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Page Title: Table I. Minimum Testing Levels (MTLs) for Direct Radiobioassay Performance Testing
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DOE-STD-1112-98
TABLE I. Minimum Testing Levels (MTLs) for Direct Radiobioassay Performance Testing by
Measurement Category and Radionuclide (Adapted from ANSI N13.30 Performance
Testing for Radiobioassay ANSI 1996)
MTL(b,c)
Measurement Category
Type
Radionuclide
I.
Transuranium elements via L x-
Lung
Plutonium-238
9.0 kBq
ray
(0.24 Ci)
II.
Americium-241
Lung
Americium-241
0.10 kBq
(2.7 nCi)
III.
Thorium-234
Lung
Thorium-234 in equilibrium with
0.50 kBq
its parent in natural Uranium
(14 nCi)
IV.
Uranium-235
Lung
Uranium-235
30 Bq
(0.81 nCi)
Any two of four(a):
V.
Fission and activation products
Lung
3.0 kBq
(81 nCi)
Cobalt-58
Cobalt-60
Cerium-144(e)
30 kBq
(0.81 Ci)
-----
Plus:
3.0 kBq
Cesium-134(d)
(81 nCi)
Cesium-137(d)
VI.
Fission and activation products
Total body
All of:
3.0 kBq
Cesium-134
(81 nCi)
Cesium-137
each
Cobalt-60(d)
Manganese-54(d)
VII.
Radionuclides in the thyroid
Thyroid
Iodine-131 or Iodine-125
3.0 kBq
(81 nCi)
(a)
Direct radiobioassay facility may elect to be tested for a specific radionuclide or may elect to be tested for
the category. The testing laboratory will select the test radionuclides if a category is requested.
(b)
The upper bound of the testing range shall not exceed 20 times the stated MTL.
(c)
The activity of the highest and lowest radionuclides (not including Potassium-40) in any one test phantom
shall be within a factor of three of each other; except for Cerium-144 in Category V, whose activity shall not
exceed that of any other radionuclide by greater than a factor of 30.
(d)
These radionuclides shall be present in the phantom for interference but shall not be tested.
(e)
Cobalt-57 may be substituted for Cerium-144 for performance testing purposes due to difficulties in the
availability of Cerium-144.
Reference: American National Standard N13.30 "Performance Criteria for Radiobioassay," 1996, American
National Standards Institute, Washington, DC.
13


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