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

question 33

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%

---

Definitions:

Depressive Symptoms

Manifestations of depression, such as persistent sadness, lack of interest in activities, and changes in appetite or sleep patterns.

Bodily

Pertaining to or concerning the physical body.

Bipolar Disorder

A mental health condition characterized by extreme mood swings that include emotional highs (mania or hypomania) and lows (depression).

Major Depression

A mental health disorder characterized by persistently depressed mood or loss of interest in activities, causing significant impairment in daily life.