The dead time of GM counter is?

10⁻⁶ seconds

10⁻³ seconds

10⁻⁴ seconds

10⁻¹ seconds

The dead time of a GM counter is the brief period (about 10⁻⁴ seconds) after detecting a particle during which it can't detect another.

This happens because the detector needs time to reset.

It limits how fast the counter can measure radiation.