Author/Authors :
Giblin، نويسنده , , S.P. and Bakshandier، نويسنده , , E. and Fletcher، نويسنده , , N.E. and Lines، نويسنده , , K.J. and Sephton، نويسنده , , J.P.، نويسنده ,
Abstract :
A measurement system for ionisation chamber currents below 1 nA is presented. The system is based on a standard capacitor charging technique, and uses a commercially available electrometer and air-gap capacitor. We find that the uncertainties in the current range 100 fA–1 nA are up to an order of magnitude better than those available from a state-of-the-art commercial electrometer alone.
Keywords :
Radioactivity measurement , Ionisation chamber , Small current traceability , Electrometer
