1) 22. Calculate the air-gap ratio by dividing the counts per minute obtained in the air-gap position by the counts per minute obtained in the standard position

2) 18. The depth of the maximum void beneath the gauge shall not exceed

3) 4. This method is used for the Shellow depths up to

4) 6. Nuclear Density / Moisture Gauge Consist of

5) 21. Procedure B The Backscatter or Backscatter/ Air-Gap Ratio Procedure Set the gauge into the........... Position

6) 3. Total or wet density of soil and soil - aggregate is measured by the attenuation of

7) 19. In ASTM D 6938 for the Procedure A The Direct transmission Procedure Select a test locaiton where the gauge in test position will be at least.................... away from any vertical projection.

8)

1. In ASTM D-6938 uses the Nuclear gauge to find the....................of Soil and Soil aggregates

9) 8. Perform the standardization with the gauge located at least...........away from other nuclear moisture density gauges.

10) 10. Procedure A describes the........... method in which the probe cxiends through the base of the gauge into a pre-formed hole to a desired depth

11) 14. In ASTM D -6938 Measurements may be affected by non-homogeneous soils and surface texture

12) 9. Maximum laboratory density value in.............

13) 17. In ASTM D-6938, When possible, select a test location where the gauge will be placed at least.....................away from any object sitting on or projecting above the surface of the test location,

14) 7. Standardization of the gauge shall be performed at the start of...........

15) 5. The test method described is usefull as a rapid, nondestructive technique for in-place measurements of wet density and water content of soil and soil-aggregate and the determination of dry density

16) 15. Other radioactive sources must not be within 9 m ( 30 ft) of equipment in operation.

17) 12. The test method is used for quality control and acceptance testing of compacted soil and soil-aggregate mixt

18) 2. ASTM D 6938 is used for the.................

19) 20. The hole should be a minimum of ................deeper than the desired measurement depth and of an alignment that insertion of the probe will not cause the gauge to tilt from the plane of the prepared area

20) 13. Water Content in the soil or soil-aggregate is found by fundamental that the............present

21) 11. Procedure B involves the use of a dedicated...................or the probe in the backscatter position

22) 16. If for any reason the measured density or moisture becomes suspect during the day's use, perform another standardization check.