The Biological Half-Life of ¹³¹I in a Particular Patient Is

question 19

Multiple Choice

The biological half-life of ¹³¹I in a particular patient is 30 days.The physical half-life is 193 hours.If the patient's thyroid is counted with the thyroid probe detector, what effective half-life will be observed?

• A)26 days
• B)6.3 days
• C)5.1 days
• D)1.2 days

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Definitions:

Retinal Disparity

The slight difference in the visual images that reach each eye, which is crucial for depth perception.

Depth Perception

Depth Perception is the visual ability to perceive the world in three dimensions and to judge the distance of objects accurately.

Continuity

The continuous and steady presence or functioning of something throughout a duration of time.

Perceptual Constancy

Perceiving objects as unchanging (having consistent color, brightness, shape, and size) even as illumination and retinal images change.