RadioactiveDecay

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Process: G4RadioactiveDecay

Description:
- This process provides for electron capture, isomeric transition, beta+, beta-, and alpha decay of unstable isotopes.

G4RadioactiveDecay* radDecayProc = new G4RadioactiveDecay();
ionProcessManager->AddDiscreteProcess(radDecayProc);

NOTE: User must first download radioactive decay file from Geant4 web page to a local directory, say RadioactiveDecay/, then
```
setenv G4RADIOACTIVEDATA /RadioactiveDecay
```