Continuous and grab radon measurement devices analyze what particles from the decay of radon?

The correct answer is alpha particles. When radon-222, a radioactive gas, decays, it emits alpha particles as one of its primary forms of radiation. Alpha particles are charged particles made up of two protons and two neutrons, and they have significant mass compared to beta particles and gamma rays.

In the context of radon measurement, devices that utilize alpha particle detection can accurately assess the level of radon in the air. Continuous radon measurement devices continuously sample the air, while grab samples provide discrete measurements. Both types of devices rely on detecting the alpha particles produced during radon decay, which allows for an effective assessment of radon concentration in a given environment.

Beta particles, gamma rays, and neutrons are also forms of radiation emitted during nuclear decay, but they are not the primary emissions from radon decay that measurement devices focus on. This makes alpha particles the correct choice for identifying the type of radiation specifically analyzed by radon measurement devices.