- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Advances in the measurements of the mass attenuation coefficients
摘要： The knowledge of atomic fundamental parameters, such as mass attenuation coefficients or fluorescence yields with low uncertainties, is of decisive importance in elemental quantification involving X‐ray fluorescence analysis techniques. Several databases providing the mass attenuation coefficients are accessible and frequently used within a large community of users. These compilations are most often in good agreement for photon energies in the hard X‐ray ranges. However, they significantly differ for low photon energies and around the absorption edges of the elements. Mass attenuation coefficients of several elements were determined experimentally in the photon energy range from 100 eV to 35 keV by using monochromatized radiation at the SOLEIL synchrotron (France). The application of high‐accuracy experimental techniques resulted in low uncertainty mass attenuation coefficients. The results are compared with tabulated data.
关键词： photon energy,X‐ray fluorescence analysis,mass attenuation coefficients,SOLEIL synchrotron
更新于2025-09-04 15:30:14
-
Stuctural, optical and radiation shielding properties of zinc boro-tellurite alumina glasses
摘要： In this work, boro-telluride glasses with additional zinc, aluminum, and alkali–alkaline modifiers have been synthesized using the melt-quenching–annealing method. Six glasses were fabricated with composition of [(60 ? x)B2O3–(10 + x)TeO2–10ZnO–10Al2O3–5Li2O–5MgO] all in mol% and x varied from 0, 10, 20, 30, 40 and 50. The aim of this work is to understand the effect of changing the main glass former from B2O3 → TeO2, to obtain new optical materials. To confirm the amorphous nature of these six glasses, X-ray diffraction was characterized for all six glasses from 10° to 80°. Optical absorption with wavelength range 200–800 nm in room temperature was measured, and the optical absorption coefficient α(λ) calculated to obtain the cutoff wavelength. In addition, gamma photons shielding features of the prepared K1–K6 glasses were evaluated by means of some essential parameters such as mass attenuation coefficients (μ/ρ) and effective atomic number (Zeff) at five energies between 0.356 and 1.33 MeV. No significant difference between the theoretical and simulation μ/ρ values was found. The effective atomic number results indiacte that as the TeO2 content increases, the photons’ attenuation increases. The number of interactions of gamma photons with K6 sample (which contains the maximum amount of TeO2) is relatively high (in comparison to the rest of the samples), which results in more attenuation and thus better shielding features for K6.
关键词： Effective atomic number,Mass attenuation coefficients,Gamma photons shielding,Boro-tellurite glasses,Optical materials
更新于2025-09-04 15:30:14