US3385968A - Radioactive radiation dosimeter of the silver phosphate glass type - Google Patents

Radioactive radiation dosimeter of the silver phosphate glass type Download PDF

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Publication number
US3385968A
US3385968A US521284A US52128466A US3385968A US 3385968 A US3385968 A US 3385968A US 521284 A US521284 A US 521284A US 52128466 A US52128466 A US 52128466A US 3385968 A US3385968 A US 3385968A
Authority
US
United States
Prior art keywords
casing
lid
bottom part
rim
outer casing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US521284A
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English (en)
Inventor
Bryer Robert George
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RA Stephen and Co Ltd
Original Assignee
RA Stephen and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RA Stephen and Co Ltd filed Critical RA Stephen and Co Ltd
Application granted granted Critical
Publication of US3385968A publication Critical patent/US3385968A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/02—Dosimeters
    • G01T1/10—Luminescent dosimeters

Definitions

  • This invention relates to dosimeters of the locket type, for personal wear.
  • the invention has for its object to provide an improved form thereof.
  • the invention is particularly applicable to a locket type dosimeter of the non-direct reading type.
  • a dosirneter there is used an element of radiation-sensitive material, the effect of radiation upon which is not directly observable, so that the element must be examined by a separate reading means to ascertain the degree of radiation to which it has been subjected.
  • An example of such a material having the desired properties is a glass containing a dissociable phosphate material, such as silver phosphate. In practice it is required to remove or expose the element in the reader, and so it is necessary that the element should be mounted in a manner to afford repeated and ready access to it.
  • the present invention has for its object to provide a dosimeter locket which provides an adequate seal for the element, and which can be readily and repeatedly opened for reading.
  • the invention includes a dosimeter including a radiation-sensitive element, a casing for sealing said element, said casing being adapted to be opened at will to give access to said element, said casing including two separable parts and a resilient sealing member engaged between adjacent surfaces of said parts, said surfaces lying about an access opening, and a housing for receiving said casing and for imposing sealing pressure on said surfaces, said housing having two portions respectively engaging said casing parts and being relatively rotatable for imposing said pressure on said surfaces, at least one of said parts having localized engagement with its associated housing portion, whereby to permit rotation relative thereto.
  • the inner casing is made of steel, brass or a like metal which, unlike plastic materials, will not allow to any great extent the passage by diffusion of gases or vapors into the inner casing, will not produce emanations of a derogatory nature in the gas-containin g enclosure, and will not deform with age or temperature. It has been found that the only metal which diffuses gases much more readily than plastic is palladium. This metal is of course much too expensive to consider for use in dosimeters.
  • the same is subjected to radiation directed upon it from a first direction, and the desired indication obtained as a function of a radiation, such as one of different wavelength, emerges from the element in a second direction, at an angle, preferably a right angle, to the first.
  • a radiation such as one of different wavelength
  • the element must be readily removable from the locket to enable the desired reading to be made, or alternatively, the element must be so accommodated in the locket as to enable this to be done.
  • a locket is provided which can be located, while in its normally closed condition, in a reader and then by a simple action the element can be exposed for reading, remaining located in the reader.
  • FIG. 1 is a half plan view of a locket
  • FIG. 2 is a medial section through the locket.
  • This locket comprises an outer casing 10 suitably made of a molded synthetic plastic material and having a central recess 11 which accommodates a lead shield 12 and an inner casing 13 of metal.
  • the lead shield 12 is located on casing 10 by means of an annular projection 10a formed integrally with casing 10 and engaging in a central opening 14 in the shield 12.
  • the casing 13, and with it the shield 12 are secured against axial movement relative to casing 10 by a pin 15 attached to inner casing 13 and passing through outer casing 10 into a recess 10b, the pin being held, for example, by deforming its free end over a washer 16, or alternatively by a spring ring engaging in a groove formed in the pin.
  • the casing 13 is free to rotate.
  • the portion 10c of casing 10 defining the opening to the recess 11 is screw-threaded to receive a lid 17 having a screwthreaded peripheral portion 17a.
  • Supported on lid 17 are a lead disk 18 and an inner casing lid 20; the outer edge 20a of lid 20 is depressed as shown and fits within an annular recess 17b of the lid 17 and thus provides a receptacle for a sealing O-ring 21.
  • O-ring 21 cooperates with a flanged outer edge 13a of the casing 13 to provide a completely sealed enclosure between inner casings 13 and 20 when the lid 17 is screwed into the access opening of casing 10.
  • a rather large gap is shown between flanged edge 13a and casing 20. In practice this gap will be very small or nonexistent, since during assembly O-ring 21 is deformed until edge 13a and casing 20 come in contact with each other.
  • the seal which is formed by O-ring 21 does not prevent gases from diffusing into the inner casing, but it occupies a minute fraction of the total surface area of the inner casing, and accordingly, the amount of gases which can diffuse through the seal is minute and negligible for all practical purposes.
  • a small block 22 of glass which contains silver metaphopshate.
  • the lead shields 12 and 18 may have in them perforations of suitable size in order to equalize the response of the glass 22 to different energy levels.
  • the outer casing 10 also has an integrally formed projection 10d provided with a hole 25 for supporting cord or the like.
  • lid 17 Holes 23 in lid 17 enable the locket to be located, unopened, on corresponding locating pins in the reader; the casing 10 is then unscrewed from the lid 17 without the use of a separate tool, leaving the glass block exposed for reading in the manner previously described.
  • the casing 10 may be formed with an interrupted groove or grooves which can receive projections formed on the peripheral portion of the lid 17 when it is angularly rotated with respect to the casing 10.
  • the glass 22 is completely sealed and is thereby protected against contamination by the atmosphere, or against any migration of a constituent of the casing 10 or its lid 17; operation of the dosimeter is thereby stabilized over long periods.
  • a portable dosimeter comprising in combination:
  • an inner casing made of a substantially gas impervious material and having an imperforate generally cup-shaped bottom part nested in the outer casing bottom part and an imperforate lid fitted between the lid of the outer casing and the peripheral rim of the bottom part of the inner casing, said rim terminating in an outwardly extended flange and said inner casing lid having a set-off peripheral rim disposed in parallel superimposition with said flange spaced apart therefrom to define an annular space between said flange and said rim;
  • sealing pressure being applicable to the ring by screwing the outer casing lid into the outer casing bottom part;

