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Convenient Cadmium-Metal Standard for Checking Neutron, Soil Moisture Probes¹

Ontario Agr. College, Gtielph, Canada

ABSTRACT

A convenient standard was devised for checking the calibration of a neutron-scattering soil moisture depth probe at five fixed points. For a calibration check the probe was placed into one of five waterproof steel tubes immersed in water. Fixed points were obtained by attaching different amounts of cadmium sheet metal to the outside of the tubes to absorb different amounts of the thermal neutrons scattered back by the water. Cadmium-metal standards are applicable as well to surface probes.

¹ Contribution from the Department of Soil Science, Ontario Agr. College, Guelph, Canada.

Received for publication October 26, 1964. Accepted for publication December 30, 1964.