1. The radioactive decay series that produces Rn-222 begins with

2. The U-238 decay series ends with the stable _____________isotope.

3. Radon is measured in units of _____________.

4. Radon Progeny are measured in units of _______________.

5. The assumed ER in the indoor environment is ________________.

6. List three types of ionizing radiation.

7. List the characteristics of radon.

8. The number of _________defines the element.

9. What happens every time a radium atom breaks down?

10. These particles are the most massive type of radiation.

11. What radiation is pure energy?

12. Which type of radiation is the most harmful?

13. What are the three naturally occurring isotopes of radon?

14. The half-life of Rn222 is ______________.

15. Radon has ______ protons.

16. Define isotope.

17. What happens in radioactive decay?

18. What is half-life?

19. These particles are more penetrating than alpha particles.

20. What is the radon action level in the state of Illinois?

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