US3783292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha particle dosimeter
Assignee: General Electric Co
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Filing: 1971-07-16
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Granted: 1974-01-01
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Expires: 1991-07-16
Abstract
Abstract A dosimeter for recording alpha particles using trackregistration material is disclosed. The dosimeter consists of a housing and an insert means holding the track-registration material. The dosimeter can be secured to a hat worn by a person working in an environment to be monitored, such as a uranium mine, which may contain quantities of radon gas and radon daughter products. The insert means is easily secured to and removed from the housing. The dosimeter is exceptionally small, light-weight and effective. The combined housing and insert means provides shielding for the film against unwanted radiation from deposited alpha-emitting particles and protects the film from physical contamination.
Inventors
- 👤 H Alter
- 👤 D Lovett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:57
CPC Classifications
G; G01; G01T; G01T5/00; G01T5/10; G01T1/00; G01T1/02; Y; Y10; Y10S; Y10S250/00; Y10S250/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
An alpha particle dosimeter for recording alpha radiation comprising, in combination, a. a housing having i. a support slot capable of receiving an inserted tongue, ii. fastening means for locking the inserted tongue into the housing and iii. a protruding lip on the housing; and b. an insert means having i. a tongue capable of being inserted into the support slot of the housing and the tongue having receiving means for receiving the fastening means of the housing to form a connection and ii. groove means capable of receiving and holding a piece of track-registration film so that one face of the film is substantially exposed to the atmosphere.
Claim 2
Dependent Claim
109 words
An alpha particle dosimeter for recording alpha radiation comprising, in combination, a. a housing having i. a support slot capable of receiving an inserted tongue, ii. fastening means for locking the inserted tongue into the housing and iii. a protruding lip on the housing; and b. an insert means having i. a tongue capable of being inserted into the support slot of the housing and the tongue having receiving means for receiving the fastening means of the housing to form a connection and ii. groove means capable of receiving and holding a piece of track-registration film so that one face of the film is substantially exposed to the atmosphere.
Claim 3
Dependent Claim
18 words
The dosimeter of claim 1 in which a piece of track-registration film is inserted into the groove means.
Claim 4
Dependent Claim
13 words
The dosimeter of claim 2 in which the track-registration film is cellulose nitrate.
Claim 5
Dependent Claim
17 words
The dosimeter of claim 1 in which the housing is fastened to a brim of a helmet.
Claim 6
Dependent Claim
16 words
The dosimeter of claim 1 in which the housing and insert means are comprised of plastic.
Claim 7
Dependent Claim
12 words
The dosimeter of claim 5 in which the plastic is a polycarbonate.
Claim 8
Dependent Claim
20 words
The dosimeter of claim 1 in which the groove means has an opening to enable removing an inserted film therefrom.
Claim 9
Dependent Claim
14 words
The dosimeter of claim 1 in which the insert means has identifying writing thereon.
Claim 10
Dependent Claim
27 words
The dosimeter of claim 1 in which the fastening means is a bolt threaded in the housing and the receiving means in the tongue is an opening.
Claim 11
Dependent Claim
27 words
The dosimeter of claim 1 in which the fastening means is a spring lock in the housing and the receiving means in the tongue is a slot.
Claim 12
Dependent Claim
38 words
The dosimeter of claim 1 wherein a track-registration film is positioned in the groove means such that alpha radiation emitted by radioactive particles deposited on the surface of components of the dosimeter cannot register on the track-registration film.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |