Preparation of Thin Sources for Absolute Beta-Counting

Nucleonics

“…Papers continue to appear on calibration of well type Nal(Tl) detectors (75), efficiencies of GeLi detectors (74), of SiLi detectors (75), and -ray intensities for calibration of Ge detectors (76). A method for preparation of thin sources of absolute ß counting has been reported (77), and two new counters, a position sensitive detector for thermal and epithermal neutron (78) and an avalanche chamber for particle detection (79) have made news. New nuclear measurements of interest include half-lives of long-lived radionuclides (80), the half-life of 137Cs (29.86 ± 0.27y) by a new method (81) and the half-life of 239Pu (24, 119 ± 26y) (82).…”