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FUNDAMENTAL DECAY EQUATION

Physics

FUNDAMENTAL DECAY EQUATION

1. The number of radioactive atoms remaining in a sample and time— the fundamental decay equation:
N t = N 0 e −λt or A t = A 0 e −λt

2. Where N t is the number of radioactive atoms at time t, A t is the activity at time t, N 0 is the initial number of radioactive atoms, A 0 is the initial activity, e is the base of natural logarithm = 2.718..., λ is the decay constant = ln 2/T p 1⁄2 = 0.693/T p 1⁄2 , and t is the time. T p 1⁄2 = 0.693/λ


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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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