|
|
.gif) |
CARBON - 14
(14C)
| Physical Half-life: | 5730 years |
| Radiations: | -ß 156 keV |
|
| External Exposure: | Low energy ß,
not external hazard, radiation badge not necessary. |
|
| Biological Data: |
ALI | 2 mCi |
| Biological half-life |
10 days |
| Effective half-life |
10 days |
| Critical Organs |
Whole body and fat |
| Bioassay |
Urinalysis |
| Shielding: |
| |
None is recommended. Range of ß in air is 10" and 0.010" in
lucite. |
Monitoring
& Efficiency |
LSC (Eff. ~85%)
Thin-window GM (Eff. ~5%) |
Special Considerations
- Work with volatile forms or procedures that may produce volatile
compounds, (i.e., 14CO2), must be done in a fume
hood.
- 14C has a long half-life, do not correct for radioactive
decay.
- Some 14C labeled compounds may penetrate the skin. Wear
two pairs of gloves and change the outer layer frequently.
- Use caution when handling 14C labeled halogenated acids.
These penetrate the skin and give high radiation doses.
- Most 14C compounds are rapidly metabolized and exhaled as
14CO2.
- Do not cover the thin-window of your GM survey meter with a cap,
plastic or parafilm; they will shield the detector and you will not be
able to detect low energy beta emitters like 14C.
|
.gif){kind=spacer}