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Page Title:
Table II: Minimum Testing Levels (MTLs) for Indirect Radiobioassay Performance Testing |
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|  DOE-STD-1112-98
TABLE II.
Minimum Testing Levels (MTLs) for Indirect Radiobioassay Performance Testing
by Measurement Category and Radionuclide (Adapted from ANSI N13.30
Performance Testing for Radiobioassay ANSI 1996)
MTL(b) (per L or per
(a)
Measurement Category
Radionuclide
sample)
I.
Beta activity
Hydrogen-3
2 kBq (54 nCi)
average energy < 100 keV
Carbon-14
2 kBq (54 nCi)
Sulfur-35
20 Bq (0.54 nCi)
Radium-228
0.9 Bq (24 pCi)
Phosphorus-32
4 Bq (0.11 nCi)
II.
Beta activity
average energy > 100 keV
Strontium-89/-90
or Strontium-90
4 Bq (0.11 nCi)
III.
Alpha activity isotopic analysis
Thorium-228/-230
0.02 Bq (0.54 pCi)
or Thorium-232
Uranium-234/-235
0.02 Bq (0.54 pCi)
or Uranium-238
0.01 Bq (0.27 pCi)
Neptunium-237
Plutonium-238
0.01 Bq (0.27 pCi)
or Plutonium-239/240
Americium-241
0.01 Bq (0.27 pCi)
1 g (KPA)(c)
IV.
Elements (mass/volume)
Elemental Uranium
V.
Gamma (photon) activity
Cesium-137
2 Bq (54 pCi)
Cobalt-60
2 Bq (54 pCi)
Iodine-125
0.4 kBq (11 nCi)
(a) Indirect 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 radionuclide if a category is requested.
(b) The upper bound of the testing range shall not exceed 20 times the stated MTL.
(c) This MTL differs from the ANSI N13.30 MTL which was initially based upon fluoroscopic measurements.
Since KPA has mostly replaced fluoroscopic analysis, the MTL was reduce appropriately. (KPA = Kinetic
Phosphorescence Analysis)
Reference: American National Standard N13.30 "Performance Criteria for Radiobioassay," 1996, American
National Standards Institute, Washington, DC.
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