[A] Selenium
[B] Tellurium
[C] Neon
[D] Krypton
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The correct answer [D] Krypton
[A] Selenium – Selenium is a non-metal element with atomic number 34. It is found in minerals and is used in the manufacturing of electronic devices, pigments, and as a dietary supplement. Selenium does not have any isotopes that can be used to detect secret nuclear fuel reprocessing facilities.
[B] Tellurium – Tellurium is a non-metal element with atomic number 52. Tellurium-132 is a non-destructive isotope used to detect the presence of secret nuclear fuel reprocessing facilities, as it is a by-product of the reprocessing of nuclear fuel, and the release of tellurium-132 into the air can indicate that a reprocessing facility is in operation.
[C] Neon – Neon is a chemical element with atomic number 10 and is a gas at standard temperature and pressure. It does not have any isotopes that can be used to detect secret nuclear fuel reprocessing facilities. Neon is widely used in neon lighting and advertising signs.
[D] Krypton – Krypton is a chemical element with the symbol Kr and atomic number 36. It is a colorless, odorless, tasteless, inert monatomic gas that is present in trace amounts in the atmosphere and is used in some types of gas lamps. It does not have any isotopes that can be used to detect secret nuclear fuel reprocessing facilities.
The answer to the question is [B] Tellurium.
This non-metal has an isotope, krypton-85, which can be used to detect secret nuclear fuel reprocessing facilities. This isotope is present in the atmosphere and has been used to detect several such facilities in North Korea and Pakistan.
Reactor-grade plutonium, which is rich in heavier isotopes, is not suitable for weapons but can be recycled as fresh fuel to save up to 30% of natural uranium.