GB1519800A - Densitometers for use with radiation film dosimeters - Google Patents

Densitometers for use with radiation film dosimeters

Info

Publication number
GB1519800A
GB1519800A GB5221375A GB5221375A GB1519800A GB 1519800 A GB1519800 A GB 1519800A GB 5221375 A GB5221375 A GB 5221375A GB 5221375 A GB5221375 A GB 5221375A GB 1519800 A GB1519800 A GB 1519800A
Authority
GB
United Kingdom
Prior art keywords
sensor
sources
output
film
sensors
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
Application number
GB5221375A
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB5221375A priority Critical patent/GB1519800A/en
Publication of GB1519800A publication Critical patent/GB1519800A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1519800 Densitometers UNITED KINGDOM ATOMIC ENERGY AUTHORITY 8 Dec 1976 [19 Dec 1975] 52213/75 Heading G1A A densitometer (e.g. for a radiation film dosimeter) comprises means 4, 1 Fig. 1 for locating infrared sources 10 and sensors 9 in register to measure the optical density of separate areas of a film; and means Fig. 2 for indicating the output of each sensor 9. The sources 10 (LEDs radiating at 930 nm) and sensors 9 (phototransistors), each having a collimation lens, are adjustably mounted in aluminium tubes 33 in respective hinged blocks 4, 1 of good thermal conductivity, the lower block 1 having a recess 6 for holding a film and for engaging a complementary raised portion 8 of the upper block 4. A second hinged upper block 3, engaging a recess 5 in the lower block 1, carries sources 14, 15 and sensors 12, 13 for temperature compensation and for setting a zero-density level derived from the transmittance of a reference film processed with a batch of test films. In a measuring circuit Fig. 2, the output of a power unit 18 supplying all sources is controlled to stabilize the output of the temperaturecompensating sensor 13. Each pair comprising a source 10 and sensor 9 is switched in sequence by a selector arrangement 19-21, the selected sensor output being compared with that of the zerodensity reference sensor 12, logarithmically amplified at 22, digitized, and printed-out at 30.
GB5221375A 1976-12-08 1976-12-08 Densitometers for use with radiation film dosimeters Expired GB1519800A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5221375A GB1519800A (en) 1976-12-08 1976-12-08 Densitometers for use with radiation film dosimeters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5221375A GB1519800A (en) 1976-12-08 1976-12-08 Densitometers for use with radiation film dosimeters

Publications (1)

Publication Number Publication Date
GB1519800A true GB1519800A (en) 1978-08-02

Family

ID=10463057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5221375A Expired GB1519800A (en) 1976-12-08 1976-12-08 Densitometers for use with radiation film dosimeters

Country Status (1)

Country Link
GB (1) GB1519800A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500929A1 (en) * 1981-02-27 1982-09-03 Dainippon Screen Mfg APPARATUS FOR DETECTING THE BLINKING RANGE OF A FILM
EP0732581A2 (en) * 1995-03-16 1996-09-18 Fondazione Centro San Raffaele Del Monte Tabor Photodensitometer for monitoring safety badges

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500929A1 (en) * 1981-02-27 1982-09-03 Dainippon Screen Mfg APPARATUS FOR DETECTING THE BLINKING RANGE OF A FILM
EP0732581A2 (en) * 1995-03-16 1996-09-18 Fondazione Centro San Raffaele Del Monte Tabor Photodensitometer for monitoring safety badges
EP0732581A3 (en) * 1995-03-16 1998-02-04 Fondazione Centro San Raffaele Del Monte Tabor Photodensitometer for monitoring safety badges

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee