Radiation Biology Chapter 1

radiation

The transfer of kinetic energy, or energy of motion, from one location to another

1895

What year was x-rays discovered?

Wilhem Roentgen

Who discovered x-rays?

ionizing radiation

is radiation that produces and negatively charged particles (ions) when passing through

ions

charged particles

1. creation of unstable atoms

2. production of free electrons

3. production of low-energy x-ray photons

4. creation of highly reactive free molecules (called free radicals) capable of producing substances poisonous to the cell

5. Creation of new biologic molecules detrimental to the living cell

6. Injury to the cell that may manifest itself as abnormal function or loss of

   function

what are the consequences of ionizing human cells?

• Invisible

• Varying degree of penetration

• Cannot be detected

• Cannot be focused with a lens

• Travel in straight lines at the speed of light (300 million m/sec)

• produced charged particles

• Will darken photographic film (photoluminescence)

• Wide range of energies

Properties of x-rays:

1. scope

2. patient

Team approach:

• Team members are working within their ______ to work on a common goal which is the _______

Radiant energy

form of energy that travels through space specifically in the form of electromagnetic waves.

1. Distance yourself

2. Wear shield

3. Communication

How do you protect yourself from radiant energy?

Protect persons from:

1. Short-term effects of radiation (mins, days, weeks)

2. Long-term effects of radiation (months, years)

2 goals of radiation protection: