Determination of 131I, 137Cs, and 140Ba in fluid milk by gamma spectroscopy

Radionuclides in Milk, Determination of Picocurie Concentrations of Iodine-131 in Milk

“…Calculation of total thioglucosides w'as based on the total sulfate titrated from the aliquot to which nwrosinase was added. To estimate oxazolidinethioneforming thioglucosides an aliquot of the water extract was buffered to pH 7 and the thioglucosides w'ere converted by mustard myrosinase. After 3 hours at 38°to 40°C.…”

“…For animal metabolism and human intake studies, gamma spectral analysis of a gallon of milk (7) with a sensitivity of 10 picocuries (pc.) per liter is satisfactory; for environmental detection at the 1 pc.…”

“…per liter level, beta counting, with its lower background and higher counting efficiency, appears to be more appropriate. In preparing for beta counting, the bulk of the milk is now' removed from the iodine by ashing (5) or solvent extraction (7).…”

Radionuclides in Milk

“…The sampling procedures are the same as described in the previous report (3). All the 7-emitting radionuclides are determined according to the method described by Hagee et al (6), while Sr89 and Sr90 are determined by radiochemical methods (70, 73).…”

Field Method for Rapid Collection of Iodine 131 from Milk

“…These methods involve either the adsorption of iodine 131 on anion exchange resin and determination of its activity by gamma count¬ ing (3)(4)(5) or determination entirely by gamma spectroscopy (6 …”