"What's the difference between a radiographer and a radiologist?" About �50,000 per year!
There are two types of radiographer. A diagnostic radiographer is the person who takes and interprets X-rays and other medical scans. A therapeutic radiographer uses radioactive sources to treat conditions such as cancer.
Radiographers work alongside, and under the control of radiologists. These are full-qualified doctors who have chosen radiology as their specialism in the same way that other doctors might choose to specialise in surgery.
There's more about radiography here:
http://www.learndirect-advice.co.uk/helpwithyo urcareer/jobprofiles/profiles/profile444/
If you compare the qualifications and training of radiographers with those of doctors (including radiologists), you'll see just how great the divide is:
http://www.learndirect-advice.co.uk/helpwithyo urcareer/jobprofiles/profiles/profile691/
Chris