You need JavaScript to view this

Studies on radiation-image detectors; Etudes sur les detecteurs a images de rayonnements; Izuchenie detektorov izobrazheniya radiatsii; Estudios sobre detectores de radiaciones productores de imagenes

Conference:

Abstract

Work underway on radiation detectors capable of preserving spatial distribution information is described. We are concerned primarily with problems of determining intensity distributions in a plane or possibly over a cylindrical surface. This class of problems includes neutron diffraction, neutron radiography and X-ray and {gamma}-ray radiography or scattering studies with these radiations. Emphasis is being given to imaging radiation detectors based on spark breakdown and on luminescence or stimulated phosphorescence. We have developed very large spark counters which weigh over 100 lb and have sensitive areas of about 2000 cm{sup 2} defined by staggered planar arrays of up to 400 anode and cathode wires. Flow-counter operation using an air or argon-methane gas atmosphere provides an alpha-sensitive system and slow neutron detection is accomplished with enriched B{sup 10} converter plates. With other fill gases, proton and electron sensitivity has been demonstrated. Read-out of the intensity distribution is by photographic recording of the spark distribution. Neutron Laue patterns have been recorded in ten minutes using the Armour Research Reactor at low power; peak core flux was 10{sup 11} nv and the collimator was a straight 1 x 1 cm tube. Application of these counters to other neutron studies are described with comments  More>>
Authors:
Reiffel, L [1] 
  1. Armour Research Foundation, Chicago, IL (United States)
Publication Date:
Apr 15, 1962
Product Type:
Conference
Resource Relation:
Conference: Conference on Nuclear Electronics, Belgrade, Yugoslavia (Serbia), 15-20 May 1961; Other Information: 9 figs, 7 refs; Related Information: In: Nuclear Electronics I. Proceedings of the Conference on Nuclear Electronics. Vol. I| 611 p.
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; AIR; ANODES; ARGON; BORON 10; CATHODES; COLLIMATORS; FLOW COUNTERS; IMAGES; METHANE; NEUTRON DIFFRACTION; NEUTRON RADIOGRAPHY; PHOSPHORESCENCE; PHOTOGRAPHY; PROTONS; READOUT SYSTEMS; RESEARCH REACTORS; SCINTILLATION COUNTERS; SENSITIVITY; SLOW NEUTRONS; SPARK COUNTERS; SPATIAL DISTRIBUTION; X RADIATION
OSTI ID:
22028328
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA12N1951116594
Submitting Site:
INIS
Size:
page(s) 269-284
Announcement Date:
Jan 18, 2013

Conference:

