I need this for a review: What is the most popular or established method for preparation of samples for electron microscopy if a sample is hazardous for humans, e.g. when forming aerosols or is potentially infectious?
This might help
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=7840585
Probably not useful in your case, but a FIB is often used to prepare samples of radioactive materials for TEM. The activity of the resulting sample can be reduced by several orders of magnitude. A good paper describing the technique is "Implementation of FIB system in characterization of nuclear fuels and materials," by Aitkaliyeva, Miller and Cole (2014).
You may try to put such small particles onto TEM grids with holey carbon film. The small particles can be adhered on the amorphous carbon film.
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