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R.E.H.S. pursues an aggressive decay-in-storage
program that solidly backs the University's commitment
to the community and the environment. When properly
segregated, 80% of the waste can be decayed on
site.
The commitment of research staff to this program
is the key to its success. An extremely important
part of this process is the proper segregation
of radioactive isotopes.
Select
the type of waste you're interested in:
Solid
Waste
Solid
wastes are grouped (or segregated) by half-life.
| Half
life range in days |
Examples |
| <
15 days |
32P,131I |
| >
15 days and < 120 days |
33P,35S,51Cr,125I |
| >
120 days -3H & 14C only |
3H,
14C |
| >
120 days - all others |
45Ca,
36Cl |
Liquid
Waste
Liquids
are segregated into aqueous and organic waste
streams and then are grouped (or segregated) by
half-life.
| Aqueous |
Organic |
| Water, Buffer, Urine etc. |
Ethanol Methanol Acetonitrile
Acetone |
| Follow half-life segregation
scheme |
Chloroform etc. with or without
water |
| |
Follow half-life segregation
scheme |
-
then -
| Half
life range in days |
Examples |
| <
15 days |
32P,131I |
| >
15 days and < 120 days |
33P,35S,51Cr,125I |
| >
120 days -3H & 14C only |
3H,
14C |
| >
120 days - all others |
45Ca,
36Cl |
Liquid
Scintillation Vials (LSV) 
LSV's are are now grouped by half-life as with liquid and solid wastes. This change should be implemented by your lab as soon as possible. Contact REHS if you need help with this transition.
| Half life range in days |
Examples |
| < 15 days |
32P,131I |
| > 15 days and < 120 days |
33P,35S,51Cr,125I |
| > 120 days -3H & 14C only |
3H, 14C |
| > 120 days - all others |
45Ca, 36Cl |
Check
out the REHS approved scintillation and flow fluids.
Biological
/ Animal Wastes
Biological / Animal wastes are also grouped by
half-life:
| Half
life range in days |
Examples |
| <
120 days |
32P,
131I, 33P,35S,51Cr,125I |
| >
120 days |
3H
& 14C only 3H, 14C |
| >
120 days |
all
others 45Ca, 36Cl |
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