Nuclear particle emission spectroscopy could potentially be used to characterize microscopic defects for undetectable card marking in the following ways:
1. Alpha particles: Alpha particles are emitted during the decay of radioactive isotopes and can penetrate through materials such as paper and plastic. Measuring the emission of alpha particles from a card can provide information about the presence of defects or alterations.
2. Neutron activation analysis: Neutrons can interact with certain elements in a card, causing them to emit gamma rays that can be detected and analyzed. This technique can be used to identify very small changes in the composition of the card.
1. Alpha particles: Alpha particles are emitted during the decay of radioactive isotopes and can penetrate through materials such as paper and plastic. Measuring the emission of alpha particles from a card can provide information about the presence of defects or alterations.
2. Neutron activation analysis: Neutrons can interact with certain elements in a card, causing them to emit gamma rays that can be detected and analyzed. This technique can be used to identify very small changes in the composition of the card.