3 grams per year calibrated source

hi im looking for a calibrated source 3 grams per year to check my leak detector with it have seen a picture in the past that looked like a bottle adaptor that was supposedly a calibrated 3 gram per year leak source
does anyone have an idea where i can get one from
thanks in anticipation Nick

We can buy those at our regular supplier, mostly from Inficon.

Refco also makes these (5g/yr).
Part No 4492022

thanks guys do you know of a uk supplier

try CPC

http://www.cpcuk.co.uk/index.htm