Beam shaping body for neutron capture therapy

Abstract

The invention belongs to the field of neutron capture therapy, and discloses a beam shaping body for neutron capture therapy. The beam shaping body comprises a beam channel part, a beam shaping part and a beam shielding part; the beam channel part comprises a beam inlet, a target material and a beam outlet, the beam shaping part comprises a beam retardance body and a reflection body, and the beamshielding part comprises a radiation shielding body and an outlet shielding body. According to the beam shaping body, the outlet shielding body is arranged at the beam outlet so that useless or harmful rays emitted from the beam outlet during the therapy can be reduced to the greatest degree under the conduction that the influence on the mass of a neutron beam is as small as possible, and the damage caused by non-therapeutic rays to patients during the therapy is reduced; meanwhile, the inner surface of the reflection body is provided with a parabolic curved surface, the direction of the neutron beam can be controlled to make the neutron beam parallelly emitted from the beam outlet in a direction required by the therapy as much as possible, the intensity of the therapeutic beam at the beamoutlet can be improved, and the therapy effect and safety are improved.

Description

technical field [0001] The invention relates to the field of neutron capture therapy, in particular to a beam shaper for neutron capture therapy. Background technique [0002] Neutron capture therapy combines the characteristics of chemotherapy and radiation therapy. The concept of target therapy in chemotherapy is used in radiation therapy. As an effective means of treating cancer, its application has gradually increased in recent years. Among them, boron neutron capture therapy is the most common, which provides a better cancer treatment option than traditional radiation through the specific accumulation of boron-containing drugs in tumor cells and precise neutron beam adjustment. Since the ideal neutron source for boron neutron capture therapy is epithermal neutrons at the keV energy level, neutrons for boron neutron capture therapy can be supplied by nuclear reactors or accelerators. In order to generate a sufficient neutron flux, a higher energy proton is usually selec...

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Problems solved by technology

[0003] The neutron beam shaper is the neutron beam generating part in boron neutron capture therapy, which is usually connected with the accelerator and used in boron neutron capture therapy. The existing neutron beam shaper has different risks: on the one hand, neutron The beam exit is open, and there is a risk of harmful rays leaking from the neutron beam exit. At the same time, harmful chemical substances produced during the nuclear reaction may overflow from the exit. During treatment, patients may be exposed to harmful rays from the neutron beam exit. and harmful chemical substances, causing harm to patients being treated; on the other hand, the reflector only guides neutrons back to the axis, but does not adjust and control the direction of neutron rays, causing the direction of neutron rays to diverge too much, resulting in The directionality of the neutron beam emitted from the exit is not good

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