This run was taken with a
modern charcoal sample mixed with Ni powder (1:1 by vol) loaded into a
cathode. The 12C negative ion current was about 1 mic A leading to a 14C
3+ count rate of ~3 cps at a terminal voltage of 2.2 MV. The data were
taken using a Si surface barrier detector mounted in a chamber on the
zero deg line of the MUDRA facility. (Reported
in AMS-8, Vienna, Sep 6-10, 1999).