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Rubidium-87 Concentration in Market Milk

Milk and Food Research, National Center for Urban and Industrial Health, U. S. Public Health Service, Cincinnati, Ohio

ABSTRACT

Market milk samples collected on a quarterly basis from various cities in the United States were analyzed for rubidium (Rb) content by atomic absorption spectrophotometry. The ⁸⁷Rb concentrations were computed from the specific activity data. The average ⁸⁷Rb of milk varied from 14.2 to 84.8 pCi/kg of sample. Statistical analysis of the data showed that the ⁸⁷Rb concentration in milk from various cities was significantly different at = 0.01. In addition, samples from cities in the Southeast showed significant differences from one sampling period to another. In general, the ⁸⁷Rb concentration in milk from inland states was less than that of milk from cities of coastal states and those lying in the Missouri and Mississippi Valley.