Determination of Dead Times in the Recently Introduced Hybrid G-M Counter Dead Time Model

Abstract

To extend the usable range of the G-M counters the hybrid G-M counter dead time model adopting paralyzable and non-paralyzable dead times (Tp and TNp) at the same time has been introduced and the relationship between true and observed counting rates (n and m) is more accurately expressed in the hybrid model. Other than the decaying source method, which requires a research reactor, the usual way of determining G-M counter dead time is the split source method. To find two dead times of the hybrid model a modified split source method was suggested. The major modification to the original method includes adoption of two split sources and iterative scheme due to transcendental nature of the hybrid model. The modified split source method was tested using Monte Carlo G-M counter simulator, GMSIM, based on ideal hybrid dead time model. Possibility of using interval distribution between observed events and non- Poisson variance characteristics of G-M counters in finding the dead times was also presented.