التفاصيل البيبلوغرافية
| العنوان: |
SHIELDING FOR COMPACT RADIATION SOURCES |
| Document Number: |
20110198516 |
| تاريخ النشر: |
August 18, 2011 |
| Appl. No: |
12/681019 |
| Application Filed: |
October 01, 2008 |
| مستخلص: |
Disclosed are radiation shields substantially enclosing a source of polyenergetic positive ions. The shielding layers are spatially arranged to absorb substantially all unwanted radiation arising directly or indirectly from the polyenergetic positive Also disclosed are methods of shielding unwanted radiation leaking from a system providing a therapeutic dose of polyenergetic positive radiation, as well as shielded polyenergetic positive ion selection systems. |
| Inventors: |
Fan, Jiajin (Philadelphia, PA, US); Ma, Chang Ming (Huntington Valley, PA, US) |
| Assignees: |
Fox Chase Cancer Center (Jenkintown, PA, US) |
| Claim: |
1. A radiation shield substantially enclosing a source of polyenergetic positive ions, comprising: one or more electron shielding layers; one or more low energy proton shielding layers; one or more high energy proton shielding layers; and wherein said shielding layers are spatially arranged to absorb substantially all unwanted radiation arising directly or indirectly from the polyenergetic positive ions. |
| Claim: |
2. The radiation shield of claim 1, further comprising secondary particle shielding layers. |
| Claim: |
3. The radiation shield of claim 2, wherein the secondary particle shielding layers comprise one or more low energy neutron shielding layers, one or more high energy neutron shielding layers, one or more high energy photon shielding layers, or any combination thereof |
| Claim: |
4. The radiation shield of claim 1, wherein at least a portion of the one or more low energy neutron shielding layers is disposed closer than the one or more high energy photon shielding layers to the polyenergetic positive ion source. |
| Claim: |
5. The radiation shield of claim 1, wherein at least a portion of the one or more low energy proton shielding layers is disposed on the interior of the radiation shield in the direction of deflection of the low energy positive ions. |
| Claim: |
6. The radiation shield of claim 1, wherein the one or more electron shielding layers comprises tungsten, or a similar material, member between about 2 cm and about 7 cm thick. |
| Claim: |
7. The radiation shield of claim 1, wherein the one or more low energy neutron shielding layers comprise low density, hydrogen-rich materials. |
| Claim: |
8. The radiation shield of claim 7 wherein the low density, hydrogen-rich materials comprise boronated polyethylene, polyethylene, polystyrene, PMMA, plastic materials, or any combination thereof. |
| Claim: |
9. The radiation shield of claim 1, wherein one or more of the electron shielding layers, the low energy proton shielding layers, or the high energy proton shielding layers comprises concrete. |
| Claim: |
10. The radiation shield of claim 7 wherein the one or more low energy neutron shielding layers comprise a layer between about 5 cm and about 20 cm thick. |
| Claim: |
11. The radiation shield of claim 7 wherein the low energy neutrons are characterized as having energy in the range of from about 0.025 eV to about 5 MeV. |
| Claim: |
12. The radiation shield of claim 1, wherein the one or more high energy neutron shielding layers comprise tungsten, steel, copper, lead, or any combination thereof. |
| Claim: |
13. The radiation shield of claim 12, wherein the one or more high energy neutron shielding layers comprise materials that have similar neutron inelastic scattering cross sections to tungsten, lead, copper, steel, or any combination thereof. |
| Claim: |
14. The radiation shield of claim 12 wherein the one or more high energy neutron shielding layers comprise a layer between about 5 cm and about 20 cm thick. |
| Claim: |
15. The radiation shield of claim 12 wherein the high energy neutrons are characterized as having at least one energy in the range of from about 5 MeV to about 350 MeV. |
| Claim: |
16. The radiation shield of claim 1, wherein the one or more low energy proton shielding layers comprise steel, tungsten, copper, zinc, lead, other high density materials, or any combination thereof. |
| Claim: |
17. The radiation shield of claim 16, wherein the high density materials comprise materials that have a density above about 10 g/cm3. |
| Claim: |
18. The radiation shield of claim 16 wherein the one or more low energy proton shielding layers comprise a layer between about 0.2 cm and about 5 cm thick. |
| Claim: |
