Spark Detector

Description

SP4-2032
A new and improved spark detector gives a memorable and
dramatic demonstration of the ionising properties of alpha
particles.
Alpha particles have short range but are very effective at ionizing
air. In this apparatus a number of fine wires are supported above
a metal plate to form two electrodes separated by a small air gap.
4mm terminals allow an EHT supply to be connected and when
the potential across the gap reaches about 4500V occasional
ionised particles cause a visible and audible spark to occur. If an
alpha source is brought near, the sparking dramatically increases
showing the presence of ionised particles. The short range
and poor penetrating properties of alpha radiation can be easily
demonstrated.
SP4-2032