Figure 9: Experimental layout for the remote detection of a radioactive source. | Nature Communications

Figure 9: Experimental layout for the remote detection of a radioactive source.

From: Remote detection of radioactive material using high-power pulsed electromagnetic radiation

Figure 9

(a) The setup consists of a millimetre-wave power source, a gyrotron, a spherical focusing mirror 42 cm from the gyrotron window to focus the beam inside the vacuum chamber, an RF detector 60 cm from the centre of the vacuum chamber, a photodiode, and a 0.64 mCi sample of 60Co as the radioactive source. The EM wave propagates from the gyrotron window and is focused at a small spot inside the vacuum chamber, as indicated in red. At the focal point, the electric field is polarized in the x-direction and propagates in the k-direction, as defined in the figure. The formed plasma travels in the k-direction. (b) Typical oscilloscope signals (voltage, current, RF detector and photodiode signals). The gyrotron is operated at a voltage and current of 40 kV and of 7 A, respectively.

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