These test methods cover the determination of the total or wet density of soil and soil-rock mixtures by the attenuation of gamma radiation where the source and detector s remain on the surface Backscatter Method or the source or detector is placed at a known depth up to mm 12 in. The inch-pound equivalents may be approximate. This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. These test methods have been written using the gravitational system of units when dealing with the inch-pound system.
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Designation: D — Standard Test Methods for. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. The inch-pound equivalents may be approximate. This implicitly combines two separate systems of units; that is, the absolute system and the gravita- tional system.
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