Patent US4406947A successfully refreshed from Google Patents.
US4406947A
Expired / Lapsed
US
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Calibrating device for ionizing radiation dosimeters
Assignee: United States Department of the Navy
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Filing: 1981-04-17
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Granted: 1983-09-27
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Expires: 2001-04-17
Abstract
Abstract A transportable calibration and storage device for use in calibrating radion dosimeters. The calibration device comprises a drum filled with a radiation attenuating material that may be solid, water, or water-extended solid. This material shields the radiation source that is retained in a safe position in the drum at all times. During the calibration cycle the radiation source may be moved to a low or high calibration position within the drum so as to allow calibration of the dosimeter with a known radiation intensity.
Inventors
- 👤 Charles A. Burton
- 👤 Gordon K. Riel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:09
CPC Classifications
G; G01; G01D; G01D18/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
A calibrating device for ionizing radiation dosimeters comprising a cylindrical drum, a solid polymeric lining filling the entire opening within the drum, wherein the polymeric filling is capable of shielding ionizing radiation, a cylindrical opening through the polymeric filling, said opening filled with a longitudinal sleeve means located within said filling including multiple slotted means positioned in a rigid sleeve member, wherein each slotted means corresponds to a separate calibration position, the said sleeve fitted with handle means to hold and vertically move a radiation source along the axis of the cylindrical opening for the purpose of moving the radiation source from a storage position to multiple calibration positions and with means to remove the handle from the source so that the cylindrical opening from the source to the top is open to receive a radiation dosimeter that is to be calibrated by exposure to the source.
Claim 2
Dependent Claim
147 words
A calibrating device for ionizing radiation dosimeters comprising a cylindrical drum, a solid polymeric lining filling the entire opening within the drum, wherein the polymeric filling is capable of shielding ionizing radiation, a cylindrical opening through the polymeric filling, said opening filled with a longitudinal sleeve means located within said filling including multiple slotted means positioned in a rigid sleeve member, wherein each slotted means corresponds to a separate calibration position, the said sleeve fitted with handle means to hold and vertically move a radiation source along the axis of the cylindrical opening for the purpose of moving the radiation source from a storage position to multiple calibration positions and with means to remove the handle from the source so that the cylindrical opening from the source to the top is open to receive a radiation dosimeter that is to be calibrated by exposure to the source.
Claim 3
Dependent Claim
17 words
The calibrating device of claim 1 wherein a metal sleeve means is inserted in the cylindrical opening.
Claim 4
Dependent Claim
20 words
The calibrating device of claim 1 wherein the polymeric filling is a water extended polyester that is a solid material.
Claim 5
Dependent Claim
27 words
The calibrating device of claim 1 wherein the sleeve is fitted with a cylindrical handle that is mechanically attached at its lower end to a radioactive source.
Claim 6
Dependent Claim
70 words
The calibrating device of claim 1 wherein the radiation source holding means is a combination of a cylindrical handle mechanically attached to a source holder, the handle, the said cylindrical handle being slidably encased in a vertically oriented cylindrical sleeve, with mechanical means located at multiple positions along the vertical axis of the sleeve to securely position the source holder at several successively different levels along the vertically oriented sleeve.
Claim 7
Dependent Claim
24 words
The calibrating device of claim 5 wherein the means to move the radiation source holder comprises a cylindrical handle made of a polymeric material.
Claim 8
Dependent Claim
24 words
The calibrating device of claim 6 wherein the cylindrical handle is supported by a cylindrical rod positioned at the base of the cylindrical opening.
Claim 9
Dependent Claim
24 words
The calibrating device of claim 6 wherein the cylindrical handle is attached at its lower end to a radiation source holder by mechanical means.
Claim 10
Dependent Claim
23 words
The calibrating device of claim 8 wherein the mechanical means for attachment of the source holder is a set of standard screw threads.
Claim 11
Dependent Claim
27 words
The calibrating device of claim 5 wherein the radiation source holder is fitted with means to physically attach the radiation source holder to the surrounding sleeve means.
Claim 12
Dependent Claim
31 words
The calibrating device of claim 6 wherein the radiation source holder is fitted with a horizontal attachment means that fits within the confines of a slot in the said sleeve means.
Claim 13
Dependent Claim
42 words
The calibrating device of claim 11 wherein a plurality of horizontally disposed slots are located at selected intervals along the vertical axis of the sleeve means, each of said slots being capable of accommodating the horizontal attachment means on the radiation holder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-26 | 1987-03-28 | 1987-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-26 | 1991-03-28 | 1991-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-26 | 1995-03-28 | 1995-09-27 | $7700.00 | Window Closed / Lapsed |