1. Other radionuclides decay by gamma emission , which is very penetrative. 2. Metastable isomeric transition is the only nuclear decay mode that approaches pure gamma emission . 3. The hard gamma emissions also create a radiological hazard which requires remote handling during reprocessing. 4. Another example is the alpha decay of to form; which is followed by gamma emission . 5. 99m Tc decays by gamma emission , with a half-life : 6.01 hours. 6. Delayed gamma emissions are the most common form of delayed radiation but are not the only form. 7. Gamma emission from these isomers may have enough energy to start a thermonuclear reaction, without requiring any fissile material.8. Gamma emission is " absolutely forbidden " when the nucleus begins in a zero-spin state, as such an emission would not conserve angular momentum.9. Just as in the above delayed gamma emission , the nitrogen is not the actual source of the neutrons, a short lived isotope of oxygen is. 10. However, gamma emission is absolutely forbidden when the nucleus begins in a zero-spin state, as such an emission would not conserve angular momentum.
