Neutron target for boron neutron capture therapy
Apparatuses and methods for producing neutrons for applications such as boron neutron capture therapy (BNCT) are described. An apparatus can include a rotary fixture with a coolant inlet and a coolant outlet, and a plurality of neutron-producing segments. Each neutron-producing segment of the plurality of neutron-producing segments is removably coupled to the rotary fixture, and includes a substrate having a coolant channel circuit defined therein and a solid neutron source layer disposed thereon. The coolant channel circuits are in fluid communication with the coolant inlet and the coolant outlet.
1. A method, comprising:
rotating a plurality of wedge-shaped neutron-producing segments forming a circular surface removably coupled to a rotary fixture at a frequency between 100 RPM and 1800 RPM, each of the neutron-producing segments of the plurality of neutron-producing segments including a solid neutron source layer and a substrate, the substrate comprising a coolant channel circuit comprising a plurality of radially-oriented linear channels and a periphery region at an outer circumferential edge of the substrate defined therein, the coolant channel circuit in fluid communication with a coolant inlet and a coolant outlet, wherein the coolant channel circuit is arranged to facilitate coolant to flow from the coolant inlet radially outward through the channels into the periphery region and from the periphery region radially inward through the channels to the coolant outlet;
flowing a coolant through the coolant channel circuits of the plurality of segments; and
directing a proton beam at the solid neutron source material such that the proton beam contacts a surface of each of a sequence of segments of the plurality of segments sequentially as the rotary fixture rotates, to cause the emission of neutrons from the solid neutron source layer.
2. The method of claim 1 , wherein the proton beam has an energy of between 1.88 MeV and 3 MeV.
3. The method of claim 1 , wherein the proton beam has a current of between 10 mA and 100 mA.
4. The method of claim 1 , wherein the proton beam contacts the surfaces of each of the sequence of segments of the plurality of segments with a beam spot size of 10 cm.
5. The method of claim 1 , wherein the frequency is 1,000 RPM.
6. The method of claim 1 , wherein the channels are micro-channels having a cross-sectional dimension of between 0.5 mm and 3 mm.
7. The method of claim 1 , wherein the channels are oriented parallel to a major surface of the solid neutron source layer.
8. The method of claim 1 , wherein a thickness of the solid neutron source layer is between 0.01 mm and 3 mm.
9. The method of claim 1 , wherein the emitted neutrons have an energy between 1 eV and 10 keV.
10. The method of claim 1 , wherein the emitted neutrons have a flux of 1×10 9 n/cm 2 /s.