# US 8,541,761 B2 · Portable dosimeter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,761 B2 - Document ID: US8541761B2 - Status: Granted - Kind: B2 - Application number: 12/757,147 - Filed: 2010-04-09 - Published: 2011-07-14 - Granted: 2013-09-24 - Earliest claimed: 2010-01-12 - Assignees: Landauer, Inc. - Applicants: R. Craig Yoder; Yoshikazu Tatsumi; Tse-Min Lo; Mark S. Akselrod - Inventors: R. Craig Yoder; Yoshikazu Tatsumi; Tse-Min Lo; Mark S. Akselrod - Web page: https://patentgrep.com/patent/US8541761B2 ## CPC - G01T 1/105: Read-out devices (G01T1/115 takes precedence) - G01T 3/00: Measuring neutron radiation (G01T5/00 takes precedence) - G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00) ## Abstract A radiation dosimeter including one or more optically stimulated luminescence (OSL) sensors. ## Claims ### Claim 1 A device comprising: a radiation dosimeter including one or more optically stimulated luminescence (OSL) sensors; a strap member for wrapping around a portion of a body or a portion of an article of clothing to thereby allow the dosimeter to be worn by an individual, wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) and one or more filters, wherein the dosimeter includes an upper housing and a lower housing and wherein the upper housing is separable from the lower housing, wherein the device comprises a sled that is slidably removable from the lower housing and wherein the sled includes the one or more OSL sensors, wherein the upper housing includes interior screw threads that engage exterior screw threads on the lower housing, and wherein is separable from the lower housing when the upper housing is turned 90° relative to the lower housing from a position in which the lower housing is mounted in the upper housing, and wherein each of the OSL sensors comprises the OSLM mounted in a first cylindrical cup-shaped filter. ### Claim 2 (depends on 1) The device of claim 1, wherein the dosimeter includes two loops on opposite sides of the dosimeter through which the strap member is threaded and which are graspable by an individual to thereby allow the individual to turn the upper housing 90° relative to the lower housing when the lower housing is prevented from rotating. ### Claim 3 (depends on 2) The device of claim 2, wherein the lower housing comprises one or more rotation preventing engagement structures for engaging respective one or more complementary rotation preventing engagement structures of a dosimeter reader to prevent rotation of the lower housing when the lower housing is loaded in the dosimeter reader. ### Claim 4 (depends on 1) The device of claim 1, wherein the first cylindrical cup-shaped filter comprises aluminum. ### Claim 5 (depends on 1) The device of claim 1, wherein a selected one or more OSL sensors of the one or more OSL sensors comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted. ### Claim 6 (depends on 5) The device of claim 5, wherein the first cylindrical cup-shaped filter comprises aluminum and the second cylindrical cup-shaped filter comprises copper. ### Claim 7 (depends on 1) The device of claim 1, wherein the one or more OSL sensors each comprise one or more filter material discs located between the OSLM and a base of the first cylindrical cup-shaped filter. ### Claim 8 (depends on 7) The device of claim 7, wherein a first OSL sensor of the one or more OSL sensors comprises a converter material disc located between the OSLM and the first cylindrical cup-shaped filter. ### Claim 9 (depends on 8) The device of claim 8, wherein the converter material disc comprises high-density polyethylene and wherein there is a conformal disc comprising polyethylene located between the OSLM and the converter material disc. ### Claim 10 (depends on 8) The device of claim 8, wherein a second OSL sensor of the one or more OSL sensors comprises a first reference filter material disc located between the OSLM and the first cylindrical cup-shaped filter. ### Claim 11 (depends on 10) The device of claim 10, wherein the first reference filter material disc comprises polytetrafluorethylene. ### Claim 12 (depends on 11) The device of claim 11, wherein a third OSL sensor of the one or more OSL sensors comprises a second reference filter material disc, wherein the second reference material disc is located between the OSLM and the first filter, and wherein the third OSL sensor is a comparator sensor for the second OSL sensor. ### Claim 13 (depends on 12) The device of claim 12, wherein the second reference filter material disc comprises polytetrafluorethylene. ### Claim 14 (depends on 1) The device of claim 1, wherein the OSLM for each OSL sensor comprises an Al2O3:C material. ### Claim 15 A device comprising: a radiation dosimeter comprising: a dosimeter sled including one or more optically stimulated luminescence (OSL) sensors; an upper housing; and a lower housing, wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) and one or more filters, wherein the upper housing includes interior screw threads that engage exterior screw threads on the lower housing, wherein the upper housing is separable from the lower housing when the upper housing is turned 90° relative to the lower housing from a position in which the lower housing is mounted in the upper housing, wherein the dosimeter sled is slidably mounted in the lower housing, and wherein each of the OSL sensors comprises the OSLM mounted in a first cylindrical cup-shaped filter. ### Claim 16 (depends on 15) The device of claim 15, wherein the upper housing includes two loops on opposite side of the upper housing for threading a strap member through and wherein the loops are graspable by an individual to thereby allow the individual to turn the upper housing 90° relative to the lower housing when the lower housing is prevented from rotating. ### Claim 17 (depends on 15) The device of claim 15, wherein the lower housing comprises one or more rotation preventing engagement structures for engaging respective one or more complementary rotation preventing engagement structures of a dosimeter reader to prevent rotation of the lower housing when the lower