Please enter your information here:

Name (first, MI, last):

What lab are you in? (please enter the name of the PI who is licensed for the source(s) you are planning to use)

Principal Investigator:

Building/Room:

If you are taking this quiz because you will be using sealed sources as part of a class, please list the course number here (ex: PHYS 2150):

What's your e-mail address?

Please check the best answer for each question.

1. A major difference between working with sealed sources and working with loose isotope is:

a) Sealed source workers don't have to worry about Time, Distance, and Shielding rules

b) Sealed sources are not as dangerous

c) Sealed sources can be handled without concern for contamination of skin and clothes

d) Sealed source workers don't need to have a geiger counter available

2. Which of the following is NOT a type of sealed source:

a) Plated sources

b) Capsules

c) Activated Metals

d) Lead pigs

3. A good way to keep your dose ALARA is to:

a) Decrease the time spent near the source

b) Increase the distance from the source according to the inverse square law

c) Use appropriate amounts and types of shielding between you and the source

d) All of the above

4. For a sealed source which emits beta particles, the following shielding should be used:

a) One centimeter thick plexiglass

b) Thin lead foil or a moderately thick lead sheet

c) Two lead bricks and a sheet of steel

d) The shielding depends on the nature of the sealed source

5. The dosimeter should be worn:

a) Between the neck and the waist

b) On the sleeve

c) Anywhere on the body

d) It should be kept in the cabinet with the sources

6. True or false: In every laboratory using radioactive sources, there should be clearly displayed a list of people, including their phone numbers, who are to be called in case of a NON life-threatening emergency.

True

False

7. As a researcher, you want to move a Tier I source from one building on campus to another building. What arrangements must you make?

a) Obtain written permission from the licensee to allow transport

b) Contact Health Physics and arrange for them to transport the source

c) Complete the sign-out sheet for the source, noting the new location

d) All of the above

8. How long is the allowed Use Period for a Tier II sealed source?

a) 10 days

b) 3 months

c) 2 weeks

d) 3 years

9. What level of leakage from a source will cause a source to HAVE to be removed from use?

a) 0.0001 microcuries per leak test

b) 0.005 microcuries per leak test

c) 0.003 microcuries per leak test

d) 15 picocuries per leak test

10. True or false: Individuals working with Tier I sealed sources require both a film badge dosimeter and frequent bioassays.

True

False

11. The approximate rate of exposure from a sealed source emitting gamma radiation:

a) is the same at all distances

b) increases proportionately to the distance

c) decreases inversely as the distance

d) decreases inversely as the distance squared

e) shows no systematic relationship with the distance

12. True or false: There is no chance of any external exposure from a Tier II source

True

False

13. True or false: An individual sealed source may emit more than one type of radiation.

True

False

14. True or false: All sealed sources, Tier I and Tier II, must be signed out when they are removed from storage for use.

True

False

15. Exposure is measured in units of:

a) mRem

b) Curies

c) alphas

d) ALARA

e) Tiers

16. A leak test of a sealed source involves:

a) submerging the source in a liquid scintillator.

b) a wipe smear on the source.

c) drilling a small hole in it.

d) estimating the number of hours it has been in use.

e) all of the above.

17. Sealed sources can emit all but one of the following types of radiation. Which is the one that cannot be emitted?

a) alpha particles

b) beta particles

c) gamma rays

d) protons

e) neutrons

18. At CU, radiation survey meters are tested and recalibrated:

a) every six months

b) annually

c) every two years

d) never

19. All personnel using radiation-producing machines and/or radioactive materials at CU must complete refresher training:

a) every year

b) every three years

c) every five years

d) only in the case of an exposure

e) never

20. True or False: The safe use of radioactive materials is best accomplished when the end user and radiation safety personnel act in cooperation

True

False

IMPORTANT!

If you have worked with radiation at any institution other than the University of Colorado (Boulder, Denver, or Colorado Springs campuses only) since beginning your work here, it is your responsibility to notify Health Physics so that your lifetime dose can be tracked. Please answer the questions below before submitting your quiz.