Information about the size distribution of radioactive aerosols in nanometre range is essential for the purposes of air contamination monitoring, dose assessment to respiratory tract and planning of protective measures. The diffusion battery, which allows capturing particles in the size range of 0.1-10 nm, has developed. Interpreting data obtained from diffusion battery is very complex. The method of expectation maximisation by Maher and Laird was chosen for indirect inversion data. The experiments were performed in the box with equivalent equilibrium concentration of radon in the range of 7000-10,000 Bq m(-3). The three modes of size distribution of radon decay products aerosols were obtained: activity median thermodynamic diameter (AMTD) 0.3, 1.5 and 5 nm. These modes can be identified as: AMTD 0.3 nm--atoms of radon progeny (218Po in general); AMTD 1.5 nm--clusters of radon progeny atoms and non-radioactive atoms in the atmosphere; AMTD 5 nm--particles formed by coagulation of previous mode clusters with existing aerosol particles or nucleation of condensation nuclei containing atoms of radon progeny.
Abstract. Pulsed accelerators with high dose microorganisms are poorly understood. The objectives of our study effects of pulsed electron beams on microorganisms; 2) microorganisms interesting in the context of food safety accelerators: URT-1 and URT-0.5. Experiments on the dose distribution in the layer of 80 mg/cm URT-1 showed that the penetration of radiation at URT more suitable than URT-0.5.We investigated (Klebsiella, Citrobacter, Staphylococcus aureus, Salmonella) and fungal (Aspergillus) food spoil for Staphylococcus aureus, Salmonella, fungus Aspergillus reduced by 40-50%, 11 kGy is the dose at which radappertization). The inactivation of accelerator URT-0.5.
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