Line shape of 57Co sources exhibiting self absorption
| Autor: | Hartmut Spiering, D. L. Nagy, László Bottyán, Olaf Leupold, Zoltán Németh, Csilla Bogdán, Joachim Kusz, Vadim Ksenofontov, L. Deák |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Nuclear and High Energy Physics Forward scatter Chemistry Diffusion Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Spectral line Crystal 03 medical and health sciences Crystallography 030104 developmental biology 0103 physical sciences Mössbauer spectroscopy Physical and Theoretical Chemistry Absorption (chemistry) 010306 general physics Single crystal Hyperfine structure |
| Zdroj: | Hyperfine Interactions. 237 |
| ISSN: | 1572-9540 0304-3843 |
| Popis: | The effect of selfabsorption in Mossbauer sources is studied in detail. Spectra were measured using an old 57Co/Rh source of 74MBq activity with an original activity of ca. 3.7GBq and a 0.15GBq57Co/α − Fe source magnetized by an in-plane magnetic field of 0.2 T. The 57Co/α − Fe source of a thickness of 25 μ was used both from the active and the inactive side giving cause to very different selfabsorption effects. The absorber was a single crystal of ferrous ammonium sulphate hexahydrate (FAS). Its absorption properties were taken over from a detailed study (Bull et al., Hyperfine Interact. 94(1–3), 1; Spiering et al. 2). FAS (space group P21/c) crystallizes as flat plates containing the (\(\overline {2}\)01) plane. The γ-direction was orthogonal to the crystal plate. The 57Co atoms of the 57Co/Rh source were assumed to be homogeneously distributed over a 6μ thick Rh foil and to follow a one dimensional diffusion profile in the 25 μ Fe-foil. The diffusion length was fitted to 10 μ. The theory follows the Blume-Kistner equations for forward scattering (Blume and Kistner, Phys. Rev. 171, 417, 3) by integrating over the source sampled up to 128 layers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink