The application of rads is a complex technique, well planned and timed. It is not unusual to have two rads in a day, in my case it was timed around the availability of the machines on public holidays. The rads have to be 7 hours apart (I think it was 7, near enough).

Ask the docs about the ear pain, also does your Mother have any tinnitus? Report that to the docs too, as with any other new symptoms or changes.