What Is the Time Needed for the Activity of a Radium-226

question 69

Multiple Choice

What is the time needed for the activity of a radium-226 source to change from 1.5 Ci to 0.50 Ci? (The half-life of radium-226 is 1.60 * 10³ y.)

• A) 5.33 * 10² y
• B) 1.60 * 10³ y
• C) 1.10 * 10³ y
• D) 9.36 * 10² y
• E) 2.54 * 10³ y

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Definitions:

Pinochet

Augusto Pinochet, a Chilean general who led a coup d'état in 1973 and served as dictator of Chile until 1990, known for human rights abuses.

Archibald Cox

An American lawyer and law professor who served as the United States Solicitor General under President Kennedy and as the special prosecutor during the Watergate Scandal.

Richard Nixon

The 37th President of the United States, serving from 1969 until 1974, who is best known for his involvement in the Watergate scandal which led to his resignation.

Watergate Investigation

A major political scandal in the United States involving the administration of President Richard Nixon, following a break-in at the Democratic National Committee headquarters and subsequent efforts to cover it up.