Table I. Minimum Testing Levels (MTLs) for Direct Radiobioassay Performance Testing

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

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):

Fission and activation products

Lung

3.0 kBq

Manganese-54

(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.