New three-count technique for short-lived radon decay products in air

Up to the present, radon and its short-lived decay products in air are usually monitored by means of alpha detection. But radon progeny, including paB (Pb-214) and RaC (Bi-214) which are beta and gamma emitters, contribute about 90% to the equilibrium equivalent radon concentration ( EECRn). Therefore, this paper introduces a new three-count technique by a beta detector in the light of radioactive decay lan and its boundary conditions during sampling and counting times to solve the Bateman equation. beta ( even ion level beta) instruments have been fairly popularized domestically and internationally. It can be used not only as an instrument for radon and its daughters in air, but also as a monitor for beta airborne activity in the environment. This new method taps further the latent po ner of the present instrument and realizes various uses for a unit.