None can less afford to delay than the aged sinner. Now is the time. Now or never. You have, as it were, one foot already in the grave. Your opportunities will soon be over. Strive, then, I entreat you, to enter in at the strait gate.
The growth of technology is such that it is not possible today for a nuclear physicist to switch into medical physics without training. The field is now much more technical. More training is needed to do the job.

