CPN Neutron Probe - Repeatability

[Gregg Dill]

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I recently went through the exercise of calculating the "Chi ratio" of the
standard count procedure using the equations in the CPN 503 DR neutron probe
manual and comparing them to the "Chi ratio" displayed on the instrument.  Two
different neutron probes were used and three standard counts were done on each
instrument.  The results were :

Instrument number 706
Automatic             Manual
Chi ratio              Chi ratio
1.07                  1.51
0.98                  1.39
0.88                  1.28

Instrument number 3521
0.97                  1.37
1.23                  1.74
1.01                  1.43

"Automatic Chi ratio" is the reading on the neutron probe display and
"Manual Chi ratio" is the calculated value.

I would be interested in comparing notes to see if my situation is unique.

Gregg Dill

_______________________________________________
>  Gregg Dill, P.Eng.,  Irrigation Specialist
>  Alberta Agriculture, Food and Rural Development
>  Agriculture Center
>  100, 5401 - 1st Avenue South
>  Lethbridge,  Alberta,  Canada   T1J 4V6
>  Telephone +1 403-381-5136        FAX  +1 403-382-4526
>______________________________________________