What must a chain of custody include when handling radon measurement devices?

• A. Times, locations, and personnel involved
• B. Devices, transport, and documentation
• C. Conditions, locations of devices, and transport of devices
• D. Only times and locations

Answer: (C)

A chain of custody for radon measurement devices is critical in maintaining the integrity and reliability of the data collected during measurements. The correct approach involves documenting conditions, such as temperature, humidity, or any disturbances that may affect the radon levels, as well as the specific locations where the devices are placed. This documentation helps ensure that the conditions under which the measurements are taken are consistent and can be replicated or reviewed if necessary.

Additionally, noting the transport of devices is essential since the devices may not only need to be correctly calibrated but also protected from environmental influences during transit. Each of these aspects plays a crucial role in establishing a clear and reliable chain of custody, ensuring that the collected data is valid and can be trusted for evaluation or regulatory purposes.

In contrast, while documenting times and locations, transport details, or merely device information is also important, these alone do not provide the comprehensive context required. Collectively, understanding conditions alongside locations and transport ensures a complete picture of the chain of custody and is essential for upholding the standards of radon measurement practices.