 |
|||
|
|
|||
|
|
|||
| ||||||||||
|
|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Student's Guide
9.
ALI:
0.6 mCi (2 x 107 Bq) by inhalation, clearance in weeks.
o
0.4 mCi (1 x 107 Bq) by ingestion.
o
10.
Shielding:
o
Half-value layer (the thickness required to attenuate the dose rate by 1/2) is 0.26 inches
(6.5mm) of lead.
o
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.
11.
Special considerations:
o
Near an unshielded Na-22 source, dose rates due to beta radiation can be much higher
than dose rates due to gamma radiation.
o
Avoid direct eye exposure by interposing transparent shielding or indirect viewing.
o
Avoid skin dose by indirect handling.
A-6
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals