beta decay
are of two types the beta plus decay and the beta minus decay, the beta plus
decay releases a positron, a proton is
converted to neutron, the atomic number drop by one . therefore if lead undergo
a beta plus decay , the decay nucleus is thallium-211.
on the other
hand if lead under a beta minus decay, a neutron is converted into proton, the
atomic number increase by one while the atomic
mass remain unchanged. the daughter nucleus formed is tellurium-211.
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