Gamma and X-ray Emitters
|
Radioisotope
|
Half-life
|
Half-value layer
|
Tenth-value layer
|
|
Chromium-51
|
27.7 days
|
1.8 mm of lead
|
6.0 mm of lead
|
|
Iodine-125
|
60.14 days
|
0.02 mm of lead
|
0.06 mm of lead
|
|
Iodine-131
|
8.04 days
|
2.9 mm of lead
|
9.6 mm of lead
|
|
Technicium-99m
|
6.02 hours
|
0.025 mm of lead
|
0.083 mm of lead
|
|