Final answer:
To extend the life of an x-ray tube, warming up the anode each morning and using the lowest mA setting possible are effective practices, while using a 'low-speed rotor' is not typically associated with x-ray tube longevity.
Step-by-step explanation:
To prolong the life of an x-ray tube, certain practices are recommended:
Warming up the anode each morning helps to evenly distribute the thermal load, which reduces the risk of damage from sudden heating when the x-ray tube is used.
Using the lowest milliampere (mA) setting possible helps to reduce the heat generated within the x-ray tube, which in turn decreases the rate of wear on the tube components.
While the question mentions using a 'low-speed rotor', that's not typically associated with x-ray tube life extension. Instead, proper maintenance and following the usage guidelines, such as avoiding abrupt changes in high voltage, can effectively extend tube life.
In summary, steps such as proper warming up of the anode and using the lowest possible mA settings contribute to the longevity of an x-ray tube.