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- W4300577900 abstract "The full-energy peak efficiency in a particular geometry of a collimated 3 mm × mm2 Si(Li) detector with 0.5 mil thick beryllium and Mylar windows was determined over the energy range 3.3–136 keV by measuring the absolute intensities of X- and low-energy γ-rays from the decays of intensity-calibrated sources of 241Am, 57Co, 137Cs and 65Zn. The measured efficiencies were fitted to a simple analytic function of photon energy, with the fit showing good agreement with the data over the entire range of energies. The physical basis of the model as well as the meaningfulness of its parameters is discussed. A discrepancy between the fit and the measured efficiency of the 17.75 keV Lβ + Lη X-rays from 241Am decay required a re-evaluation of the intensity per decay for these transitions. Some peculiarities of the low-energy efficiency response are discussed and are attributed to source self-absorption effects. The extension of the calibration to lower energies would be possible if more low-energy photon sources with known X-ray intensities were available. The use of L X-rays and L/K intensity ratios calculated from published data for medium-Z elements is discussed and is considered to be feasible for this extension purpose. Some radio-nuclides that are likely to be useful in the low-energy region are suggested." @default.
- W4300577900 created "2022-10-03" @default.
- W4300577900 date "1965-02-01" @default.
- W4300577900 modified "2023-09-26" @default.
- W4300577900 title "Electron impact desorption of carbon monoxide from tungsten" @default.
- W4300577900 doi "https://doi.org/10.1016/0042-207x(65)90680-9" @default.
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