What is the half-life of radon-222?

Radon-222 has a half-life of approximately 3.8 days, which means that after this period, half of a given quantity of radon-222 will have decayed into other elements. Understanding the half-life of radon-222 is essential for radon measurement and mitigation practices because it affects how long radon remains a concern in the environment, particularly in residential settings where it can accumulate.

The knowledge of this specific half-life is crucial for technicians as it informs how often measurements should be taken and how long mitigation systems should remain in operation to ensure that radon levels are monitored effectively. Knowing that radon-222 has a relatively short half-life helps in designing appropriate monitoring strategies, especially for short-term testing intervals, as it allows for a clearer understanding of how radon concentrations fluctuate over time due to its decay process.

The values associated with the incorrect options do not reflect the established half-life of radon-222, which is scientifically recognized and documented. Therefore, 3.8 days is the accurate figure that technicians need to remember when working with this radioactive gas.