Radiation Users Quiz

This quiz is only for those who are using unsealed radioisotopes at the University of Colorado (Boulder, Denver, or Colorado Springs campuses) and who have already completed the Basic Radiation Safety Orientation. Please fill out this quiz completely and then submit the form to Health Physics to fulfill your refresher training requirement. Most answers will be found in the Radiation Safety Handbook, although some are simply common-sense. If you have any questions, send e-mail to HPL.

If you have difficulty submitting the quiz, you may print it out, complete it, and then return it to the Radiation Safety Office at 413 UCB or FAX it to (303) 492-1322 for grading.

Please enter your information here:

Name (first - MI - last):

What lab are you in?

Principal Investigator: Building/Room:

What's your e-mail address?

Please check the best answer for each question.

1. Health Physics personnel are available to assist with questions and emergency response involving radioactive materials. During normal business hours, what number would you call to contact Health Physics?

2. Which radiation is least penetrating of human skin tissue?

3. Which type of external radiation would be considered the most hazardous, given an equal amount of activity and distance from the source?

4. The Total Effective Dose Limit, set by the Nuclear Regulatory Commission (NRC), is an amount of radiation which may be received by a radiation worker.

5. Surveys taken by laboratories using unsealed radioactive materials are required to be taken:

6. When the distance between a worker and a radioactive source is increased, the amount of radiation received will

7. If a radiation worker becomes pregnant, she is encouraged to voluntarily

8. Which type of shielding will reduce the hazard of Bremsstrahlung x-rays which are created by high-energy beta-emitters, such as 32P?

9. Loose contamination in the laboratory must be controlled so that

10. During a routine contamination survey of laboratory, Health Physics personel find a lab bench contaminated at the level of 1,200 dpm/100 cm2 of 32P. The area MUST be decontaminated and resurveyed.

11. Contamination surveys must be performed by laboratory personnel at the following intervals

12. Radioactive materials may only be ordered using a Purchase Request (PR)/Standing Purchase Order (SPO).

13. It is acceptable to use biohazard bags to hold radioactive waste.

14. The annual occupational dose (whole body) limit to radiation workers, set by the NRC, is

15. Decontamination of laboratory surfaces is best achieved by

16. Before using a portable radiation survey instrument (such as a geiger counter) you should

17. Dosimeters should be worn

18. The reading on a geiger counter is always constant, regardless of the type of radiation monitored, the distance between the instrument probe and the source, and the orientation of the probe with relation to the surface monitored.

19. The main duty of a principal investigator (P.I.) licensed by the Radiation Safety Committee is to

20. No eating, drinking, or applying of cosmetics is allowed in a laboratory using radiation, except in designated areas and after washing one's hands.

21. The primary use of a dosimeter is to

22. The principal delayed effect of radiation exposure is the potential of developing cancer.

23. The risk of radiation induced cancer from occupational exposure is much greater than the risks associated with other events or activities we encounter and accept in our normal day-to-day life.

24. Disposable equipment such as petri dishes, rubber gloves and razor blades used in experiments which mix radioactive materials with biologically hazardous materials should be disposed of by

25. It is a good idea to periodically dispose of old isotope vials, especially those containing tritium, in order to reduce the risks from exposure and contamination.


If you have worked with radiation at any institution other than the University of Colorado during the past three years, it is your responsibility to notify Health Physics so that your lifetime dose can be tracked. Please answer the questions below before submitting your refresher quiz.

I have not worked with radiation at an institution other than CU in the past 3 years. (If you checked this box, thanks for your time -- please go ahead and submit your quiz).

I have worked at the following institution(s) other than CU in the past 3 years. (separate information by commas).

Name/Address of Institution(s):

Radiation Safety Contact(s):

Type(s) of radiation used:

Thanks for your time!