housing is loaded in the dosimeter reader. ### Claim 18 (depends on 15) The device of claim 15, wherein the dosimeter sled that is slidably removable from the lower housing and wherein the dosimeter sled includes the one or more OSL sensors. ### Claim 19 (depends on 15) The device of claim 15, wherein the first cylindrical cup-shaped filter comprises aluminum. ### Claim 20 (depends on 15) The device of claim 15, wherein one or more of the OSL sensors comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted. ### Claim 21 (depends on 20) The device of claim 20, wherein the first cylindrical cup-shaped filter comprises aluminum and the second cylindrical cup-shaped filter comprises copper. ### Claim 22 (depends on 15) The device of claim 15, wherein the one or more OSL sensors each comprise one or more filter material discs located between the OSLM and a base of the first cylindrical cup-shaped filter. ### Claim 23 (depends on 22) The device of claim 22, wherein a first OSL sensor of the one or more OSL sensors comprises a converter material disc located between the OSLM and the first filter. ### Claim 24 (depends on 23) The device of claim 23, wherein the converter material disc comprises high-density polyethylene and wherein there is a conformal disc comprising polyethylene located between the OSLM and the converter material disc. ### Claim 25 (depends on 22) The device of claim 22, wherein a second OSL sensor of the one or more OSL sensors comprises a first reference filter material disc located between the OSLM and the first filter. ### Claim 26 (depends on 25) The device of claim 25, wherein the first reference filter material disc comprises polytetrafluorethylene. ### Claim 27 (depends on 26) The device of claim 26, wherein a third OSL sensor of the one or more OSL sensors comprises a second reference filter material disc, wherein the second reference material disc is located between the OSLM and the first filter, and wherein the third OSL sensor is a comparator sensor for the second OSL sensor. ### Claim 28 (depends on 27) The device of claim 27, wherein the second reference filter material disc comprises polytetrafluorethylene. ### Claim 29 (depends on 15) The device of claim 15, wherein the OSLM for each OSL sensor comprises an Al2O3:C material. ### Claim 30 A device comprising: a radiation dosimeter including one or more optically stimulated luminescence (OSL) sensors; and a clip for attachment to a portion of an article of clothing to thereby allow the dosimeter to be worn by an individual, wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) and one or more filters, wherein the dosimeter includes an upper housing and a lower housing and wherein the upper housing is separable from the lower housing, wherein the device comprises a sled that is slidably removable from the lower housing, wherein the sled includes the one or more OSL sensors, wherein the upper housing includes interior screw threads that engage exterior screw threads on the lower housing, and wherein the upper housing is separable from the lower housing when the upper housing is turned 90° relative to the lower housing from a position in which the lower housing is mounted in the upper housing, and wherein each of the one or more OSL sensors comprises the OSLM mounted in a first cylindrical cup-shaped filter. ### Claim 31 (depends on 30) The device of claim 30, wherein the dosimeter includes two loops on opposite sides of the dosimeter which are graspable by an individual to thereby allow the individual to turn the upper housing 90° relative to the lower housing when the lower housing is prevented from rotating and wherein the clip is attached to one of the two loops. ### Claim 32 (depends on 30) The device of claim 30, wherein the lower housing comprises one or more rotation preventing engagement structures for engaging respective one or more complementary rotation preventing engagement structures of a dosimeter reader to prevent rotation of the lower housing when the lower housing is loaded in the dosimeter reader. ### Claim 33 (depends on 30) The device of claim 30, wherein the first cylindrical cup-shaped filter comprises aluminum. ### Claim 34 (depends on 30) The device of claim 30, wherein a selected one or more OSL sensors of the one or more OSL sensors comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted. ### Claim 35 (depends on 34) The device of claim 34, wherein the first cylindrical cup-shaped filter comprises aluminum and the second cylindrical cup-shaped filter comprises copper. ### Claim 36 (depends on 35) The device of claim 35 wherein the one or more OSL sensors each comprise one or more filter material discs located between the OSLM and a base of the first cylindrical cup-shaped filter. ### Claim 37 (depends on 36) The device of claim 36, wherein a first OSL sensor of the one or more OSL sensors comprises a converter material disc located between the OSLM and the first filter. ### Claim 38 (depends on 37) The device of claim 37, wherein the converter material disc is comprises high-density polyethylene and wherein there is a conformal disc comprises polyethylene located between the OSLM and the converter material disc. ### Claim 39 (depends on 38) The device of claim 38, wherein a second OSL sensor of the one or more OSL sensors comprises a first reference filter material disc located between the OSLM and the first filter. ### Claim 40 (depends on 39) The device of claim 39, wherein the first reference filter material disc comprises polytetrafluorethylene. ### Claim 41 (depends on 39) The device of claim 39, wherein a third OSL sensor of the one or more OSL sensors comprises a second reference filter material disc, wherein the second reference material disc is located between the OSLM and the first filter, and wherein the third OSL sensor is a comparator sensor for the second OSL sensor. ### Claim 42 (depends on 41) The device of claim 41, wherein the second reference filter material disc comprises polytetrafluorethylene. ### Claim 43 (depends on 30) The device of claim 30, wherein the OSLM for each OSL sensor comprises an Al2O3:C material.