When surveying for beta contamination, which of the following is true?

Beta particles exhibit moderate penetrating power, which means they can travel through certain materials but cannot penetrate deeply into denser substances like lead or concrete. They are primarily stopped by relatively thin materials such as plastic, glass, or even a few millimeters of aluminum. This characteristic of beta particles allows them to be detected effectively using thin window detectors, which are specifically designed to capture these particles without being obstructed by the detector's enclosure.

Thin window detectors are essential for beta contamination surveys because they allow beta particles to reach the sensitive detection area while minimizing interference from other types of radiation. This is crucial for accurately assessing contamination levels. In this context, the capability of these detectors to detect beta radiation while being sensitive to lower energy levels is why their use is emphasized in beta particle surveys.

Understanding the characteristics of beta radiation and the appropriate detection methods is vital for ensuring safety and effectiveness in radiological practices.