1. Overhoff & Associates, Inc. “Technical Manual - Tritium Monitor Betatec”, Cincinnati, Ohio.
2. Scintrex Limited, “Operating and Maintenance Manual for Tritium Monitor Model 275B”, Concord, Ontario, Canada (1987).
3. Scintrex Limited, “Portable Tritium-in-Air Monitor Model 209 Technical Manual”, Concord, Ontario, Canada (1983).