System for creating and maintaining a radon-free space up to a radon concentration of mBq / m3 and the concentration of products of its conversion up to µBq / m3 that can reduce other radiation environment components and create a clean room

摘要

The system consists of a closed space (3) for placing objects and a device, all walls and ceiling of which are made of a material with a diffusion resistance for radon D 10m / s. The material, including all objects located in a confined space (3), is selected such that the total radon emanation in the confined space (3) is less than 1 mBq.h at an air exchange coefficient k = 1. The enclosed space (3) has a first entrance door (3.1) opening into a closed space (3) and provided with a seal with a radon diffusion resistance D 10m / s. An air outlet from the device (1) for delivering non-air-free air with a minimum overpressure of 5 Pa to the environment and a radon concentration at its outlet of less than 10 mBq / m is discharged into the enclosure (3). The enclosure (3) is insulated under the floor (8) against radon penetration from the subsoil. Any leakage of the enclosure (3) is sealed with sealant or foil having a diffusion resistance for radon D 10m / s. At the same time reducing the aerosol in the enclosure (3), the device (1) for delivering air-free air is discharged into the enclosure (3) via an auxiliary circulation space (13) and through a filtration ventilation aerosol system (14) located in the ceiling of the enclosure (3) and closed by a shielding cover (15) and interconnected.