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 2, September 2024

• Nuclear Gauge Testing Manual Edition 4, Amendment 2, September 2024

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Superseded versions of the manual are available on the Nuclear Gauge Testing Manual - Superseded page.

 Notifications and feedback

Subscribe to receive email alerts about NGTM updates. If you have an existing subscription, you can update your email preferences OR unsubscribe, should you no longer wish to receive emails.

For feedback or enquires about NGTM, please email Technical Publications.