What is the typical activity/quantity of Cesium 137 in a new gauge?

The typical activity or quantity of Cesium-137 in a new nuclear gauge is often around 8-10 millicuries. This specific range is widely adopted because it provides a balance between sufficient radiation levels for the gauge's intended measurements and adherence to safety regulations. Cesium-137 is commonly used in nuclear gauges due to its half-life and energy, which make it suitable for various applications, including density and moisture measurement.

Operating within this range allows for effective functionality of the gauge while keeping radiation exposure to operators and the environment at manageable levels. This standardization helps ensure consistency in performance across different gauges, which is crucial for reliable measurements in various industrial and construction contexts. The established activity levels also facilitate compliance with regulatory limits, ensuring safety for users and minimizing potential health risks associated with radiation exposure.