EP0025374A1 - Wandler nicht-sichbarer in sichtbare Photone und Anlage zur zerstörungsfreien Prüfung unter Verwendung dieses Wandlers - Google Patents

Wandler nicht-sichbarer in sichtbare Photone und Anlage zur zerstörungsfreien Prüfung unter Verwendung dieses Wandlers Download PDF

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Publication number
EP0025374A1
EP0025374A1 EP80401179A EP80401179A EP0025374A1 EP 0025374 A1 EP0025374 A1 EP 0025374A1 EP 80401179 A EP80401179 A EP 80401179A EP 80401179 A EP80401179 A EP 80401179A EP 0025374 A1 EP0025374 A1 EP 0025374A1
Authority
EP
European Patent Office
Prior art keywords
photons
luminous
converter
radiation
converter according
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.)
Granted
Application number
EP80401179A
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English (en)
French (fr)
Other versions
EP0025374B1 (de
Inventor
Jean-Claude Michel Dufay
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.)
Laboratoire Central des Ponts et Chaussees
Etat Francais
Original Assignee
Laboratoire Central des Ponts et Chaussees
Etat Francais
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.)
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Publication date
Application filed by Laboratoire Central des Ponts et Chaussees, Etat Francais filed Critical Laboratoire Central des Ponts et Chaussees
Priority to AT80401179T priority Critical patent/ATE7087T1/de
Publication of EP0025374A1 publication Critical patent/EP0025374A1/de
Application granted granted Critical
Publication of EP0025374B1 publication Critical patent/EP0025374B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens

