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1. 99 Tc m is produced in a generator from it’s parent 99 Mo.

2. 99 Mo is produced in a reactor and has a 67 hour half life.

3. When the generator is left alone for a period of time, the level of activity from the 99 Tc m reaches a transient equilibrium: this means that the 99 Tc m is decaying as quickly as it’s being formed.

4. We elute the 99 Tc m from the generator by washing it off the column with sterile saline: this gives us sodium pertechnetate which has a physical half life of 6 hours.

5. Technetium generators usually last about a week.

6. Molybdenum is produced in a nuclear reactor.


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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