Study of radio-nuclides decaying by orbital electron capture.

In the field of nuclear science, the radioactive species encountered will decay by alpha emission, by beta emission or by capture of one of the orbital electrons. Sometimes, the nucleus resulting after decay will be left in a metastable state and will lose its excitation energy by emitting a multipole radiation. If the excited state has a measurable half-life (>10^-11sec.), the nuclear metastable state is called a nuclear isomer. Nuclear chemists and technologists are greatly concerned with measurements of these radiations