Definitions

  • the present invention relates to a converter of non-luminous photons, called input photons such as X or Y photons, into light photons, of the type comprising a layer of phosphor disposed on the path of said non-visible photons.
  • the invention also relates to an installation for the non-destructive testing of material such as reinforced or prestressed concrete.
  • the radioscopy or gammascopy systems existing in the medical and industrial field operate at a fixed station; it is indeed the part to be checked which moves in front of the control system, and these systems use low and medium energy X-rays: from 10 keV to 200 keV.
  • These systems mostly use an image intensifier (or image intensifier) as an X-ray photon / light photon converter.
  • image intensifier or image intensifier
  • Such an element is relatively heavy and bulky, although of small diameter, and requires a high voltage supply.
  • the image formed, available at the output of this intensifier is analyzed by a television camera and displayed remotely on a television screen.
  • This type of apparatus gives very good quality images only if the radiation used is of low or medium energy and only if the controlled material is of low density and not very diffusing.
  • this same apparatus does not give a satisfactory result if the radiation used is high energy X or 0 radiation (up to 10 MeV), the conversion efficiency of the intensifier then not being high enough, and if the controlled material is dense and very diffusing (case of concrete).
  • the present invention firstly aims to propose a converter having a satisfactory efficiency for input photons of energy greater than 200 keV.
  • the present invention also aims to propose a device - or installation - for non-destructive testing by radioscopy or gamma radiography giving good quality images on concrete thicknesses as large as possible, while being able to use the same sources of radiation as in conventional radiography (Ir 192 and Cobalt 60).
  • the proposed device being intended for use on site, care should be taken to select components of low weight, small dimensions and very good mechanical resistance, with the minimum of servitudes as to the electrical supplies necessary for its operation.
  • the converter according to the invention is characterized in that it further comprises, upstream of said phosphor layer, relative to the direction of movement of the non-luminous input photons, a metal sheet in which said non-luminous photons are converted into non-luminous photons of lower energy, by Compton collision of said high energy photons on electrons of said metallic sheet.
  • the energy of the non-luminous input photons is substantially between 200 keV and 10 MeV.
  • the thickness of the metal sheet is between 100 and 500 ⁇ m.
  • the metal sheet comprises at least one of the following metals: lead, gold.
  • immediately upstream of the phosphor layer is a light reflecting layer.
  • the light reflecting layer is made of titanium oxide.
  • the non-destructive testing installation is characterized in that it comprises: a source of non-luminous photonic radiation directing a flow of said radiation on the material to be checked, a lead filter disposed downstream of this material for stop low energy radiation from the diffusion in said material of radiation from the source, a converter as described above, to transform the photons from said filter into light photons, a mirror inclined relative to the path of said light photons to receiving these photons and directing them onto the input objective of a television camera, and an image viewing device receiving the video signal supplied by said camera.
  • the source, on the one hand, and the detection assembly comprising the converter, the mirror and the television camera, on the other hand, are each associated with respective displacement means for moving them in at least two directions. spatial, these displacement means being remotely controllable.
  • the installation shown includes: a source of X or D radiation, 1 directing a beam of high energy radiation 2 towards a reinforced concrete or prestressed concrete to be inspected 3, a lead filter 4 stopping low energy radiation from the scattering in the material 3 of the radiation 2 originating from the source 1, a converter 5 transforming the X photons or tissues of the filter 4 into light photons 6 forming an image of suitable format, for example of 30 cm x 40 cm, a mirror 7 arranged at 45 ° relative to the plane 5a of the converter 5, this mirror receiving the light 6 supplied by the converter 5 and having a high reflection coefficient, for example 0.97, for the emission wavelength of the converter 5 a television camera 8 analyzing line by line the image reflected by the mirror 7, this camera 8 preferably being at low light level and being equipped with an optical lens 8a of high brightness and large aperture, for example or vrant at f / 0.95, and a viewing device - or monitor - 9 viewing the image obtained from the video signal which is supplied by the camera 8 and which is, if
  • the radiation supplied by the source 1 is preferably of energy between 200 keV and 10 M eV.
  • This source 1 can be a Cobalt 60 or Iridium 192 source; alternatively, this source can be of the type comprising an accelerator directing a flow of electrically charged particles on a target.
  • ⁇ - visible, or X - visible converters generally have a very low efficiency - or yield - as soon as the energy of the X or ⁇ photons exceeds 200 keV. It was therefore excluded to use one of these converters in the inspection and / or control installation presently described.
  • the converter shown in FIG. 2 has the advantage of giving an image of sufficient quality from high energy X or ⁇ photons to look for defects in concrete. Furthermore, such a converter is not fragile, it is simple to use and, in particular, it does not require complicated electronic equipment, and it is thin, light, and available - or easy to make - in dimensions identical to those of the commonly used x-ray films 30 cm x 40 cm.
  • This converter comprises contiguously and from left to right in FIG. 2: a cardboard support 13, a metallic sheet of lead or gold, 14 of approximately 250 ⁇ m thick, arranged on one face of said support 13, a reflective layer of titanium oxide Ti0 2 , 15, of approximately 10 ⁇ m thick, a fluorescent layer of Zn S Cd: Ag, 16 of approximately 1000 ⁇ m in thickness and a protective layer 17 of approximately 10 ⁇ m thick.
  • This type of screen converter typically has a 12.8% improvement in brightness, compared to a known medical fluorescent screen used under the same conditions. The contrast is increased by 12%. Other measurements have also shown that the brightness of this screen is produced mainly by the primary radiation from the material to be checked, whereas in the case of the known medical screen, this brightness is mainly due to the scattered radiation.
  • the limit resolution of the complete chain in Figure 1 is that of the converter, i.e. 1 ⁇ l / mm at 4% contrast.
  • the so-called televised radioscopy chain thus formed typically gives perfectly usable images up to a thickness of concrete traversed by 45 cm for a Cobalt 60 source of 250 Ci, and 1 m thickness for a linear accelerator delivering 700 rad / min at lm at 10 MeV.
  • This televised radioscopy chain is advantageously applied to the control of the quality of concrete injections and to the positioning of prestressed cables in concrete.
  • the source 1 and the detector assembly 4 and 5, 7 and 8, designated below under the reference 19 must move in synchronism on either side of the concrete wall 30 to be inspected. This will be achieved by "piloting on sight” of the assembly according to the principle of FIG. 3.
  • the source 1 and the detection sub-assembly 19 are each associated with means, respectively 20 and 21, for their displacement in X, and Z or in X, Y and Z; the means 20 and 21 are each remotely controlled by a respective manual control device 22 and 23.
  • Figures-4 box bridge
  • 5 beam bridge
  • 6 slab bridge
  • the source 1 is preferably a linear accelerator
  • Figures 3 to 6 the same elements are designated by the same references.
  • Figure 6 shows, on its right and left halves, two modes of arrangement of the inspection chain.
  • the displacement means 20 and 21 are mechanically independent from one another, while, according to FIG. 5, these means are joined together by a structural element 24. According to FIG. 6, a single displacement means 20 ensures the displacement of the units 1 and 19.
  • the so-called high-energy television radioscopy installation which has just been described is mainly intended for the control of prestressed concrete engineering structures, using high energy X or ⁇ radiation (preferably from 200 keV to 10 MeV ). It uses a special fluometric converter specially designed and manufactured for this installation.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Measurement Of Radiation (AREA)
  • Conversion Of X-Rays Into Visible Images (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Led Devices (AREA)
EP80401179A 1979-08-14 1980-08-12 Wandler nicht-sichbarer in sichtbare Photone und Anlage zur zerstörungsfreien Prüfung unter Verwendung dieses Wandlers Expired EP0025374B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80401179T ATE7087T1 (de) 1979-08-14 1980-08-12 Wandler nicht-sichbarer in sichtbare photone und anlage zur zerstoerungsfreien pruefung unter verwendung dieses wandlers.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7920708 1979-08-14
FR7920708A FR2463420A1 (fr) 1979-08-14 1979-08-14 Convertisseur de photons non lumineux en photons lumineux et installation de controle non destructif faisant application de ce convertisseur

