Nuclear gauge testing manual

The Nuclear Gauge Testing Manual (NGTM) provides procedures and instructions for the safe use and operation of nuclear gauges to measure the compacted density of soils, crushed rock and asphalt materials.

Additionally, the determination of material biases (moisture content and wet density) is detailed for Troxler, InstroTek, Humboldt and Campbell-Pacific Nuclear (CPN) gauges.

Edition 4, Amendment 1, October 2023

• Nuclear Gauge Testing Manual Edition 4, Amendment 1, October 2023

The verification data for this manual is available on the Verification Data page.

Updates, withdrawals, new test methods or operational checks are recorded in the amendment register.

Superseded versions of the manual are available on the Nuclear Gauge Testing Manual - Superseded page.

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