19. The radiation shield of claim 16 wherein the low energy protons are characterized as having at least one energy less than about 50 MeV. |
| Claim: |
20. The radiation shield of claim 1, wherein the one or more high energy photon shielding layers comprise steel, tungsten, copper, zinc, lead, the other high density materials, or any combination thereof. |
| Claim: |
21. The radiation shield of claim 20, wherein the one or more high energy photon shielding layers comprise one or more materials having an atomic number greater than about 26. |
| Claim: |
22. The radiation shield of claim 20, wherein the high energy photons comprise bremsstrahlung photons, gamma rays, or both. |
| Claim: |
23. The radiation shield of claim 20 wherein the one or more high energy photon shielding layers comprise a layer between about 2 cm and about 40 cm thick. |
| Claim: |
24. The radiation shield of claim 20 wherein the high energy photons are characterized as having at least one energy in the range of from about 1 MeV to about 350 MeV. |
| Claim: |
25. The radiation shield of claim 1, further comprising an opening to permit entry of a laser pulse to the source of polyenergetic positive ions, and an opening for permitting polyenergetic positive ions to exit the radiation shield. |
| Claim: |
26. The radiation shield of claim 1, wherein the opening to permit entry of a laser pulse is characterized as having an area from about 1 cm2 to about 1600 cm2. |
| Claim: |
27. The radiation shield of claim 1, wherein the opening for permitting polyenergetic positive ions to exit the radiation shield is characterized as having an area from about 0.01 cm2 to about 1600 cm2. |
| Claim: |
28. The radiation shield of claim 1, wherein at least a portion of the one or more high energy neutron shielding layers and at least a portion of the one or more high energy photon shielding layers are situated proximate to the opening for permitting polyenergetic positive ions to exit the radiation shield. |
| Claim: |
29. The radiation shield of claim 1, wherein the one or more low energy proton shielding layers are situated proximate to the direction of deflection of low energy positive ions. |
| Claim: |
30. The radiation shield of claim 1, wherein the dimensions of the radiation shield are less than about 5 meters long by 5 meters wide by 5 meters high. |
| Claim: |
31. An ion selection system comprising the radiation shield of claim 1. |
| Claim: |
32. A method of shielding unwanted radiation leaking from a system capable of providing a therapeutic dose of polyenergetic positive radiation, the method comprising: stopping or slowing, or both, electrons using one or more electron shielding layers contained within the system; stopping or slowing, or both, low energy protons using one or more low energy proton shielding layers contained within the system; and stopping or slowing, or both, high energy protons using one or more high energy proton shielding layers contained within the system. |
| Claim: |
33. The method of claim 32, further comprising stopping or slowing, or both, secondary particles using one or more secondary particle shielding layer contained within the system. |
| Claim: |
34. The method of claim 32, wherein the secondary particles comprise low energy neutrons, high energy neutrons, high energy photons, or any combination thereof |
| Claim: |
35. The method of claim 32, wherein the unwanted radiation dose leaking from the system is less than about 0.1% of the therapeutic dose adsorbed by a patient. |
| Claim: |
36. A polyenergetic positive ion selection system, comprising: a source of polyenergetic positive ions; and a radiation shield substantially enclosing the source of polyenergetic positive ions, the radiation shield comprising: one or more electron shielding layers; one or more low energy proton shielding layers; and one or more high energy proton shielding layers; wherein said shielding layers are spatially arranged to absorb substantially all unwanted radiation arising directly or indirectly from the polyenergetic positive ions. |
| Claim: |
37. The system of claim 36, further comprising secondary particle shielding layers to absorb substantially all unwanted radiation arising directly or indirectly from the polyenergetic positive ions. |
| Claim: |
38. The system of claim 36, wherein the secondary particles comprise low energy neutrons, high energy neutrons, high energy photons, or any combination thereof. |
| Current U.S. Class: |
2505/181 |
| Current International Class: |
21 |
| رقم الانضمام: |
edspap.20110198516 |
| قاعدة البيانات: |
USPTO Patent Applications |
