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Dose rate meters (x-ray meters) DP-5A, DP-5B and DP-5V have been produced since 1964 and are an upgrade of the model DP-5. All devices are dosimetric devices for measuring radiation levels (radiation dose rate) and radioactive contamination of objects from gamma radiation. All the technical characteristics and differences of devices from each other are widely described on the Internet. Authorship of photographs of devices is noted on them, below on the left.