Radiation - table of isotopes
Approved isotopes for use at St. Lawrence University
The maximum activity amount is institution wide, not per investigator.
All radioactive materials must be procured through the RSO
| ITEM | ELEMENT & MASS | FORM | MAXIMUM ACTIVITY | HALF-LIFE |
|---|---|---|---|---|
| 1 | HYDROGEN 3 | ANY | 2 MILLICURIES | 12.26 Y |
| 2 | CARBON 14 | ANY | 10 MILLICURIES | 5568 Y |
| 3 | SODIUM 22 | ANY | 2 MILLICURIES | 2.6 Y |
| 4 | PHOSPHOROUS 32 | ANY | 10 MILLICURIES | 14.2 D |
| 5 | PHOSPHOROUS 33 | ANY | 10 MILLICURIES | 25 D |
| 6 | SULFER 35 | ANY | 10 MILLICURIES | 87.2 D |
| 7 | CHLORINE 36 | ANY | 10 MILLICURIES | 300000 Y |
| 8 | CALCIUM 45 | ANY | 10 MILLICURIES | 163 D |
| 9 | CHROMIUM 51 | ANY | 10 MILLICURIES | 27.8 D |
| 10 | COBALT 57 | ANY | 2 MILLICURIES | 272 D |
| 11 | COBALT 60 | ANY | 10 MILLICURIES | 5.24 Y |
| 12 | STRONTIUM 90 | ANY | 10 MILLICURIES | 28 Y |
| 13 | RUTHENIUM 106 | ANY | 10 MILLICURIES | 2.2 H |
| 14 | IODINE 125 | ANY | 10 MILLICURIES | 60 D |
| 15 | IODINE 131 | ANY | 10 MILLICURIES | 8.07 D |
| 16 | CESIUM 137 | ANY | 10 MILLICURIES | 29.68 Y |
| 17 | THALLIUM 204 | ANY | 10 MILLICURIES | 3.75 Y |
| 18 | BISMITH 207 | ANY | 10 MICROCURIES | 30 Y |
| 19 | LEAD 210 | ANY | 10 MICROCURIES | 22 Y |
| 20 | RADIUM 226 | ANY | 25 MICROCURIES | 1620 Y |
| 21 | PROTACTINIUM 231 | ANY | 10 MICROCURIES | 32480 Y |
| 22 | THORIUM 232 | ANY | 10 MICROCURIES | FOREVER |
| 23 | URANIUM 234 | ANY | 10 MICROCURIES | FOREVER |
| 24 | URANIUM 238 | ANY | 10 MILLICURIES | 99 Y |
| 25 | PLUTONIUM 239 | SEALED | 5 CURIES | 24360 Y |
| 26 | AMERICIUM 241 | ANY | 10 MICROCURIES | 458 Y |