Context and question: 64Zn, the most abundant isotope of zinc, is very susceptible to neutron activation, being transmuted into the highly radioactive 65Zn, which has a half-life of 244 days and produces intense gamma radiation. Because of this, Zinc Oxide used in nuclear reactors as an anti-corrosion agent is depleted of 64Zn before use, this is called depleted zinc oxide. For the same reason, zinc has been proposed as a salting material for nuclear weapons (cobalt is another, better-known salting material). A jacket of isotopically enriched 64Zn would be irradiated by the intense high-energy neutron flux from an exploding thermonuclear weapon, forming a large amount of 65Zn significantly increasing the radioactivity of the weapon's fallout. Such a weapon is not known to have ever been built, tested, or used. 65Zn is also used as a tracer to study how alloys that contain zinc wear out, or the path and the role of zinc in organisms.
Why is zinc oxide used in atomic reactors?
Answer: unanswerable
Context and question: Typical use of the various technologies described above include calling or conferencing on a one-on-one, one-to-many or many-to-many basis for personal, business, educational, deaf Video Relay Service and tele-medical, diagnostic and rehabilitative use or services. New services utilizing videocalling and videoconferencing, such as teachers and psychologists conducting online sessions, personal videocalls to inmates incarcerated in penitentiaries, and videoconferencing to resolve airline engineering issues at maintenance facilities, are being created or evolving on an ongoing basis.
What is one way businesses can conduct online sessions?
Answer: unanswerable
Context and question: In the 51 years prior to the Empire Stadium opening, the final (including 8 replays) was held in a variety of locations, predominantly in London, and mainly at the Kennington Oval and then Crystal Palace. It was played 22 times in the Oval (the inaugural competition in 1872, and then all but two times until 1892). After the Oval, Crystal Palace hosted 21 finals from 1895 to 1914, broken up by 4 four replays elsewhere. The other London venues were Stamford Bridge from 1920 to 1922 (the last three finals before the move to Empire Stadium); and Oxford University's Lillie Bridge in Fulham for the second ever final, in 1873. The other venues used sparingly in this period were all outside of London, as follows:
How many times was the FA cup final played outside of London?
Answer:
unanswerable