Chlorine - 36 (C1-36)

DOE-HDBK-1106-97

Instructor's Notes

CHLORINE-36 (Cl-36)

Chlorine-36 is a medium-energy beta emitter. Use a thin-end window

G-M detector or liquid scintillation counter for detection.

1. Maximum energy: 0.710 MeV (the average energy is

0.233 MeV).

2. Maximum range in air: 7 feet (2 m).

3. Maximum range in tissue: 0.1 inch (2.6 mm).

4. IAEA toxicity classification: High-medium.

5. Physical half-life: 3 x 105 years.

6. Effective half-life (Teff): 10-29 days.

7. Critical organ:

Whole body for transportable compounds.

Lung for inhalation.

Lower large intestine for ingestion.

8. Personnel monitoring: Urinanalysis, finger rings.