摘要:
An array-based ion storage system and method are disclosed. The system comprises: an ion generation section; and an ion storage section comprising a first end electrode coupled to the ion generation section and formed as having a plurality of holes, a second end electrode formed as having a plurality of holes, an intermediate electrode formed as having a plurality of holes, a first insulator formed in the shape of a ring and sandwiched between the first end electrode and the intermediate electrode to insulate them from each other, and a second insulator formed in the shape of a ring and sandwiched between the intermediate electrode and the second end electrode to insulate them from each other. With the present invention, the ion storage section can be made thinner to facilitate consistency in ion extraction and reduce the spread of ion mobility spectrum peak. In addition, the first and second insulators each have a big hole, and thus the ions cannot bump onto the insulation material at both sides at the time of ion vibration or thermal movement in the storage space. Therefore, charge transfer and accumulation at the insulator and the subsequent discharge will not occur, suppressing instability of storage and loss of ions.
摘要:
Disclosed is an ion gate for a dual IMS and method. The ion gate includes an ion source, a first gate electrode placed on one side of the ion source, a second gate electrode placed on the other side of the ion source, a third gate electrode placed on the side of the first gate electrode away from the ion source, a fourth gate electrode placed on the side of the second gate electrode away from the ion source, wherein during the ion storage, the potential at the position on the tube axis of the ion gate corresponding to the first gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the third gate electrode, and the potential at the position on the tube axis corresponding to the second gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the fourth gate electrode. According to the present invention, after sample gas enters the ion gates, charge exchange with reaction ions occurs between the first gate electrode and the second electrode, and positive and negative ions are continuously stored into the storage regions for the positive and negative ions. This leads to an improvement of utility rate of ions. Then, the ions are educed in a step-wise manner from the storage regions for the positive and negative ions by a simple control of a combination of the electrodes.
摘要:
Disclosed is an ion source comprising a plate-shaped source body which has radioactivity on its both sides and allows positive and negative ions to penetrate through the source body. The present invention gives beneficial effects. First, the ion source structure can improve the ionization efficiency of sample molecules, and the generated sample ions have a centralized distribution within a flat space on both sides of the source body. Such distribution of ion cloud facilitates to improve the IMS sensitivity. Meanwhile, the source body of the present invention has a transmittance in itself. Thus, positive and negative ions generated on both sides of the source body can penetrate through the source body and be separated to the both sides of the source body. In this way, it is possible to improve the utilization efficiency of ions.
摘要:
Disclosed is a detector array comprising a first linear array for detecting a first ray and a second ray which penetrate through a first plurality of parts of the inspected object to acquire first values and second values for the first plurality of parts, wherein the second ray is alternately emitted with the first ray; and a second linear array arranged parallel to the first linear array for detecting the first ray and the second ray which penetrate through a second plurality of parts of the inspected object to acquire third values and fourth values for the second plurality of parts, wherein the first plurality of parts is partly identical to the second plurality of parts. With the detector array, the efficiency and material discrimination accuracy can be improved in the scanning inspection of the inspected object by use of alternate dual-energy rays.
摘要:
Disclosed is a detector array comprising a first linear array for detecting a first ray and a second ray which penetrate through a first plurality of parts of the inspected object to acquire first values and second values for the first plurality of parts, wherein the second ray is alternately emitted with the first ray; and a second linear array arranged parallel to the first linear array for detecting the first ray and the second ray which penetrate through a second plurality of parts of the inspected object to acquire third values and fourth values for the second plurality of parts, wherein the first plurality of parts is partly identical to the second plurality of parts. With the detector array, the efficiency and material discrimination accuracy can be improved in the scanning inspection of the inspected object by use of alternate dual-energy rays.
摘要:
A method and system for detecting special nuclear materials are disclosed. Said method and system detect the special nuclear materials by making use of the photofission characteristic and thermal neutron induced fission characteristic thereof. In one preferred embodiment, the high density and/or high atomic number region in the object to be detected is also detected first as a suspicious region.
摘要:
A method and system for detecting special nuclear materials are disclosed. Said method and system detect the special nuclear materials by making use of the photofission characteristic and thermal neutron induced fission characteristic thereof. In one preferred embodiment, the high density and/or high atomic number region in the object to be detected is also detected first as a suspicious region.
摘要:
A method for conducting irradiation of all logs of a whole vehicle with X-rays as a phytosanitary treatment may include: connecting a traction device and a goods carrying vehicle outside a shielding door; opening the door; the traction device pulling the vehicle into a tunnel; closing the shielding door; upon the vehicle reaching an irradiation region, accelerators generating X-rays; the traction device pulling the vehicle to pass through the irradiation region; stopping the X-rays; opening the door; the traction device pulling the vehicle away from the irradiation treatment tunnel; and disconnecting the traction device from the vehicle. A device may include a shielding structure, a tunnel formed therethrough; a rail along the tunnel; accelerators within the tunnel; and a traction device for pulling a vehicle carrying goods for quarantine treatment, the accelerators symmetrically arranged at both sides of and on the top of an irradiation region in the tunnel.
摘要:
A photoneutron conversion target for generating photoneutrons by directing an x-ray beam at the photoneutron conversion target includes an elongated body having a first end and a second end. When the photoneutron conversion target is in use, the x-ray beam enters the body and propagates in a direction from the first end to the second end. The body of the photoneutron conversion target is shaped such that propagation of the x-ray beam is substantially proportionate to an intensity distribution of the x-ray beam, so that the greater an intensity of x-rays of the x-ray beam, the greater the propagation distance of the x-rays within the body of the photoneutron conversion target. The photoneutron conversion target according to the invention can make full use of the x-ray beam so as to increase a yield of photoneutrons.
摘要:
The present invention discloses a mobile cantilever door-type container inspection system, in the art of radiation scanning imaging inspection technology. The system according to the present invention comprises a moveable scanning apparatus formed by a scanning frame and a remote control device, wherein the scanning frame comprises a radiation source and some detectors, wherein the radiation source or an apparatus cabin wherein the radiation source is disposed is connected with an L-shaped cantilever structure to form a door-type scanning frame, wherein beneath the radiation source or the apparatus cabin wherein the radiation source is disposed are provided with rollers that can reciprocatingly move on rails and are controlled by drive means. The detectors are disposed in a cross beam and a vertical beam of the cantilever structure of the door-type scanning frame. Rays of the radiation source are right in alignment with rows of detectors in the cantilever structure. The container truck to be inspected can pass through the door-like frame formed by the door-type scanning frame. Due to the cantilever structure, the inspection system is advantageous in stable operation, good-quality images, and high reliability.