Calculate the Time Required for the Activity of a 9

question 58

Multiple Choice

Calculate the time required for the activity of a 9.0-mCi sodium-25 source to decay to 7.0-mCi (the half-life of sodium-25 is 60.0 s) .

• A) 22 s
• B) 44 s
• C) 0.029 s
• D) 19 s
• E) 9.4 s

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Definitions:

Korotkoff Sounds

The sounds that medical personnel listen for when they are taking blood pressure using a sphygmomanometer, which indicate the systolic and diastolic pressures.

Stethoscope

A medical instrument used by healthcare professionals to listen to internal body sounds, such as heart and lung sounds, for diagnostic purposes.

Blood Pressure Device

An instrument used to measure blood pressure, consisting typically of an inflatable cuff, a measuring unit, and sometimes a stethoscope.

Recalibrate

The process of re-adjusting, re-assessing, or altering a method, process, or machine to ensure accuracy and effectiveness.