Berlin 2015 – scientific programme

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KR: Fachgruppe Kristallographie

KR 2: Poster Crystallography

KR 2.6: Poster

Monday, March 16, 2015, 19:00–21:00, Poster C

Impact of temperature and barometric pressure fluctuations on X-ray beam intensities — •Tina Weigel¹, Matthias Zschornak¹, Marco Herrmann², Manuel Rothenberger¹, Tilmann Leisegang², and Dirk C. Meyer¹ — ¹Institut für Experimentelle Physik, Technische Universität Bergakademie Freiberg, Leipziger Str. 23, 09596 Freiberg, Germany — ²Saxray GmbH, Maria-Reiche-Str. 1, 01109 Dresden, Germany

Essential to X-ray analysis in crystallography, such as diffractometry and spectrometry, is a stable and reproducible X-ray beam intensity. Particularly, changes in environmental conditions, such as temperature, humidity and barometric pressure, and cooling water fluctuations can affect the beam intensity significantly. In this comprehensive qualitative as well as quantitative study, the impact of the environmental conditions and cooling water fluctuations on the primary beam intensity of a sealed tube with Cu anode are determined. This should be of wide interest for all who are dealing with X-ray analyzes, in particular in the field of crystallography, where accurate experimental data are a prerequisite for deriving high-quality structure parameters. With a common set-up, the X-ray intensities are detected by a scintillation counter. Laboratory as well as external conditions are monitored simultaneously. Their individual influence on the X-ray intensity and their correlations are evaluated by statistical analysis including time lag. The study shows significant correlations in respect to ambient conditions and in particular with daily and weekly cycles, which affect the intensity nearly instantaneous.