Study on the final response time of the AT1123 X∼γ ray dose detector

Objective: To determine the final response time (FRT) of the AT1123 X-γ ray dose detector and to evaluate its applicability on radiological protection detection of the medical diagnostic X-ray photography room. Methods: The medical diagnostic X-ray camera was set on fixed tube voltages and tube currents, exposure time increased from 10 ms to 1000 ms, AT1123 X-γ ray dose detector was used co measure the dose rate at different exposure time. FRT was defined as the shortest time when the dose rate readings stabilized to the maximum value. Results: AT1123 X-γ ray dose detector was tested under 4 kinds of radiation intensity of X-ray. When exposure time increased to 100 ms, the readings were over 93% of the final value. When exposure time increased to 250 ms, the final value could be fully displayed. Conclusion: FRT of AT1123 X-γ ray dose detector is about 200∼250 ms, suitable for the radiation protection detection of the medical diagnostic X-ray radiography room. (authors)