# US 8,541,749 B2 · Portable reader for a dosimeter

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- Number: US 8,541,749 B2
- Document ID: US8541749B2
- Status: Granted
- Kind: B2
- Application number: 12/757,140
- 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/US8541749B2

## 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

Described is a dosimeter reader for reading a plurality of optically stimulated luminescence (OSL) sensors of a dosimeter sled and for reading an RFID tag on the dosimeter sled.

## Claims

### Claim 1

A device comprising:
an optically stimulated luminescence (OSL) reader for reading one or more OSL sensors of a dosimeter sled;
a sled slider for pulling and pushing the dosimeter sled; and
an RFID tag reader for communicating with an RFID tag mounted on the dosimeter sled,
wherein the sled slider moves the dosimeter sled within a dosimeter reading region to a respective reading position for each of the respective one or more OSL sensors,
wherein each OSL sensor is read at by the OSL reader at the respective reading position for the OSL sensor,
wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) mounted in a first cylindrical cup-shaped filter, and wherein the first cylindrical cup-shaped filter comprises a first energy compensating material,
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,
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,
wherein the converter material disc is comprised of high-density polyethylene and wherein there is an conformal disc comprised of polyethylene located between the OSLM and the converter material disc, and
wherein a second OSL sensor of the one or more OSL sensors comprises a reference filter material disc comprised of polytetrafluoroethylene located between the OSLM and the first cylindrical cup-shaped filter.

### Claim 2 (depends on 1)

The device of claim 1, wherein the RFID tag reader communicates with the RFID tag when the dosimeter sled is in a reading position for one of the OSL sensors.

### Claim 3 (depends on 1)

The device of claim 1, wherein the first cylindrical cup-shaped filter is comprised of aluminum.

### Claim 4 (depends on 1)

The device of claim 1, wherein the first cylindrical cup-shaped filter comprises a plastic having metal particles dispersed therein.

### Claim 5 (depends on 1)

The device of claim 1, wherein a first OSL sensor 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 first cylindrical cup-shaped filter is comprised of aluminum.

### Claim 8 (depends on 7)

The device of claim 7, wherein OSL sensor further comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted.

### Claim 9 (depends on 8)

The device of claim 8, wherein the second cylindrical cup-shaped filter is comprised of copper.