Exposure to Radioactive Material Is Considered Safe After 10 Half-Lives

question 9

Multiple Choice

Exposure to radioactive material is considered safe after 10 half-lives because

• A)less than a tenth of 1% of the material remains.
• B)less than 12.5% of the material remains.
• C)ten is an even number.
• D)all of the material will have decayed at that time.

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Definitions:

Sexual

Relating to or associated with sex, sexual activity, or sexual reproduction.

Unconscious

The part of the mind that contains thoughts, memories, and desires not within immediate awareness but influencing behavior.

Day-to-Day Functioning

The ability to perform everyday activities and routines, including work, social interactions, and self-care tasks.

Correlational Method

A research technique used to study the relationship between two or more variables without attempting to influence or control them.