One of the nuclides in spent nuclear fuel is U-234, an alpha emitter with a half-life of 2.44 × 105 years. If a spent fuel assembly contains 2.80 kg of U-234, how long does it take for the amount of U-234 to decay to less than 0.10 kg?
Solution 73P :
Half-life is the time required for a quantity to reduce to half its initial value, i.e, it is the amount of time taken for substances such as radioactive substance for half of its atoms to decay. It is expressed as t1⁄2.