CONSTRUCTION AND CALIBRATION OF A CONDENSATION NUCLEUS COUNTER FOR THE MEASUREMENT OF AITKEN PARTICLES IN THE HARMATTAN HAZE
CONSTRUCTION AND CALIBRATION OF A CONDENSATION NUCLEUS COUNTER FOR THE MEASUREMENT OF AITKEN PARTICLES IN THE HARMATTAN HAZE
No Thumbnail Available
Date
1989-02-27
Authors
IBRAHIM, SHEHU MUSTAPHA
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
One type of atmospheric condensation nucleus
i s the Aitken p a r t i c l e which has r a d i i ranging
between 0.005 and 0.1 microns. In t h i s work,
a locally constructed condensation nucleus counter
s u i t a b l e for the measurement of the concentration
of Aitken nuclei in the Harmattan haze is
described.
F i l t e r e d a i r is drawn into the previously
evacuated . system to a pressure of about 2 x 104
Pa and then released. The concentration of the
Aitken nuclei in the air drawn into the apparatus
is deduced from the reading of the photocurrents
Io and I through the pressurized and rarefied a ir
in the system respectively.
Measurements of p a r t i c l e s in ambient air with
the counter show that the concentration of Aitken
nuclei in the l o c a l i t y is up to 3 x 1011 p a r t i c l es
per l i t r e.
Description
Submitted to the Postgraduate School,
Ahnadu Bello University, Zaria, in Partial
Fulfilment of the Requirements for 'the Degree of
MASTER OF SCIENCE (NUCLEAR PHYSICS)
DEPARTMENT OF PHYSICS
AHMADU BELLO UNIVERSITY, ZARIA
Keywords
CONDENSATION NUCLEUS,, COUNTER,, MEASUREMENT,, AITKEN PARTICLES,, HARMATTAN HAZE