Nicholson (1963)Sumerling & Darby (1981)
Sumerling & Darby (NRPB 1981) have a variety of solutions, including a derivation of
- Nicholson, W.L. Fixed Time Estimation of Counting Rates with Background Corrections. AEC Research and Development Report HW-76279; 1963.
- Sumerling, T.J.; Darby, S.C. Statistical Aspects of the Interpretation of Counting Experiments Designed to Detect Low Levels of Radioactivity. NRPB-R113. Chilton UK: National Radiological Protection Board; 1981.