Which risk significantly increases within a medical PET scanner undergoing prolonged use?

💡 Explanation

Crystal scintillator luminescence degrades due to radiation damage reducing photon yield; this is scintillation quenching. Quenching escalates when using isotopes for long runs. Therefore, crystal efficiency declines due to increased prolonged exposure, rather than primary source tungsten problems or failing support systems.

• Which problem arises because excessive multipath radio signal propagation degrades signal integrity in high-speed wireless communication systems?
• Which mechanism weakens molecular binding in heated polymers?
• Which mechanism limits the minimum size of a silicon-based MOSFET transistor?
• Which outcome occurs when a heavy nucleus undergoes induced fission?
• Which outcome increases when product is continuously removed from a reversible chemical reaction system at equilibrium?
• Which mechanical consequence develops when jet engine thrust equivalence is surpassed?