Radiotherapy used in the treatment of cancer usually use gamma-rays from:
Correct answer: B. Cobalt-60
- A. Copper-60
- B. Cobalt-60
- C. Gold
- D. Silver
Explanation
Cobalt-60 emits two high energy gamma rays, making cobalt-60 both an internal and external hazard. The primary exposure pathways of concern are ingestion (drinking water and fish consumption), and exposure by inhalation and external exposure.
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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