Home
Radiology Guides Anatomy Physio & Path Medicine Physics Contact
ELECTRON CAPTURE DECAY

Physics

ELECTRON CAPTURE DECAY

1. Electron capture is an alternative to BETA (PLUS)/POSITRON DECAY for neutron-deficient radionuclides.

2. The nucleus captures an orbital (usually a K- or L-shell) electron, with the conversion of a proton into a neutron and the simultaneous ejection of a neutrino.

3. Nuclides for which the E difference between the parent and daughter > 1.02 MeV may decay by electron capture or positron emission, or both. Heavier proton-rich nuclides are more likely to decay by electron capture.

3. The capture of an orbital electron creates a vacancy in the electron shell, which is filled by an electron from a higher energy shell.

4. This electron transition results in the emission of characteristic x-rays, Auger electrons, gamma rays and other radiation.

5. Thallium-201, (Tl-201) decays to mercury-201 (Hg-201): used in myocardial perfusion studies.


Avatar
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

+ Home