DEVELOPMENT OF A TIME MEASUREMENT SYSTEM FOR USE WITHIN INFORMATION BARRIERS

We report on the development of a subsystem that, when used with an Attribute Measurement System (AMS), can determine the current date without batteries, continuous electrical connection, or user input. The device will allow the system to determine the current date from the decay of a small radioactive source without complication of the information barrier, system authentication, or security. This subsystem may be used when an AMS needs to compare a calculated age with a reference date independently and without external input. The requirements, design, and other aspects of the time measurement subsystem will be discussed.