X-ray emission from a miniature vacuum spark gap, operating at 25 kA,
40 kV, has been studied experimentally. Spark gaps with conical, flat
and hemispherical shaped electrodes made up of stainless steel, copper
, brass and aluminium have been investigated. The X-ray emission was o
bserved to be emitted from region close to anode and lasted for a few
tens of ns. The average energy (approximate to 9-12 keV) and intensity
(approximate to 30-70 mR) of the X-ray emitted went up with the incre
ase of atomic number of electrodes.