Yes it's hard to find a job as a radiation therapist.
There are still jobs out there for radiation therapists but most if not all of those jobs are currently filled until some of the radiation therapists retire.
If you have a job as a radiation therapist it can be hard to move to another location because it can be difficult to find new employment elsewhere as a radiation therapist.
The radiation therapist job will always be in demand but there can be times where it's difficult to find a job as one.
I do see some listings in my area for hiring a radiation therapist so there is some jobs out there for them.
But it depends on your location as to whether or not you can find a job there.
If you want to become a radiation therapist then you may have to relocate to another state or town to find a job as a radiation therapist.