Publications (2)

Publication Number Publication Date
EP0025374A1 true EP0025374A1 (de) 1981-03-18
EP0025374B1 EP0025374B1 (de) 1984-04-11

Family

ID=9228848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401179A Expired EP0025374B1 (de) 1979-08-14 1980-08-12 Wandler nicht-sichbarer in sichtbare Photone und Anlage zur zerstörungsfreien Prüfung unter Verwendung dieses Wandlers

Country Status (8)

Country Link
US (1) US4398093A (de)
EP (1) EP0025374B1 (de)
JP (1) JPS56155900A (de)
AT (1) ATE7087T1 (de)
CA (1) CA1171559A (de)
DE (1) DE3067443D1 (de)
ES (1) ES8106210A1 (de)
FR (1) FR2463420A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084818A2 (de) * 1982-01-14 1983-08-03 Fuji Photo Film Co., Ltd. Strahlungsabbildungsspeichertafel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59148853A (ja) * 1983-02-14 1984-08-25 Kansai Electric Power Co Inc:The コンクリ−ト製品等の非破壊検査方法
NL8900040A (nl) * 1989-01-09 1990-08-01 Philips Nv Roentgenbeeldversterkerbuis met selectief filter.
JP3741613B2 (ja) * 2001-01-29 2006-02-01 株式会社光子発生技術研究所 高エネルギーｘ線イメージング装置およびその方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1159277A (fr) * 1955-09-26 1958-06-25 Thomson Houston Comp Francaise Convertisseur à scintillation
US3163765A (en) * 1961-06-14 1964-12-29 Rauland Corp Gamma ray image converters
FR1496819A (fr) * 1966-08-25 1967-10-06 Automatisme Cie Gle Dispositif permettant d'obtenir un faisceau de rayonnement d'énergie réglable à partir d'un faisceau de rayonnement d'énergie constante
US3356851A (en) * 1963-10-22 1967-12-05 Picker X Ray Corp Division Inc Image intensifier tube with separable optical coupler
DE1439344A1 (de) * 1964-03-11 1969-02-13 Siemens Ag Bildwandler
FR2345806A1 (fr) * 1976-03-24 1977-10-21 Rolls Royce Perfectionnements apportes aux intensificateurs d'image

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE792387A (nl) * 1971-12-31 1973-06-07 Agfa Gevaert Nv Versterkingsschermen voor rontgenfotografie
US3758723A (en) * 1972-01-18 1973-09-11 Imagex Inc X-ray inspection system
JPS5210037A (en) * 1975-07-15 1977-01-26 Fujitsu Ltd Shift register circuit
US4195228A (en) * 1978-05-19 1980-03-25 General Electric Company Color contrast radiographic device
US4256965A (en) * 1979-01-15 1981-03-17 The United States Of America As Represented By The Secretary Of The Navy High energy fluoroscopic screen
DE2927428C3 (de) * 1979-07-06 1982-05-19 Siemens AG, 1000 Berlin und 8000 München Leuchtstoff

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1159277A (fr) * 1955-09-26 1958-06-25 Thomson Houston Comp Francaise Convertisseur à scintillation
US3163765A (en) * 1961-06-14 1964-12-29 Rauland Corp Gamma ray image converters
US3356851A (en) * 1963-10-22 1967-12-05 Picker X Ray Corp Division Inc Image intensifier tube with separable optical coupler
DE1439344A1 (de) * 1964-03-11 1969-02-13 Siemens Ag Bildwandler
FR1496819A (fr) * 1966-08-25 1967-10-06 Automatisme Cie Gle Dispositif permettant d'obtenir un faisceau de rayonnement d'énergie réglable à partir d'un faisceau de rayonnement d'énergie constante
FR2345806A1 (fr) * 1976-03-24 1977-10-21 Rolls Royce Perfectionnements apportes aux intensificateurs d'image

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084818A2 (de) * 1982-01-14 1983-08-03 Fuji Photo Film Co., Ltd. Strahlungsabbildungsspeichertafel
EP0084818A3 (en) * 1982-01-14 1984-03-07 Fuji Photo Film Co., Ltd. Radiation image storage panel

Also Published As

Publication number Publication date
EP0025374B1 (de) 1984-04-11
JPS56155900A (en) 1981-12-02
US4398093A (en) 1983-08-09
FR2463420B1 (de) 1982-11-12
CA1171559A (fr) 1984-07-24
ES494236A0 (es) 1981-07-16
ES8106210A1 (es) 1981-07-16
DE3067443D1 (en) 1984-05-17
FR2463420A1 (fr) 1981-02-20
ATE7087T1 (de) 1984-04-15

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