Examlex
Which of the following is placed perpendicular to the long axis of the grid for a lateral projection of the abdomen?
Half-Life
The time required for half the atoms of a radioactive substance to decay or for a drug or other substance to lose half its pharmacologic, physiologic, or radiologic activity.
Potassium-40
A radioactive isotope of potassium used in dating geological materials, as it decays into argon-40 over a known period of time.
Carbon-14
A radioactive isotope of carbon used in dating organic materials and archaeological objects through radiocarbon dating methods.
Carbon-12
A stable isotope of carbon with six protons and six neutrons, used as a standard in atomic mass units.
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