density and also on atomic number.
Improvement in fitting the observed photospheric radiation field is noted over a model in which the line absorption coefficient is constant with depth.
Measurements of the circular polarization V in different lines show that the deduced magnetic field strength and flux are systematically influenced by variations of the line absorption coefficient from photosphere to spot and faculae.
Account is taken of the change in the state of polarization of multiply diffracted X-rays in mosaic crystals, and a more rigorous treatment of secondary extinction is given. Separate expressions for the transmitted, and multiply diffracted power are obtained, which enable the effective absorption coefficient to be calculated.
On the basis of the theory of the absorption coefficient of hydrogen line, taking accouut of the effects of both ions and electrons,developed recently by A.C.Kolb and H.R.Griem,we improve Unsold's method for determining the electron density in stellar atmosphere using the intensities of hydrogen lines,and use the improved method to calculate the electron densities in the atmospheres of 112 stars of type B0—F2 and luminosity clas Ⅴ,Ⅲ,Ⅰa and Ⅰb.The results of our calculation are given in Table 3. The results...
Effect of H2 on the absorption coefficients have been investigated with Nicolet 170sx FTIR spectroscopy. The variation of absorption coefficients of P(6) and R(5) lines of CO has been observed while 0-450 torr H2 was added to 7 torr of CO. The absorption coefficients of P(6), R(5), P(9) and R(9) lines of pure CO have been determined, and the concentration ranges in which Beer's law is suitable have also been examined.
线吸收系数
linear attenuation coefficient
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