"In order to" is best. I don't think the "while dealing with..." phrase adds anything to the sentence.
I am not sure that this should be left to the operators. The workplace should be organized to minimize their exposure. It should have nothing to do with the practices of Bob versus how Joe runs the machine.
Every time I have gotten an x ray, the technicians go into another room in order to run the machine. The controls are in a safe area.
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