If the voltage of the electret in an electret ion chamber is less than 200 volts before testing, what must be done?

In the context of using an electret ion chamber for radon measurement, the voltage of the electret is crucial for its proper functioning. Electrets operate based on a maintained electric field, and if the voltage is below a specific threshold, such as 200 volts, it indicates that the electret is not capable of generating the required electric field for accurate measurements.

When the voltage falls below this level, it can result in unreliable readings, which means that accurate radon levels cannot be determined. Therefore, to ensure the accuracy and reliability of radon measurements, the electret must be replaced if the voltage is below the specified threshold. This is necessary because simply recharging or recalibrating a low-voltage electret may not restore its functionality or ensure the necessary performance for testing. Replacing it guarantees that a fully operational electret is used in the measurement process.