After Chemical Analysis, a Radioactive Sample Is Found to Contain

question 46

Multiple Choice

After chemical analysis, a radioactive sample is found to contain 2 g of uranium to every 5 g of thorium, its daughter isotope. If the half-life of uranium is 68.9 y, approximately how old is the sample?

• A) 70.0 y
• B) 83.7 y
• C) 111 y
• D) 165 y
• E) 125 y

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Definitions:

Principal Diagnosis

The primary condition diagnosed after study, which is chiefly responsible for a patient's hospital stay.

Chemotherapy

The use of chemical substances, especially drugs, to treat diseases, especially cancer by killing or stopping the growth of cancerous cells.

Breast Cancer

A malignant tumor that develops from breast cells, potentially affecting both men and women.

Neoplasm

An abnormal and uncontrolled growth of tissue, which can be benign or malignant (cancerous), affecting various parts of the body.