Citation Formats

Reiffel, L. Studies on radiation-image detectors; Etudes sur les detecteurs a images de rayonnements; Izuchenie detektorov izobrazheniya radiatsii; Estudios sobre detectores de radiaciones productores de imagenes. IAEA: N. p., 1962. Web.
Reiffel, L. Studies on radiation-image detectors; Etudes sur les detecteurs a images de rayonnements; Izuchenie detektorov izobrazheniya radiatsii; Estudios sobre detectores de radiaciones productores de imagenes. IAEA.
Reiffel, L. 1962. "Studies on radiation-image detectors; Etudes sur les detecteurs a images de rayonnements; Izuchenie detektorov izobrazheniya radiatsii; Estudios sobre detectores de radiaciones productores de imagenes." IAEA.
@misc{etde_22028328,
title = {Studies on radiation-image detectors; Etudes sur les detecteurs a images de rayonnements; Izuchenie detektorov izobrazheniya radiatsii; Estudios sobre detectores de radiaciones productores de imagenes}
author = {Reiffel, L}
abstractNote = {Work underway on radiation detectors capable of preserving spatial distribution information is described. We are concerned primarily with problems of determining intensity distributions in a plane or possibly over a cylindrical surface. This class of problems includes neutron diffraction, neutron radiography and X-ray and {gamma}-ray radiography or scattering studies with these radiations. Emphasis is being given to imaging radiation detectors based on spark breakdown and on luminescence or stimulated phosphorescence. We have developed very large spark counters which weigh over 100 lb and have sensitive areas of about 2000 cm{sup 2} defined by staggered planar arrays of up to 400 anode and cathode wires. Flow-counter operation using an air or argon-methane gas atmosphere provides an alpha-sensitive system and slow neutron detection is accomplished with enriched B{sup 10} converter plates. With other fill gases, proton and electron sensitivity has been demonstrated. Read-out of the intensity distribution is by photographic recording of the spark distribution. Neutron Laue patterns have been recorded in ten minutes using the Armour Research Reactor at low power; peak core flux was 10{sup 11} nv and the collimator was a straight 1 x 1 cm tube. Application of these counters to other neutron studies are described with comments on the ultimate resolution to be obtained with smaller electrode spacings, dynamic scanning and possibly space filtering of the optical image. A second general approach to radiation-image detection concerns the use of luminescent or phosphorescent converter screens. Matrices of luminescent fibres are being tested which comprise very thin giass tubes filled with liquid scintillator. These are useful in X-ray and {gamma}-ray detection and either the wall materials or the core liquid may be ''loaded'' to obtain neutron sensitivity. New methods of fabricating various types of luminescent fibre screens are presented together with optical performance data also germane to scintillation-chamber technology. Possible imaging detectors using thick blocks of material which are capable of significant energy storage and stimulated phosphorescence upon irradiation are discussed briefly along with read-out methods using optical scanning beams to eliminate resolution loss due to finite phosphor thickness. (author) [French] Le memoire decrit les travaux qui ont ete entrepris sur des detecteurs de rayonnements capables de fournir des informations tout a fait exactes sur la distribution spatiale. Il s'agit avant tout de determiner des distributions d'intensites dans un plan, ou eventuellement sur un cylindre. Cette categorie de problemes comprend la diffraction des neutrons, la radiographie des neutrons, ainsi que la radiographie aux rayons X ou {gamma} ou les etudes de diffusion avec ces rayons. L'auteur s'occupe surtout des detecteurs a images de rayonnements, fondes sur la distribution des etincelles et sur la luminescence Ou la phosphorescence stimulee. Le laboratoire de Armour Research a mis au point de tres grands compteurs a etincelles, pesant plus de 100 livres et comportant des zones sensibles de l'ordre de 2000 cm{sup 2}, definies par des assemblages de plans comprenant chacun jusqu'a 400 fils d'anode et de cathode, les anodes et les cathodes etant respectivement disposees en quinconce. Un compteur a courant gazeux contenant de l'air ou un melange d'argon et de methane constitue un systeme sensible aux rayonnements alpha; la detection des neutrons lents se fait avec des plaques en {sup 10}B enrichi. Avec d'autres gaz de remplissage l'appareil est sensible aux protons et aux electrons. La lecture de la distribution d'intensite se fait par enregistrement photographique de la distribution des etincelles. Des diagrammes de taches de Laue ont pu etre enregistres en dix minutes a l'aide du reacteur d'Armour Research fonctionnant a faible puissance; le flux de crete dans le coeur etait de 10{sup 11} n/cm{sup 2} s et le collimateur etait constitue par un tube droit de 1 cm sur 1 cm. L'auteur expose l'application de ces compteurs a d'autres etudes neutroniques et presente des observations sur le plus grand pouvoir de resolution que l'on puisse obtenir avec de plus faibles ecartements des electrodes, en procedant a un depouillement dynamique et, eventuellement, par filtrage de l'image optique. Une autre methode generale de detection des