Decay product

In many cases, individual members of the decay chain are as radioactive as the parent, but far smaller in volume/mass.

Thus, although uranium is not dangerously radioactive when pure, some pieces of naturally occurring pitchblende are quite dangerous owing to their radium-226 content,[2] which is soluble and not a ceramic like the parent.

Although it cannot be predicted whether any given atom of a radioactive substance will decay at any given time, the decay products of a radioactive substance are extremely predictable.

Such studies are done to measure pollution levels (in and around nuclear facilities) and for other matters.

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The decay chain from lead-212 down to lead-208, showing the intermediate decay products