# US 9,526,463 B2 · Radiation shielding

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- Number: US 9,526,463 B2
- Document ID: US9526463B2
- Status: Granted
- Kind: B2
- Application number: 15/147,826
- Filed: 2016-05-05
- Published: 2016-11-10
- Granted: 2016-12-27
- Earliest claimed: 2015-05-06
- Assignees: GammaTile LLC
- Applicants: GammaTile LLC
- Inventors: David Brachman; Evan K. Fram; Peter Nakaji
- Web page: https://patentgrep.com/patent/US9526463B2

## CPC

- A61B 6/107: {Protection against radiation, e.g. shielding}
- A61N 5/10: X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy (A61N5/01 takes precedence)
- A61N 5/1001: {using radiation sources introduced into or applied onto the body; brachytherapy}
- G21F 1/00: Shielding characterised by the composition of the materials
- G21F 1/02: Selection of uniform shielding materials
- G21F 1/12: Laminated shielding materials
- G21F 3/00: Shielding characterised by its physical form, e.g. granules, or shape of the material
- A61N 2005/1094: {Shielding, protecting against radiation}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)
- G21F: PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR (radiation protection by pharmaceutical means A61K8/00, A61Q17/04; in cosmonautic vehicles B64G1/54; combined with a reactor G21C11/00; combined with X-ray tubes H01J35/16; combined with X-ray apparatus H05G1/02)

## Abstract

Various configurations of shielding materials within shielding layers, such as for use in shielding radiation from implanted radioactive carriers, are discussed herein.

## Claims

### Claim 1

A shielding apparatus comprising:
a collagen substrate;
a plurality of shielding materials embedded in the collagen substrate, the shielding materials each comprising a high-z material, wherein the shielding materials are positioned within the collagen substrate to match positions of a corresponding plurality of radiation sources arranged according to a dosimetric plan, at least some of the radiation sources arranged with gaps between the at least some of the radiations sources and adjacent of the plurality of radiation sources;
wherein when the apparatus is placed on the plurality of radiation sources,
each of the shielding materials provides substantial shielding of radiation emitted by a corresponding radiation source and reduced shielding of radiation from other of the plurality of radiation sources; and
gaps between respective shielding materials provide less distortion of magnetic energy than the shielding materials.

### Claim 2 (depends on 1)

The shielding apparatus of claim 1, wherein gaps comprise collagen of the collagen substrate between shielding materials.

### Claim 3 (depends on 1)

The shielding apparatus of claim 1, wherein substantial shielding shields more than 80% of radiation.

### Claim 4 (depends on 1)

The shielding apparatus of claim 1, wherein reduced shielding shields less than 50% of radiation.

### Claim 5 (depends on 1)

The shielding apparatus of claim 1, wherein the one or more shielding materials are formed in the shape of rods, cylinders, or spheres.

### Claim 6 (depends on 1)

The shielding apparatus of claim 1, wherein the dosimetric plan indicates x*y radiation sources arranged in x rows and y columns, and the collagen substrate is embedded with x*y shielding materials in x rows and y columns.

### Claim 7 (depends on 6)

The shielding apparatus of claim 6, wherein the dosimetric plan indicates a gap distance between adjacent radiation sources in each of the x rows, and the shielding materials in each of the x rows are spaced apart by the gap distance.

### Claim 8 (depends on 7)

The shielding apparatus of claim 7, wherein the dosimetric plan indicates a second gap distance between adjacent radiation sources in each of the y columns, and the shielding materials in each of the y columns are spaced apart by the second gap distance.

### Claim 9 (depends on 1)

The shielding apparatus of claim 1, wherein the dosimetric plan indicates an irregular arrangement of the plurality of radiation sources, and the shielding materials are positioned in the same irregular arrangement in the collagen substrate.

### Claim 10 (depends on 1)

The shielding apparatus of claim 1, wherein the shielding apparatus is sufficiently malleable to be formed into a substantially hemispherical shape within a corresponding substantially hemispherical cavity.

### Claim 11 (depends on 1)

The shielding apparatus of claim 1, wherein the shielding apparatus is configured for attachment on either side of a substantially hemispherical cavity such that an air-filled void is formed between a bottom of the hemispherical cavity and the formed into a substantially hemispherical shape within a corresponding hemispherical cavity.

### Claim 12 (depends on 1)

The shielding apparatus of claim 1, wherein the collagen substrate is adhered to a bio-compatible material.