DA Form 5449-R: Nuclear Moisture Density Tester Log (LRA) – DA Form 5449-R: Moisture and Density Tester (Nuclear Method) Utilization Log (LRA) is a U.S. Army form used to document the operation and standard counts of nuclear density/moisture gauges (also called nuclear soil testers) in construction and engineering projects.
These gauges employ sealed radioactive sources (typically Cesium-137 for density and Americium-241/Beryllium for moisture) to measure soil, asphalt, and other material compaction non-destructively—critical for quality control in military construction, road building, airfield paving, and earthwork.
What Is DA Form 5449-R Used For?
The form serves as a utilization log (LRA = Locally Reproducible Artwork) to record daily standard counts and equipment usage. It helps verify gauge performance, ensure compliance with radiation safety protocols, and maintain accurate calibration records.
Key purposes include:
- Tracking standard counts (reference measurements taken before field tests) to confirm the device operates within acceptable statistical limits (e.g., normal deviation checks using ±√average rules).
- Documenting operator usage, dates, times, locations, and maintenance-related activities.
- Supporting radiation safety oversight by the Local Radiation Protection Officer (LRPO).
- Providing an auditable record for regulatory compliance, troubleshooting erratic readings, and equipment accountability.
It pairs with related forms like DA Form 5448-R (Field Data Worksheet) and DA Form 5450-R (Field Test Sheet) for full test documentation.
Why It Matters in U.S. Army Construction?
Nuclear gauges provide rapid, accurate in-situ density and moisture data, enabling real-time decisions on compaction (e.g., achieving 95%+ of maximum dry density per specs). This is vital for infrastructure durability under heavy loads, such as runways, roads, and embankments.
Proper logging on DA Form 5449-R ensures:
- Safety — Monitors exposure and detects issues like source leakage (e.g., wipe tests showing >0.1 mrem/hr trigger withdrawal).
- Accuracy — Verifies gauge stability; poor standard counts may indicate problems requiring service.
- Compliance — Aligns with TM 5-6635-386-12&P (for models like Campbell Pacific MC-1) and Army radiation protection rules (AR 385-11). Only trained, badge-wearing operators under LRPO supervision may use them. Pregnant personnel are prohibited.
Note: These devices contain radioactive materials, so strict handling, storage, transportation, and disposal rules apply. Unauthorized use or improper logging can lead to safety violations or project delays.
How to Use and Fill DA Form 5449-R?
Refer to the Technical Manual (e.g., TM 5-6635-386-12&P) for exact procedures. Typical entries include:
- Date and operator name/badge info.
- Standard count readings (density and moisture) before and after use.
- Comparison to historical averages and statistical checks.
- Project/site details, gauge serial number, and any remarks (e.g., anomalies or maintenance).
The form is designed for local reproduction and is often included in the back of relevant TMs.
Download Link: [Official or authorized DA Form 5449-R PDF] (provided by user; ensure you obtain the latest version from official Army sources like APD or unit supply for fillable/reproducible formats).
Best Practices for U.S. Users (Contractors, Engineers, and Army Personnel)
- Perform standard counts daily and log them consistently.
- Train operators per NRC/Agreement State licensing and Army requirements.
- Store gauges securely in approved cases with sources in the “safe” position.
- Maintain supporting records for audits or inspections.
- For civilian contractors on Army projects, coordinate with the COR or safety officer for gauge licensing and form usage.
This form supports efficient, safe, and compliant operations in U.S. military engineering. For the most current guidance, consult official Army publications, your LRPO, or the latest TM for your specific gauge model. Always prioritize radiation safety—distance, time, and shielding are key.