Tracers- Nuclear Medicine please help?

is this information correct (concerning tracers in nuclear medicine)
- a radioactive substance is inject into shoulder [or body], or swallowed through mouth
- radioactive substances are generally gamma emitters
- We use a gamma camera to detect the tracer
- We use gamma rays for tracing as they can easily pass through the body without damaging it. Secondly [...]

Please Help! What is the difference between Nuclear Medicine Technology and Radiation Therapy Technology?

Please Help me!
I am thinking about majoring in one of these programs, but I don’t know which to choose??? I am confused!
What are the differences between the two?
What does a Radiation Therapist do and What does a Nuclear Medicine Technologist do?
What are their jobs?
Serious Answers please!
Thanks!

this is the end of my essay, will you proof read please?

On to college, being a radiologic technologist doesn’t require a huge amount of college. Knowing computers is an additional thing I found that was important in this line of employment, this is because working the x-ray machine includes working with circuit boards, processors, electronic equipment, computer hardware and computer software. This topic is something [...]

Nuclear Medicine please help?

what is the name of the detector in a gamma ray camera – the radioactive isotopes are detected by something but i cant remember its name