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ISOMERIC TRANSITION (DECAY)

Physics

ISOMERIC TRANSITION (DECAY)

1. Often during radioactive decay, a daughter is formed in an unstable state.

2. Gamma rays are emitted as the daughter nucleus undergoes an internal rearrangement and transitions from the excited state to a lower energy state.

3. Some excited states persist for longer periods, with half-lives ranging from nanoseconds (10 -9 s) to more than 30 years. These excited states are called metastable or isomeric states (denoted by the letter “m”).

4. Isomeric transition is a decay process that yields gamma radiation without the emission or capture of a particle by the nucleus. There is no change in atomic number, mass number, or neutron number.


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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