What is the best method for determining the position of a radiography source?

The best method for determining the position of a radiography source is performing a survey. This process typically involves using a radiation detection device to measure the radiation levels around the area where the radiography source is located. By conducting a survey, personnel can accurately identify the source's location and assess any potential exposure to radiation, ensuring safety protocols are followed.

Visual inspection may not provide reliable information since radiation sources are often not visible to the naked eye. Counting the number of cranks needed to expose and retract the source may be helpful in some contexts, but it does not provide a definitive location or safety assessment of the source's actual position. Leak testing is primarily concerned with identifying any leakage of radioactive material from the source, rather than pinning down its precise location. Therefore, performing a survey is the most effective and safest method for determining the position of a radiography source.