The threshold energy below which pair production cannot occur is approximately:

Related MCQs

• The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 cm or 1 foot) is attenuated in air to approximately 5mR/h at a distance of approximately:
• Approximately what energy X ray machine would be required to have penetrating power equivalent to a Cobalt-60 source:
• The average energy of a Cs-137 source is approximately:
• The average energy of a T3-170 source is approximately:
• The average energy of a Ir-192 source is approximately:
• Which of the following circuits converts electrical energy to ultrasonic energy?
• The primary form of energy conversion when an X ray tube is energized results in the production of:
• Addition of approximately 6% antimony as an alloying element could be expected to increase the ultrasonic inspectability of which of the following materials?
• When a mercury vapour black light is inadvertently cut off, approximately how long should it be allowed to cool before attempting to restart?
• One half value layer of lead for Iridium-192 is approximately: