The Linear Attenuation Coefficient in Lead for ^99mTc Gamma Rays

question 10

Multiple Choice

The linear attenuation coefficient in lead for ^99mTc gamma rays (140 keV) is 23 cm^-1. What percentage of these gamma rays will be absorbed by a lead apron that contains 0.60 mm of lead?

• A) 75%
• B) 50%
• C) 25%
• D) 12.5%

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Definitions:

Anomers

Carbohydrates that differ in configuration only at the hemiacetal or hemiketal carbon atom, often referred to as the anomeric carbon.

Optical Rotation

The measurement of the degree to which a chiral compound rotates plane-polarized light, a property specific to chiral substances.

α-D-Glucopyranose

A cyclic form of glucose where the ring consists of five carbon atoms and one oxygen atom, with the glucose in its alpha configuration.

Haworth

A representation method in chemistry used to depict the cyclic structure of monosaccharides with a simple three-dimensional perspective.