Which statement about the shielding method of performing a dose calibrator linearity test is true?

Using shields in a dose calibrator linearity test is a method that requires initial confirmation of the shields' accuracy. When shields are introduced, they can affect the readings of the radioactivity being measured by the dose calibrator. To ensure that the measurements reflect the true activity, it's essential to conduct a decay method assessment when first using the shields. This involves measuring the radioactivity of a known source and monitoring its decay over time, confirming that the readings are accurate and consistent.

By establishing the calibration accuracy with the decay method, the integrity of the shielding can be validated, ensuring that the subsequent linearity tests yield reliable results. This initial confirmation step is crucial because the presence of shields can alter gamma ray interactions and, thus, the detected activity, which may lead to erroneous interpretations if not accounted for.

The other choices do not accurately describe the essential aspect of the shielding method’s requirements or implementation. The importance of the decay method when starting with shields specifically highlights the commitment to accurate measurement standards in nuclear medicine practices.