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|  DOE-HDBK-1106-97
Instructor's Notes
Lungs for inhalation.
Lower large intestine for ingestion.
8. Personnel monitoring: dosimeter and finger rings,
uptakes may be determined by urinalysis.
9. ALI:
0.6 mCi (2 x 107 Bq) by inhalation, clearance in
weeks.
0.4 mCi (1 x 107 Bq) by ingestion.
10. Shielding:
Half-value layer (the thickness required to attenuate
the dose rate by ) is 0.26 inches (6.5mm) of lead.
Multi-hundred mCi quantities need to be completely
surrounded by beta shielding material to prevent the
betas from escaping and creating a source of
secondary annihilation radiation outside the
shielding.
76
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