Dynacap for DC modulation

Abstract

The invention discloses a dynacap for DC modulation. A vibration electrode in the dynacap can vibrate freely, when a periodic current is loaded on an enamelled coil, an alternating magnetic field is generated in the center of the enamelled coil, the vibration electrode of the dynacap vibrates periodically in the alternating magnetic field, and the capacitance of the dynacap changes periodically. When certain amount of charge is loaded on the dynacap, the output end of the dynacap obtains a frequency and amplitude stable AC current signal. The charger can be generated by current output by a current type detector. The amplitude of the AC voltage signal output by the dynacap is proportional to the current output by the detector. The dynacap used for DC modulation is mounted in an output modulation module of the current type detector, is suitable for DC modulation in the wide range of 10-5A to 10-13A, and can measure the DC output by a tritium measuring ionization chamber in the special radiation environment.

Description

Technical field [0001] The invention belongs to the field of radiation detection technology and radiation protection, and in particular relates to a dynamic capacitor used for output current modulation of a current type detector. Background technique [0002] In the process of laser fusion shooting, the target pellet is heated by the laser and vaporized instantly. The deuterium and tritium gas is quickly released into the target chamber. Tritium is a beta radionuclide with a half-life of 13.33 years. The maximum energy of the beta rays emitted by the decay is 18.6keV, the average The energy is about 5.9keV. Tritium can penetrate into the human body through respiration, diet and skin, so that human tissues are exposed to internal radiation. Therefore, the tritium concentration must be monitored in real time during the maintenance of the target chamber to ensure the radiation safety of personnel. [0003] The beta particles of tritium have low energy and weak penetrating ability. T...

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Problems solved by technology

[0004] At present, the measurement of the output current of the ionization chamber is mainly realized by the pre-stage current sense amplifier made of high-performance operational amplifier chip, but in the strong radiation environment of deuterium-tritium fusion, the high-sensitivity chip is vulnerable to radiation damage and the current measurement system fails.

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