Final answer:
The daughter nucleus of ^122 v53 after positron emission is ^122 v52.
Step-by-step explanation:
In positron emission, a proton in the parent nucleus is converted into a neutron, a positron, and a neutrino. The daughter nucleus has one less proton and one less electron than the parent nucleus. Therefore, the daughter nucleus of ^122 v53 after positron emission is option (B) ^122 v52.