Dear Bettina (and for the benefit of anyone else interested),

The NaF pellets may be obtained from Fluorogas Ltd.
As stated earlier, the company may be contactedby e-mail at::
[log in to unmask]
There is also a website: www.fluorogas.co.uk

Regards,
Martin

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Martin F Miller,
Planetary Sciences Research Institute,
The Open University,
Walton Hall,
Milton Keynes MK7 6AA
UK

Tel (direct line): +44 1908 652011
Fax (departmental): + 44 1908 655910
E-mail: [log in to unmask]