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Chapter 1
| Question | Answer |
|---|---|
| What is radiation? | A form of energy |
| A radiation survey meter reads 10 mR/hr. How long will it take before a dose of 2 mrem is delivered? | 12 minutes |
| The radiation dose rate at a certain distance from a source is 2 R/hr. How long will it take before a dose of 100 mrem is recieved? | 3 minutes |
| Describe where naturally occurring background radiation comes from. | Cosmic radiation and natural radioactive materials on the earth. |
| What is one factor that will affect the amount of natural background radiation you will receive? | Geographic location. |
| What is the largest source of manmade radiation that an average person is exposed to? | Medical xrays. |
| Roughly hos much radiation dose does an average person recieve each year from natural background radiation? | 1000 mrems/year. |
| Roughly how much radiation dose does an average person receive from manmade sources of radiation each year? | 100 mrems/year. |
| Roughly how much radiation dose does a person working actively in gamma radiography receive at work each year? | 540 mrems/year |
| What are the two basic kinds of radiation? | Particle and electromagnetic |
| Comes from the nucleus of an atom that has too much energy | Gamma-rays |
| Produced by causing electrons to interact | x-rays |
| What are the three basic building blocks of an atom and what are their charges | Protons:positive, electrons:negative, neutrons: no charge |
| How are x-rays produced? | High speed electrons interact with other electrons and give off their energy as x-rays |
| Type of radiation that has energy and weight | Particles |
| Type of radiation that is pure energy | Electromagnetic |
| What happens when x-rays and gamma-rays collide with materials? | Electrons are torn free from atoms (ionization) and ions are created. |
| What is ionization? | The tearing off of electrons attached to atoms and the creation of ions. |
| What is the basic principle on which survey meters operate? | The measurement of current flow between twop electrically charged plates. |
| What is a Roentgen? a milliroentgen? | The unit of radiation exposure. 1/1000 of a Roentgen. |
| What is the unit of dose equivalent? What does this abbreviation stand for? | REM. Radiation Equivalent in Man |
| If a person recieves a dose of 120 mrems after 30 minutes in a radiation field, what was the dose rate of the radiation field? | 240 mR/hr. |
Created by:
soquain