B-1
Appendix B. 24 hour K and Tl Counts
used for Site Evaluation
TABLE B-1. Potassium Count (Cnt Tl) Guideline for SWE – 24 hour
Reading
With
Collimator
Without
Collimator
Description
< 96000
144000
Insufficient K at site
96000 to
180000
144000 to
270000
Usable Cnt K range. May experience
larger errors for higher SWE values
180000 to
264000
270000 to
396000
Good Cnt K range. Should maintain
specified operating characteristics
> 264000
> 396000
Excellent Cnt K range
TABLE B-2. Thallium Count (Cnt Tl) Guideline for SWE – 24 hour
Reading
With
Collimator
Without
Collimator
Description
< 9600
14400
Insufficient Tl at site
9600 to 36000
14400 to 54000
Usable Cnt Tl range. May experience
larger errors for higher SWE values
36000 to
48000
54000 to 72000
Good Cnt Tl range. Should maintain
specified operating characteristics
> 48000
> 72000
Excellent Cnt Tl range
Summary of Contents for CS725
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