Short-lived nuclide radioactive decay compensation by counting geometry variation in NAA

In short-lived nuclide activation analysis, short-time counting periods, due to rapid radioactive decay, and limited count rates, to avoid dead-time corrections, lead to low counting statistics. This can be improved by cyclic activation, being limited by the sample container strength and by radioactivity build-up. With the new device, longer counting periods and thus better counting statistics, leading to higher accuracy and sensitivity, are achieved by changing the geometry factor during counting for radioactive decay compensation.