The NBS lead paint poisoning project :

Abstract

Data System and a system of information analysis centers dealing with the broader aspects of the National Measurement System; provides appropriate services to ensure that the NBS staff has optimum accessibility to the scientific

The slowing down times of positrons emitted from selected β+ isotopes into metals

“…The stopping power, S(E) = ÀdE/ds, i.e., the energy loss per unit distance traversed in the medium for swift particles, is usually calculated in terms of continuous slowing down approximation (CSDA) according to which energy losses occur almost continuously in small portion through collisions with electrons in the medium. In this approximation the Bethe mean stopping power formula is commonly used, which for positrons is as follows [8]:…”

“…The table also includes the time constants s r from the function(8) which was fitted to the tails of the SDT distributions obtained from CSDA calculations.…”