# Source detection at 100 meter standoff with a time-encoded imaging system

## TL;DR

This paper introduces a time-encoded imaging system capable of detecting radiological sources at 100 meters with high efficiency, demonstrating rapid detection times at closer distances for security and safety applications.

## Contribution

The paper presents a novel radiological detection system based on time-encoded imaging, achieving rapid and efficient source detection at significant standoff distances.

## Key findings

- Detects ~1 mCi Cf-252 source at 100 m with 90% efficiency
- Achieves detection in 15 seconds at 40 m
- Detects in 1.2 seconds at 20 m

## Abstract

We present the design, characterization, and testing of a laboratory prototype radiological search and localization system. The system, based on time-encoded imaging, uses the attenuation signature of neutrons in time, induced by the geometrical layout and motion of the system. We have demonstrated the ability to detect a ~1 mCi Cf-252 radiological source at 100 m standoff with 90% detection efficiency and 10% false positives against background in 12 min. This same detection efficiency is met at 15 s for a 40 m standoff, and 1.2 s for a 20 m standoff.