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|  DOE-HDBK-1106-97
Instructor's Notes
SULFUR-35 (S-35)
Sulfur-35 is a low-energy beta emitter similar to carbon-14. Most
common means of detection is with liquid scintillation.
1. Maximum energy: 0.167 MeV (the average energy is
0.056 MeV).
2. Maximum range in air: 10 inches (24 cm).
3. Maximum range in tissue: 0.32mm.
4. IAEA toxicity classification: Medium-low.
5. Physical half-life: 87.4 days.
6. Effective half-life (Teff): 77 days.
7. Critical organ: Whole body and testis.
8. Personnel monitoring: Bioassay - urinanalysis, NOT
detected with a dosimeter (TLD or film).
9. ALI:
10 mCi (4 x 108 Bq) inorganic compounds (vapor
inhalation).
2 mCi (7 x 107 Bq) by inhalation, weekly clearance.
6 mCi (2 x 108 Bq) by ingestion.
10. Shielding: 3mm of plexiglass (if needed).
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