Strontium 90, a Radioactive Isotope of Strontium, Is Present in the Fallout

question 126

Multiple Choice

Strontium 90, a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans, because, upon ingestion of contaminated food, it is absorbed into the bone structure. Its half-life is 27 years. If the amount of strontium 90 in a certain area is found to be eight times the "safe" level, find how much time must elapse before an "acceptable level" is reached. ​

• A) 81 year(s) must elapse before an "acceptable level" is reached.
• B) 78 year(s) must elapse before an "acceptable level" is reached.
• C) 66 year(s) must elapse before an "acceptable level" is reached.
• D) 57.3 year(s) must elapse before an "acceptable level" is reached.

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Definitions:

Drawings

Visual representations made on a surface, usually paper, using pens, pencils, or other marking tools, often as a means of expression or communication.

Handedness

The preference for using one hand over the other for performing tasks; usually categorized as right-handed, left-handed, or ambidextrous.

Genetically

Pertaining to genes or heredity, involving the transmission of traits from parent to offspring through DNA.

Environmentally Determined

The concept that certain traits or behaviors are shaped primarily by environmental factors rather than genetic ones.