List of Radon Graphs

These graphs where generated with in house built scintillation type continuous radon monitors. The CRM's consist of Ludlum model 182 flask counters that are lined with zinc sulfide phosphor film to form a one liter flow through scintillation cell. The photo multiplier is connected to a Ludlum model 2000 scaler and model 264 printer. Sigma Plot software is used to plot the data. The CRM's typically have about 30 to 70 counts per hour background and record about 200 to 230 counts per hour per pCi/L when the air density is 585 mm Hg.

Most of these tests where done in conjunction with a real estate transaction. All graphs are less than (15K).

Feel free to download any of these radon graphs.

1. 3.2 pCi/L graph Normal repeating diurnal curve
2. 30 pCi/L graph Ventilation at end of test
3. 7.9 pCi/L graph and 0.9 pci/L after mitigation
4. 3.8 pCi/L graph House ventilated
5. 144 pCi/L graph and 4.3 pCi/L after mitigation
6. 108+pCi/L graph Build up and Ventilation
7. 102 pCi/L graph School room
8. 900 pCi/L graph in Bedroom air from radon in well water
9. 2.0 pCi/L graph in bedroom directly below 900 pCi/L bedroom
10. 1.8 pCi/L graph with heat on; 4.9 pCi/L in the summer
11. 2.2 to 8.1 pCi/L graph depending on bedroom door being open or closed.
12. 0.37 pCi/L graph week of outside air
13. Comparing 1 hour measurements to 48 hour CRM averages graph
14. 5 pCi/L to 90 pCi/L Unusually high spikes.
15. The closed house instructions we give to the occupants.

Tom Martin (303) 674-4620
gtmartin@discoverit.com
Evergreen, Colorado USA

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This was created on 1/21/95 and last modified on 3/2/98
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