Before the Use of Technetium-99m, Patients with High Risk Coronary

question 6

Multiple Choice

Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a half-life of 73.00 hours. If a person is exposed to 5.000 μg of thallium-201, how many hours would it take to reach 10.00 % of its original mass?

• A) 3.322 hours
• B) 242.5 hours
• C) 21.98 hours

---

Definitions:

External Locus

of control is a belief that outcomes in one’s life are determined by external forces beyond personal control.

Catastrophic Stress

Severe stress resulting from exposure to a traumatic event or disaster that overwhelms an individual’s ability to cope.

Post-traumatic Stress Disorder (PTSD)

A mental health condition triggered by experiencing or witnessing a severely traumatic event, characterized by flashbacks, nightmares, severe anxiety, and uncontrollable thoughts about the event.

Survivor Guilt

A psychological phenomenon where individuals feel guilty for surviving a traumatic event when others did not.