Question

The activity of a radioactive substance is the number of atoms?

Answer 1

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▶ The activity of a radioactive substance is measured in terms of the number of disintegrations a given radioactive sample undergoes in one second. The number of disintegrations a given radioctive sample undergoes in one second depend on,

1. The number of active atoms present in the sample ie its mass. More the active atoms present in the ample, more is the number of disintegrations that happen per second.

2. It depends on the decay constant of the radioactive substance. The larger the decay constant the more the disintegrations that occur in one second. The decay constant is inverse of the mean-life expressed in seconds of the radioactive sample. So shorter the mean-life ( mean-life = half-life ÷ 0.693) or half-life, the larger the decay constant. So a radioactive sample with a shorter half-life shall disintegrate more in a given time than a longer lived sample.

So activity of a sample only depends on its mass, and its half-life.

Hope it helps.

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