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Iodine-131
(131I)
Physical Data:
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Intensity |
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806 keV
(max.)
365 keV |
89.3%
81.2% |
- Radioactive Half
Life
- Biological Half Life
- Effective Half Life
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8 days
80.4 days,
thyroid
7.3 days
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Radiological Data:
- Dose rate at:
- 100 cm
from 1 µCi,
0.03 mr/hr
- 10 cm
from 1 µCi,
28.3 mr/hr
- 1 cm from
1 µCi,
2829.4 mr/hr
- Dose rate to basal
cells from skin contamination - 5030
mr/hr per µCi per
cm2
Shielding:
- 1/3 inch lead for <5 µCi
- 1 inch lead for >5 µCi
Survey Instrumentation:
- Geiger-Mueller Counter
- NaI (Sodium Iodide)
detector
- Liquid Scintillation
Counter (LSC)
- LS window
0 to 700
- LS efficiency
70%
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