For X-ray tubes that have been in storage or inactive for a period of three months or more.
After a period of not being used, typically three months or more, residual gasses are released from the internal surfaces of the X-ray tube and accumulate into the tube vacuum. If the maximum rated voltage (in kV) is applied after a period of storage without performing a conditioning procedure, permanent damage to the X-ray tube may occur due to the destructive nature of high voltage arcs in the ionized gas. The following conditioning procedure is appropriate for both “new tubes”, as there may have been a period of storage, as well as tubes that have been stored for three months or more.
To prevent this damage the following special conditioning process should be followed:
If instability (especially loud popping) is observed, lower the kV setting to the previous step. Allow mA to stabilize for at least 5 minutes before increasing settings again.