Measurement of Periodicity in 32P Concentration in Breast Tumors with an Automated Integral Counting Technique

Radioactive phosphorus
32
P has been used extensively in the assessment of cellular activity. By using mica end-window geiger tubes in contact with surface breast tumors, circadian fluctuations of the
32
P content of breast tumors have been demonstrated in vivo. This paper describes the equipment used and summarizes the results obtained.