11.   Gamma radiation has the greatest penetrating power of the three types of radiation.

12.   In irradiation, food is placed in large aluminum containers and exposed to gamma radiation as the food moves through a chamber on a conveyor belt.

13.   Much like a microwave, irradiation sends a beam of energy through food, in this case using gamma radiation to kill microorganisms without heat.

14.   Much like a microwave, gamma radiation sends a beam of energy through food.

15.   Once in place, it will be possible to detect rises in the level of background gamma radiation.

16.   One possibility that had been suggested was a collision of neutron stars, remnants of exploded stars, that annihilate each other in a puff of gamma radiation.

17.   Researchers are still determining whether to use gamma radiation, which is used to kill cancer cells, or beta radiation, which is used by opthamologists.

18.   The amount of water stored in the snow can be calculated after determining the reduction in gamma radiation since the autumn flights.

19.   The gamma radiation may come from sprites and blue jets, although direct proof is lacking.

20.   The visible signal is presumably light from the cooling fireball from the catastrophic event that triggered the gamma radiation.