During geometric variation testing of a dose calibrator, if the activity in a 1 mL syringe measures 253 uCi and the expected reading is 212 uCi, which correction factor should be applied?

To determine the appropriate correction factor during geometric variation testing of a dose calibrator, it is essential to compare the measured activity to the expected activity. In this scenario, the measured activity is 253 µCi, while the expected activity is 212 µCi.

To find the correction factor, you divide the expected reading by the measured reading:

Correction Factor = Expected Activity / Measured Activity

In this case:

Correction Factor = 212 µCi / 253 µCi ≈ 0.8387

This value rounds to approximately 0.84, which aligns with the correction factor identified in the answer choice.

Applying this correction factor can help ensure that the dose calibrator provides accurate measurements by adjusting for geometric variations that may influence readings. In nuclear medicine practice, it is critical to account for such variations to maintain accuracy in dosimetry and dosing. Thus, applying a correction factor of 0.84 is the correct approach to adjust the measurements appropriately.