A mobile d-t neutron generator for marking neutron beam non-destructive testing

Abstract

The invention belongs to the technical field of marking neutron beam non-destructive testing, in particular to a mobile D-T neutron generator for marking neutron beam non-destructive testing, comprising a high-frequency ion source system ( 5) and the vacuum system and the measurement unit (7), the associated beam target system (8) arranged on the vacuum system and the measurement unit (7), the D+ ion beam generated and drawn by the high-frequency ion source system (5) passes through the accelerated The tube (6) accelerates and bombards the tritium target (68) in the associated beam target system (8), and produces 14 MeV neutrons through the D-T reaction, and the associated beam target system (8) simultaneously monitors the generation time and position of the neutrons. The measurement realizes the calibration of the emission time and direction of the neutrons; it also includes a control system for controlling the high-frequency ion source system (5) and the accelerating tube (6). The present invention is a portable D-T neutron generator applicable to correlative beam neutronography applications.

Description

technical field [0001] The invention belongs to the technical field of marking neutron beam non-destructive testing, in particular to a mobile D-T neutron generator for marking neutron beam non-destructive testing. Background technique [0002] The fast neutron generator is an accelerator neutron source that uses deuterium-deuterium (D-D) and deuterium-tritium (D-T) fusion reactions to produce monoenergetic neutrons. It uses low-energy D+ ion beams (energy less than 400keV) to bombard deuterium-titanium targets (DTi) or Tritium-titanium target (TTi) can be used to generate 2.5MeV or 14MeV monoenergetic neutrons, which can be widely used in nuclear data measurement, reactor material shielding experiments, neutron detector calibration, fast neutron non-destructive testing and other fields. [0003] At present, neutron generators are mainly divided into three categories. One is to use a high-voltage doubler to accelerate D+ ions of several mA to tens of mA to 300-400keV and the...

AI Technical Summary

Problems solved by technology

This type of neutron generator has a large volume and is not suitable for a small environment

In addition, due to the large target point at high beam currents, it is not conducive to the application of correlated beam neutron detection experiments.

The second type is a small sealed neutron tube. Its working method is to accelerate the D+ ion beam of a smaller beam to about 100keV, and bombard the deuterium-titanium target (DTi) or tritium-titanium target (TTi) target to produce neutrons. The D-D The neutron yield of the reaction is generally greater than 10 7 n / s, D-T reaction neutron yield is generally not greater than 10 9 n / s, this type of neutron generator is small in size and has few ancillary equipment, but because the target material is in a sealed state, it cannot be reused after the target material is exhausted, the life is short, the cost is high, and the output is difficult to further increase

However, if the target is at a high potential, a liquid with high resistivity must be used for cooling. The Chinese patent (CN105407621A) mentions cooling with pure water with a resistivity of 20kΩ, but the water purification equipment is complicated and the flow rate is slow, so the cooling effect is limited.

The target is at a high potential, and the associated α detector is installed near the target, which is likely to cause ignition and high-voltage discharge interference, and the application of associated beam neutron nondestructive testing has not yet been realized

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