Can plutonium isotopes still be detected in testing for particles?

Alpha radiation is essentially an atom that emits a helium nucleus (2 protons/2 neutrons) to reduce excess energy. The alpha particles do not penetrate past the aluminum walls that surround our germanium detector, so we are limited to looking for gamma-rays that are sometimes emitted from the decay products. If one wants to identify plutonium from alpha's, you would need an alpha spectroscopy setup. Here is a good app note from Canberra. Currently we do not have plans to do alpha spectroscopy on these samples.