3. Uptake of Strontium 90 3.1 Milk Since early 1951, HASL has monitored milk for strontium 90 activity. Powdered milk from Perry, New York and liquid milk purchased in New York City have been analyzed weekly. In 1955, five additional United States locations and Japan and England were included in the program. Samples have been received from England since April 1957 but now serve cross-checking purposes since England monitors her own milk. Samples from Japan are received sporadically; samples from State College, Mississippi; St. Louis, Missouris and Portland, Oregon have not been received since 1956. These latter data can be found in HASL-L2, “Environmental Contamination from Weapon Tests", - 56 -