上腭
发表于 2025-3-23 13:11:30
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deforestation
发表于 2025-3-23 15:46:20
,Dispersion as a function of ‘d’ spacing,LiF is commonly used as an analysing crystal. The (200) reflection planes are commonly used, having a “.” value of 4.028 Å. It is, however, possible to use reflecting planes with other Miller indices (hkl) for example the (220), the (420) and the (422) planes.
打包
发表于 2025-3-23 19:21:20
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馆长
发表于 2025-3-24 01:56:27
,Pulse height selection — crystal fluorescence,It is necessary to set up an X-ray spectrometer for the measurement of sodium in a series of rock specimens. An argon/methane flow counter is being employed and a KAP (potassium hydrogen phthalate) analysing crystal. The rock samples contain quite a lot of calcium and this leads to strong crystal fluorescence.
Liability
发表于 2025-3-24 03:24:26
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Heterodoxy
发表于 2025-3-24 09:57:30
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混乱生活
发表于 2025-3-24 14:30:32
Count rate differences with Geiger and proportional counters,A silicon specimen is being examined using nickel filtered Cu K. radiation. The intensities of two reflections are measured with a Geiger-Müller counter and the following counting rates obtained:
tenuous
发表于 2025-3-24 15:36:53
Dispersion of the diffractometer,The dispersion of the diffractometer (dθ/dλ) can be expressed in the given form obtained by differentiating the Bragg law . = 2.sin. .where the angular separation (dθ) of two wavelengths separated by (dλ) is expressed in terms of the diffraction angle θ for a certain spacing ..
Exterior
发表于 2025-3-24 20:48:01
,Counting statistics — variation of standard deviation with counting time,A certain analysis line gave 800 c/s under certain instrumental conditions. Given that the standard deviation (σ) of a given number of counts (.) is equal to √ ., calculate the standard deviation expected in a counting time of 20 seconds.
Crayon
发表于 2025-3-25 01:04:15
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