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Filter and neutron beam source

A technology of neutron beam and neutron, applied in the field of neutron beam source

Active Publication Date: 2015-04-29
HERON NEUTRON MEDICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second layer is located between the first layer and the third layer

Method used

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  • Filter and neutron beam source
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  • Filter and neutron beam source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take the first layer, the second layer, and the third layer of different thicknesses to form a circular cross-section (radius 50cm) screen. The epithermal neutron flux rate, fast neutron dose rate, and fast neutron dose accompanying each epithermal neutron produced by the neutron beam source containing the above filter screen are shown in Table 1:

[0039] Form 1

[0040]

[0041] From the comparison in Table 1, it can be seen that the aluminum atomic weight in the second layer is too large to effectively reduce the speed of fast neutrons, so it is necessary to increase the thickness of the second layer to reduce the dose of fast neutrons, but increasing the thickness of the second layer will also Reduced epithermal neutron flux rate. The smaller atomic weight of magnesium in the third layer can effectively reduce the speed of fast neutrons, but it also reduces the flux rate of epithermal neutrons. When the total thickness (embodiment 1-1) of the first layer and th...

Embodiment 2

[0043] Embodiment 2-1 is similar to Embodiment 1-5, the difference is that the second layer and the third layer are reversed. Although the epithermal neutron flux rate of Example 2-1 is higher, its fast neutron dose rate is also increased accordingly. In order to reduce the fast neutron dose rate in Example 2-1, it is necessary to increase the thickness of the third layer as in Example 2-2. However, although the fast neutron dose rate of embodiment 2-2 is close to the fast neutron dose of embodiment 1-5, its epithermal neutron flux rate is thus reduced. As can be seen from the above, the arrangement order of the first layer, the second layer, and the third layer in Embodiment 1-5 is better than that of the first layer, the third layer, and the second layer in Embodiment 2-1 and 2-2. Order.

[0044] Form 2

[0045]

Embodiment 3

[0047] The thickness of the first layer is fixed at 30cm, and the second and third layers of different thicknesses are used to form a circular cross-section (50cm radius) filter screen, and Y-W H.Liu, T.T.Huang, S.H.Jiang, H.M.Liu are further matched , (2004) "Renovation of Epithermal Neutron Beam for BNCT at THOR," Appl. Radiat. Isot. 61, 1039-1043. Disclosed converging elements. The epithermal neutron flux rate, fast neutron dose rate, and fast neutron dose accompanying each epithermal neutron produced by the neutron beam source containing the above-mentioned filter screen and converging elements are shown in Table 3:

[0048] Form 3

[0049]

[0050] From the comparison of Table 3 with Table 1 and Table 2, it can be known that the converging element can maintain the intensity of the epithermal neutron flux rate and reduce the fast neutron dose rate.

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Abstract

Disclosed is a filter including a second layer disposed between a first layer and a third layer. The first layer is composed of iron. The second layer is composed of 1 part by volume of lithium fluoride, 20 to 50 parts by volume of aluminum, and 50 to 80 parts by volume of aluminum fluoride. The third layer is composed of 1 part by weight of lithium fluoride and 99 to 100 parts by weight of magnesium fluoride.

Description

technical field [0001] The present invention relates to a neutron beam source, and more particularly to a filter screen structure for generating neutron beams. Background technique [0002] The principle of boron neutron capture therapy (BNCT) is as follows: boron-containing drugs are combined with tumor cells through blood circulation, and then irradiated with a neutron beam centered on the position of the tumor tissue, so that boron absorbs neutrons and generates lithium and helium ions, accurately Destroy cancer cells without destroying other normal tissues. [0003] For patients, BNCT causes only minimal damage and does not require surgery and anesthesia. In the treatment of brain tumors, if BNCT uses thermal neutrons with low penetrating power, it is necessary to open the patient's skull; if BNCT uses epithermal neutrons, it is not necessary to open the patient's skull. [0004] At present, most of the neutron beam sources of BNCT are derived from atomic furnaces for ...

Claims

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Application Information

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IPC IPC(8): G21G4/02A61N5/10
CPCA61N5/1077A61N2005/109A61N2005/1095G21G4/02G21K1/10
Inventor 薛燕婉游镇帆
Owner HERON NEUTRON MEDICAL CORP
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