spark counter

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Noun1.spark counter - an instrument that detects ionizing radiation from elementary particles
particle detector - a chamber in which particles can be made visible
References in periodicals archive ?
Unilateral' announcements like those made by Trump tend to spark counter measures, said Azevedo.
The two Lukes, Hughes and Childs, were helped out in their defensive duties by Josh Smith, and alongside Renton, Josef Edwards and Marcellus Kerr tried to spark counter attacks.
It was very different from Boro's more patient, probing passing that made his own interventions and touches to change direction and spark counters more likely to count.