In this work we have studied aerosol formation at ultra-low ionisation levels, using the existing deep underground science facility at Boulby mine, UK. At 1100 m depth, with a corresponding factor 106 reduction in cosmic ray muon flux, the Boulby facility is an ideal place to study the role of ions in aerosol nucleation. By exposing a controlled volume of air to varying levels of ionising radiation, and with the minimum ionisation level vastly reduced compared to normal surface laboratory conditions, we have provided both a validation of earlier studies of ion-induced nucleation and extended the measurements to ionisation levels approximately 3 order of magnitudes lower than any earlier study. Getting this close to zero ionisation allows us to distinguish between the neutral and charged contribution better than previously. The effect is explored over a range of sulphuric acid concentrations.
|Publication status||Published - 2010|
|Event||International Aerosol Conference 2010 - Helsinki, Finland|
Duration: 29 Aug 2010 → 3 Sep 2010
|Conference||International Aerosol Conference 2010|
|Period||29/08/2010 → 03/09/2010|