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Method and device for object imaging by using photoneutron transmission

A neutron and imaging technology, applied in neutron radiation measurement, measurement device, radiation measurement, etc., can solve the problem of photoneutron transmission image resolution deterioration and other problems, and achieve the effect of solving the reduction of resolution

Active Publication Date: 2019-10-25
NUCTECH CO LTD
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Problems solved by technology

For the aforementioned reasons, such as figure 1 As shown, the resolution of the optical neutron transmission image becomes worse relative to the X-ray transmission image

Method used

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  • Method and device for object imaging by using photoneutron transmission
  • Method and device for object imaging by using photoneutron transmission
  • Method and device for object imaging by using photoneutron transmission

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Embodiment Construction

[0035] Hereinafter, the present invention will be described with reference to the drawings.

[0036] First, the technical premise of the present invention will be described. When the energy of neutrons is not very high (that is, several MeV or lower, the energy of optical neutrons meets this energy range), the elastic scattering of neutrons with protons mainly manifests as S-wave collisions. In the center-of-mass system, the directions of scattered neutrons caused by S-wave collisions are isotropic. Therefore, after one collision, it can basically be considered that neutrons have lost their "memory" of the direction of incidence. Therefore, it can be approximately considered that no matter how neutrons are incident on the surface of a moderator, their scattering process in the moderator is approximately the same. figure 2 is the distribution map of the absorption positions of neutrons incident from different angles in boron-carrying liquid flash. exist figure 2 Three dif...

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Abstract

The invention provides a method and a device for object imaging by using photoneutron transmission. The method comprises the following steps: using a photoneutron source to emit a photoneutron ray andirradiating a checked object; using a detector to receive the photoneutron ray from the photoneutron source; and using the photoneutron ray received by the detector to carrying out imaging on the checked object. The detector is a detector capable of moderating photoneutrons and absorbing photoneutrons, and an angle formed between the incident direction of the photoneutron ray from the photoneutron source and the normal direction of the surface of the detector is in the range of 60 degrees to 87 degrees.

Description

technical field [0001] The invention relates to a transmission imaging technology, in particular to a method and device for imaging an object by using light neutron transmission. Background technique [0002] When using the optical neutron source generated by the linear electron accelerator for transmission imaging, the interference problem of X-ray pulses on the detection of optical neutrons must be solved first, because optical neutrons are the companions of X-rays, and the intensity of the latter is much greater than that of the former (about 4 to 5 orders of magnitude larger), therefore, even if a certain detector is very sensitive to neutrons and quite insensitive to photons, the signal amplitude of the X-ray pulse will still obviously exceed the signal amplitude of the optical neutron pulse, The transmission imaging information obtained at this time mainly comes from the contribution of X-ray pulses rather than the contribution of photoneutrons. [0003] Therefore, in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/05G01N23/09G01T3/02G01T3/06
CPCG01N23/05
Inventor 杨祎罡张勤俭李元景张智
Owner NUCTECH CO LTD
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