Physical Data
- Radiation: Gamma 140.51 keV (89.1% abundance)
- No beta particles emmited.
Half-Life
- Physical: 6.02 hours
- Biological: 24 hours
- Effective: 4.80 hours
Range
- Dose rates from unshielded 1.0 mCi point source.
- 1.0 cm ........... 760.00 mR/hr
- 10.00 cm ....... 7.6 mR/hr
- 100.00 cm...... 0.076 mR/hr
- 6.0 in.............. 3.270 mR/hr
External Hazard
- External and internal exposure and contaminate hazard.
Internal Hazard
- Critical Organ: Total Body
- Carrier or compound (radiopharmaceutical dependent)
Shielding
- 1/4" to 1/2" lead shielding is adequate for Tc-99m 140 keV gammas
Safety Guidelines
- Tc-99m is used in clinical and research diagnostic scanning and imaging.
- Always wear lab coat and disposable gloves.
- Whole Body and ring dosimeters are required.
updated 1/2013