To ensure accurate use of RDP measurement devices, what should be avoided?

To ensure accurate use of RDP (radon decay products) measurement devices, deploying devices in humid conditions should be avoided. High humidity can impact the performance and accuracy of the measurement devices. Moisture in the air can lead to the formation of water droplets that may interfere with the detection and collection of radon decay products, potentially skewing the results. Therefore, maintaining a controlled environment with low humidity is essential for reliable readings.

In contrast, keeping devices filter-free of non-RDP particles is relevant to ensuring accurate measurements, as a clean filter ensures that only the radon decay products are detected. Using too many devices does not directly relate to the accuracy of the individual measurements, and testing in closed environments is typically necessary to get a proper reading of radon levels. Thus, the correct focus in ensuring accuracy lies in maintaining low humidity during measurements.