What type of monitor detects ions created by radiation from radon decay?

The type of monitor that detects ions created by radiation from radon decay is a pulsed ion chamber. This device works by utilizing an electric field to detect charged particles (ions) that are produced when radiation interacts with the chamber's gas. When radon decays, it emits alpha particles, which are then detected as they ionize the gas within the chamber. The pulsing mechanism allows the device to accurately measure the rate of ionization over a specific period, providing a reliable assessment of radon levels in the environment.

Other options referenced in the question employ different detection mechanisms. Scintillation cells, for instance, detect radiation through the emission of light when particles interact with certain materials, while alpha track detectors work by capturing alpha particles on a special surface that leaves tracks indicating their passage. Liquid scintillation devices are used primarily for detecting beta and gamma radiation through a similar light-emission method as scintillation cells. Each of these methods serves specific purposes in radiation measurement but does not utilize the ionization detection mechanism specific to pulsed ion chambers.