Which of the following are sources of low-level radiation exposure?
1. X-rays and radioactive materials used for diagnostic purposes.
2. Employment-related exposure in medicine and industry.
3. Natural background radiation.
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
d. 1, 2, and 3
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Fill in the blank(s) with the appropriate word(s).
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