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Why the near field radiation from a large distributed source is independent of position
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Image of Fig. 1.
Fig. 1.

Counts detected as a function of height above the dirt for a gamma system suspended from the branch of a large tree.

Image of Fig. 2.
Fig. 2.

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.

Image of Fig. 3.
Fig. 3.

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.


Generic image for table
Table I.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Why the near field radiation from a large distributed source is independent of position