Counts detected as a function of height above the dirt for a gamma system suspended from the branch of a large tree.
Spherical coordinate geometry applied to a detector at height above the surface of a plane. The material below the plane is characterized by an absorption coefficient and strength of emission of ionizing radiation . Here is the gamma path length in the material.
A detector close to the surface receives radiation shown by the denser array of shallow lines. The same detector at a higher position may receive events from a structure in the floor that was hidden to the lower detector. Here the counts could increase with detector height.
Gamma emission from a dirt field as a function of height. Note that 13 of the 16 data points lie within the mean the square root of the mean given in the text.
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