Campbell Scientific CS725 Snow Water Equivalency Sensor - Manual (Page 26)

CS725 Snow Water Equivalency Sensor
The collimator weighs 25 kg (55 lb). CAUTION
A long safety strap is also included for securing the collimator to the mounting
structure once it is installed.
FIGURE 7-1. CS725 components
8. Site Selection Details
It is important to determine if the intended installation site of the CS725 will
have appropriate sources of potassium and thallium to provide sufficient counts
for the expected SWE. It is also important to reduce the affects of background
sources that will adversely affect the SWE measurement.
Do not mount the CS725 in close proximity to wood material or trees. Wood
material can contain potassium (K) and thallium (TI) which can be a source of
gamma radiation that will interfere with the measurements. Potassium sources
above the snow will emit gamma radiation that is not attenuated by the snow
pack. Refer to the following sections for recommendations on how to select a
site.
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