Abstract
This paper presents a study of the 222Rn absorption properties of EJ-212 and BC-400 plastic scintillators (PSs). The diffusion length and the partition coefficient of 222Rn from air are determined at $T=21^{\circ }\text{C}$ , which fully characterize the radon absorption properties of these PS at this temperature. The pulse-shape discrimination (PSD) properties of the PS and their energy resolution are studied experimentally. It is found that PSD is applicable to discriminate between the $\alpha $ - and $\beta $ -pulses of the 222Rn and its short-lived progeny absorbed in the volume of the PS and that the $\alpha $ -peaks energy resolution of PS is the same as that of a liquid scintillation cocktail. The steady-state 222Rn diffusion in plate-parallel PS is studied and the transient time needed to reach it is estimated. Examples of steady-state distributions of the 222Rn activity concentration in the volume of PS are presented and discussed. The results of this study have two applications: for the measurement of 222Rn in air by absorption in EJ-212 or BC-400 PSs and for the estimation of the contribution of 222Rn to the background signal when the PSs are used for other measurements like low-background measurements and portal monitoring.
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