For the following nuclear reaction, what was the beginning radionuclide (X)?

kmccaffrey

koneal

priest_connor

sara.ojeil.84

olaino

jtaylor

Stephen.McDonald

shani.herbert

rvaughn

lauren.olson

kparkerson664

Nkbarry16

philipp.grinninger

krista.haun

schau

elizabethfalston

kjenkins

tim.souza

cmcfarland