Careful when using Molybdenum radiation sources

Just a quick heads-up. There’s a chance of 0.5% low-energy contamination when using molybdenum or silver radiation sources, even when using focusing devices, according to Macchi et al (doi:10.1107/S0021889811016232). While this is a low contamination level, it may have measurable effects in small-angle scattering of soft, low-absorption samples (simulations may follow soon).

One way of significantly reducing this contamination is by introducing a filter of (~100 micron) aluminium foil, so it should be easy to test whether it affects your experiments or not.

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