After one half life period (t1/2) it becomes = No/2. Let the initial amount of a radioactive substance be No. Half life periods vary from billions of years for some radio isotopes to a fraction of a second. It is defined as “time during which half the amount of a given sample of the radioactive substance disintegrates”. Rutherford introduced a constant known as half - life period. The law of radioactive disintegration may be defined as the quantity of radioactive substance which disappears in unit time is directly proportional to the amount of radioactive substances present or yet not decayed. The rate of disintegration of a given substance depends upon the nature of disintegrating substance and its total amount. The radioactive decay of the different radioactive substances differ widely.
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