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NUCLEID

Physics

NUCLEID

TERMINOLOGY
1. A nucleid is an atomic species characterised by its number of protons (Z) and neutrons.
2. Nuclides with the same number of protons are the same element.
3. Nuclides with the same atomic number (Z) but different atomic mass (A) are called isotopes (the number of neutrons varies).

RADIOACTIVITY
4. When an unstable (i.e., radioactive) atomic nucleus undergoes the spontaneous transformation, called radioactive decay, radiation is emitted as a byproduct.
5. Unstable nuclei (with a neutron excess or deficit) are radioactive and decay until they become stable with emission of any combination of radiation - Alpha (α), Beta (β - ), Positron (β + ), Gamma (γ), K-electron capture, isometric transition.
6. Gamma rays (γ) - high energy photons released from an excited nucleus.


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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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