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We present a technology for diagnosing the D-T fusion process by detecting capture γ-rays. This technologyprovides an alteative route to diagnosing the D-T reaction process when a great deal of heavy Z materials surroundsthe D-T region. A very important aspect of this paper is to focus on the methods of shielding low-energy γ-rays whoseradiation intensity is 106 times higher than that of the capture γ-rays. Another aspect is about how to distinguishsignal from noise. The result of a 50/1 signal-to-noise ratio indicates that the designed double-magnetic spectrographis very successful for diagnosing the D-T fusion reaction process.