|Beta Max||Half Life|
|0.1013 MeV Mean energy||2.111 x 105 years|
|0.2935 MeV Max energy|
The following quantities will give a dose rate of 2 mSv/h without shielding.
- If handled at distances of 10 cm or more 3 MBq
- If handled at distances of less than 10 cm 30 KBq
Note that these quantities may be handled for a maximum of 15 minutes per day, five days a week, before the dose rate to the fingers is exceeded.
Effective Dose Coefficients
|Inhalation coefficient||Ingestion coefficient||Skin dose coefficient|
|2.9 x 10-10 Sv.Bq-1 - 1μm AMAD, fast clearance||7.8 x 10-10 Sv.Bq-1||3.38 x 10-10 Gy.s-1 per Bq.cm-2|
If the total quantity of technicium - 99 in the laboratory is over 50 MBq, it is necessary to classify the laboratory as a controlled area.
If the total quantity of technicium - 99 in the laboratory is over 10 MBq it is necessary to classify the laboratory as a supervised area.
*50 MBq if inhaled would give rise to an effective dose of 15 mSv.