INDEXER TRIGGER
SAFE POSITION
(Use for Storage and Standard Counts)
BACKSCATTER POSITION
50 mm
(2 in)
300 mm
(12 in)
INDEX RODSOURCE ROD
DIRECT TRANSMISSION
POSITIONS
Figure 2–1. 3440-L Gauge Showing Rod Positions
Place the gauge on the reference standard block as shown in Figure 2–2,
making sure the block top and gauge base are clean and smooth, with no
soil or other material to prevent good surface-to-surface contact. The gauge
must be positioned between the raised edges of the block and with the right
side of the gauge firmly seated against the metal butt plate on the block.
2–14
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