Absolute cosmic ray ionization measurements in a 900-liter chamber

Details Absolute cosmic ray ionization measurements in a 900-liter chamber Absolute cosmic ray ionization measurements in a 900-liter chamber

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.5539k&link_type=abstract

Journal of Geophysical Research, vol. 83, Dec. 1, 1978, p. 5539-5549.

Other

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Atmospheric Ionization, Cosmic Rays, Density Measurement, Ionization Chambers, Ionizing Radiation, Radiation Effects, Air, Aluminum, Background Radiation, Calibrating, Instrument Errors, Low Noise, Thin Walls

Scientific paper

An air-filled 906-liter thin-walled aluminum chamber of spherical geometry is used to measure the cosmic ray ionization intensity at sea level over Lake St. Clair and Lake Huron during 1973 and 1974. The objective is to verify George's (1970) work and, in general, to follow the goal of precise low-noise absolute measurements in the background level radiation fields. It is found that the difference between George's published value - 2.60 ion pairs per cu cm per sec STP air and that observed in the present study - 2.15 ion pairs per cu cm per sec STP air - is about 17%, which is the estimated percentage calibration error reported by Carmichael (1971). George's altitude data normalized to the sea level value are plotted along with a number of measurements by other investigators.

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