Gamma-ray spectroscopic determination of iodine-131 and cesium-137 in foods: Two collaborative studies

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Journal of the Association of Official Analytical Chemists; (USA)

OSTI ID:5600304

Baratta, E J; Easterly, D G ^[1]

---

1. Winchester Engineering and Analytical Center, Winchester, MA (USA)

The AOAC method for iodine-131, cesium-137, and barium-140 in milk by gamma-ray spectroscopy (48.025-48.029) was extended to include other foods for the radionuclides iodine-131 and cesium-137. Two collaborative studies were performed to validate this extension. In the first study, a food sample containing 119 pCi {sup 131}I/kg and 53 pCi {sup 137}Cs/kg was sent to each of 45 laboratories for triplicate analyses. For 25 responses, the mean of the reported values was 123.8 pCi/kg for iodine-131, and for 27 responses, the mean was 53.4 pCi/kg for cesium-137. Repeatability (within-laboratory) standard deviations (Sr) for iodine-131 and cesium-137 were 4.6 and 3.7 pCi/kg, respectively. Reproducibility (among-laboratories) standard deviations (SR) for iodine-131 and cesium-137 were 12.1 and 6.0 pCi/kg, respectively. In the second study, a food sample containing 25 pCi {sup 131}I/kg and 27 pCi {sup 137}Cs/kg was sent to each of 54 laboratories for triplicate analyses. For 21 responses, the mean of the reported values was 25.0 pCi/kg for iodine-131, and for 19 responses, the mean was 28.9 pCi/kg for cesium-137. Sr Values were 4.0 and 1.6 pCi/kg for iodine-131 and cesium-137, respectively, and SR values were 5.0 and 2.8 pCi/kg, respectively. The method extension was adopted official first action.

• OSTI ID: 5600304
• Journal Information: Journal of the Association of Official Analytical Chemists; (USA), Journal Name: Journal of the Association of Official Analytical Chemists; (USA) Vol. 72:4; ISSN 0004-5756; ISSN JANCA
• Country of Publication: United States
• Language: English

Related Subjects

560162* -- Radionuclide Effects
Kinetics
& Toxicology-- Animals
Plants
Microorganisms
& Cells
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKALI METAL ISOTOPES
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BODY FLUIDS
CATTLE
CESIUM 137
CESIUM ISOTOPES
CONTAMINATION
DAYS LIVING RADIOISOTOPES
DOMESTIC ANIMALS
FOOD
FOOD CHAINS
GAMMA SPECTROSCOPY
INTERLABORATORY COMPARISONS
INTERMEDIATE MASS NUCLEI
IODINE 131
IODINE ISOTOPES
ISOTOPES
MAMMALS
MATERIALS
MILK
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
RUMINANTS
SPECTROSCOPY
VERTEBRATES
YEARS LIVING RADIOISOTOPES