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BSMA

R1. C3. C1. Filter step 3.5 sheet 0.5, gap 3.0. Condenser width 260, HV electrode thickness 3.0 Collector size 32.4×170.6, gap 1.3. 55.5. V. C0. E. C2. C4. R2. 10. 60. 10. 55. 80. 35. 55. 25. BSMA. Aerosol inlet. h. u. E.

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BSMA

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  1. R1 C3 C1 Filter step 3.5 sheet 0.5, gap 3.0 Condenser width 260, HV electrode thickness 3.0Collector size 32.4×170.6, gap 1.3 55.5 V C0 E C2 C4 R2 10 60 10 55 80 35 55 25 BSMA

  2. Aerosol inlet h u E Ballast air(could be recirculated to sheath air) Sheath air inlet a Aerosoloutlet h V b d Plain IGMA

  3. gap 2 + 18 mm step 12.5 mm gap 20 mm Modified IGMA The ions in the outlet are collected by a well-insulated and shielded electrostatic filter powered by an internal battery and DC-DC converter. The collector is connected to the ground through an electrometric amplifier. Electrostatic shielding from the high voltage deflector grid allows free manipulation with mobility control voltage. The deflector grid is connected to a RC circuit with a time constant of about 4 s. The capacitor of this circuit is quickly charged up to 6 kV and slowly discharged through the resistor with a period of 20 s. This assures the logarithmical scanning of mobility from the lowest to the highest value of the mobility range during the 20 s period.

  4. TRAJECTORIES OF IONS IN A MODIFIED IGMA

  5. NOISE Noise : cm–3 wintertime outdoor air, rime and light snowfall 30 closed room,rich in radon 20 BSMA IGMA 10 0 3 0.03 0.1 1 0.03 cm2V−1s−1 Mobility 3 cm2V−1s−1 Mobility : cm2V−1s−1

  6. ACCUMULATION AND DECAY OF RADON DAUGHTERS BSMA Fan on Fan off

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