When a radioactive isotope decays into a nucleus which is also unstable and undergoes decay, and this process is repeated several times, the succession of reaction is called
a)	Decay series	b)	Fission reaction	c)	Fusion reaction	d)	Spallation

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When a radioactive isotope decays into a nucleus which is also unstable and undergoes decay, and this process is repeated several times, the succession of reaction is called
a)	Decay series	b)	Fission reaction	c)	Fusion reaction	d)	Spallation