The two basic kinds of radon testing devices are which?

The two basic kinds of radon testing devices are which?

• A. Short-term and Long-term
• B. Digital and Analog
• C. Passive and Active
• D. Portable and Fixed

Answer: (C)

Radon testing devices come in two basic kinds: passive and active. Passive devices don’t require power; they simply collect radon over the exposure period and are later analyzed, typically by a lab. Examples include charcoal canisters and alpha-track detectors. Active devices use power and continuously sample air to measure radon, often providing ongoing or near real-time readings; these are usually continuous radon monitors. The distinction matters because passive tests are simple and cost-effective for long-term integrated results, while active monitors offer quicker, ongoing measurements and more immediate data. The other options describe duration, display, or physical form rather than the fundamental measurement approach, so they aren’t the core categories.

Radon testing devices come in two basic kinds: passive and active. Passive devices don’t require power; they simply collect radon over the exposure period and are later analyzed, typically by a lab. Examples include charcoal canisters and alpha-track detectors. Active devices use power and continuously sample air to measure radon, often providing ongoing or near real-time readings; these are usually continuous radon monitors. The distinction matters because passive tests are simple and cost-effective for long-term integrated results, while active monitors offer quicker, ongoing measurements and more immediate data. The other options describe duration, display, or physical form rather than the fundamental measurement approach, so they aren’t the core categories.