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measurement Of Radiation (AREA)
US521284A 1962-05-21 1966-01-18 Radioactive radiation dosimeter of the silver phosphate glass type Expired - Lifetime US3385968A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19462/62A GB976110A (en) 1962-05-21 1962-05-21 Improvements in and relating to devices for the detection of radio activity

Publications (1)

Publication Number Publication Date
US3385968A true US3385968A (en) 1968-05-28

Family

ID=10129773

Family Applications (1)

Application Number Title Priority Date Filing Date
US521284A Expired - Lifetime US3385968A (en) 1962-05-21 1966-01-18 Radioactive radiation dosimeter of the silver phosphate glass type

Country Status (5)

Country Link
US (1) US3385968A (fr)
CH (1) CH397093A (fr)
DK (1) DK116011B (fr)
GB (1) GB976110A (fr)
SE (1) SE309635B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984921A (en) * 1989-04-03 1991-01-15 The Mennen Company Sealing cap for elongated roll-on package
US5158385A (en) * 1989-04-03 1992-10-27 The Mennen Company Sealing cap for elongated roll-on package

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415031A (en) * 1945-04-09 1947-01-28 Firestone Tire & Rubber Co Sealing closure
US2580057A (en) * 1947-01-23 1951-12-25 Joseph F Wilhelm Float gauge
US2750515A (en) * 1952-02-12 1956-06-12 Polaroid Corp Radiation detection devices
US2879914A (en) * 1957-10-17 1959-03-31 Lambert W Fleckenstein Closure caps
US3042802A (en) * 1959-01-06 1962-07-03 Specialty Engineering & Electr Radiation detectors
US3100262A (en) * 1961-07-19 1963-08-06 Ind Electronic Hardware Corp Dosimeter of the radio photoluminescent glass type

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415031A (en) * 1945-04-09 1947-01-28 Firestone Tire & Rubber Co Sealing closure
US2580057A (en) * 1947-01-23 1951-12-25 Joseph F Wilhelm Float gauge
US2750515A (en) * 1952-02-12 1956-06-12 Polaroid Corp Radiation detection devices
US2879914A (en) * 1957-10-17 1959-03-31 Lambert W Fleckenstein Closure caps
US3042802A (en) * 1959-01-06 1962-07-03 Specialty Engineering & Electr Radiation detectors
US3100262A (en) * 1961-07-19 1963-08-06 Ind Electronic Hardware Corp Dosimeter of the radio photoluminescent glass type

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984921A (en) * 1989-04-03 1991-01-15 The Mennen Company Sealing cap for elongated roll-on package
US5158385A (en) * 1989-04-03 1992-10-27 The Mennen Company Sealing cap for elongated roll-on package

Also Published As

Publication number Publication date
DK116011B (da) 1969-12-01
SE309635B (fr) 1969-03-31
CH397093A (fr) 1965-08-15
GB976110A (en) 1964-11-25

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