rayonnements par l'image consiste dans l'emploi d'ecrans de conversion luminescents ou phosphorescents. Des matrices en fibres luminescentes, composees de tubes de verre tres minces contenant un scintillateur liquide, ont fait l'objet d'essais. Ces matrices sont tres utiles pour la detection des rayons X et des rayonnements {gamma}; les matieres constituant la paroi, ou bien le liquide du coeur, peuvent etre en vue de les rendre sensibles aux neutrons. Le memoire expose de nouvelles methodes de fabrication de divers types d'ecrans en fibres luminescentes, ainsi que des donnees sur le comportement optique, qui ont des rapports avec la technologie de la chambre a scintillation. L'auteur examine brievement des detecteurs a images qui emploieraient des blocs epais de materiaux et qui seraient capables d'emmagasiner des energies non negligeables et d'emettre une phosphorescence stimulee par irradiation; il passe egalement en revue les methodes de lecture utilisant un procede de depouillement optique pour obvier a la diminution du pouvoir de resolution occasionnee par l'epaisseur finie du scintillateur. (author) [Spanish] El autor describe los trabajos sobre detectores de radiaciones capaces de proporcionar informacion sobre la distribucion espacial de estas. Las investigaciones se refieren principalmente al problema de determinar la distribucion de intensidades en un plano, o, si es posible, en una superficie cilindrica. Ello implica estudios sobre difraccion y radiografia neutronicas, sobre radiografia con rayos X y con rayos gamma o sobre la dispersion de estas radiaciones. Se concede especial atencion a los detectores capaces de producir imagenes, basados en el principio de la descarga disruptiva de la luminiscencia o de la fosforescencia estimulada. Se han construido contadores de chispa muy grandes, que pesan mas de 100 libras y tienen zonas sensibles de unos 2000 cm{sup 2}, definidas por redes planas alternadas de hasta 400 hilos anodicos y catodicos. Como contadores de flujo gaseoso, utilizando aire o argon-rretano, permiten obtener un sistema sensible a las particulas alfa; la deteccion de neutrones lentos se efectua por medio de placas convertidoras de {sup 10}B enriquecido. Utilizando otros gases de llenado, se ha observado que el contador es sensible a los protones y a los electrones. La lectura de la distribucion de intensidades se efectua por reproduccion fotografica de la distribucion de las chispas. Se han obtenido diagramas de difraccion neutronica de Laue en diez minutos, utilizando el reactor de investigaciones de Armour en regimen de baja potencia; el flujo maximo en el nucleo fue de 10{sup 11} nv y se utilizo como colimador un tubo recto de 1 cm x 1 cm. El autor describe las aplicaciones de estos contadores a otros estudios sobre neutrones y expone consideraciones sobre el poder de resolucion que se podra obtener con menor separacion entre los electrodos, exploracion dinamica y, posiblemente, filtrado espacial de la imagen optica. Otro metodo para abordar la deteccion de radiaciones con reproduccion de imagenes consiste en el empleo de pantallas convertidoras de material luminiscente o fosforescente. Se estan ensayando matrices de fibras luminiscentes compuestas de tubos de vidrio muy finos, rellenos de un liquido centelleador. Estas matrices son utiles para detectar rayos X y rayos gamma, y es posible el material de los tubos o el liquido de relleno para hacerlas sensibles a los neutrones. El autor describe nuevos metodos para fabricar varios tipos de pantallas de fibra luminiscente y expone datos relativos a sus caracteristicas opticas, que son tambien aplicables a la tecnologia de la camara de centelleo. Examina brevemente algunos tipos de detectores productores de imagenes, que podrian construirse empleando gruesos bloques de sustancias capaces de acumular energia en cantidad considerable y de producir fosforescencia estimulada cuando se someten a irradiacion, asi como algunos metodos de lectura en los que se emplean haces opticos de exploracion para evitar la disminucion de poder de resolucion debida al espesor finito del fosforo. (author) [Russian] Opisana provodimaya v nastoyashchee vremya rabota po izucheniyu detektorov izobrazheniya radiatsii, sposobnykh sokhranyat' informatsiyu o prostranstvennom raspredelenii. My zanimaemsya, glavnym obrazom, izucheniem problem, svyazannykh s opredeleniem raspredeleniya intensivnosti radiatsii na ploskosti, a vozmozhno, i na tsilindricheskoj poverkhnosti. V ehtu kategoriyu problem vkhodyat diffraktsiya nejtronov i radiografiya, a takzhe radiografiya rentgenovskikh luchej i gamma-izluchenij, ili zhe issledovanie rasseyaniya s pomoshch'yu takikh vidov izluchenij. Osobyj upor delaetsya na izuchenie detektorov izobrazheniya radiatsii, osnovannykh na razrushenii iskr, i na lyuminestsentsii ili navedennoj fosforestsentsii. My vyrabotali schetchiki iskr ochen' bol'shikh razmerov, vesom bolee 100 funtov, imeyushchie svetochuvstvitel'nye poverkhnosti poryadka 2000 kv. sm., kotorye snabzheny sistemoj ustupchatykh ploskostej pochti s 400 anodnykh i katodnykh provodov. Primenenie schetchikov, napolnennykh VOZDUKHOM ili gazovoj smes'yu argona s metanom dlya izmereniya potoka, sozdaet ustrojstvo, chuvstvitel'noe k al'fa-chastitsam, a obnaruzhenie medlennykh nejtronov dostigaetsya plastinami preobrazovatelya, obogashchennogo B{sup 10}. S drugimi zapolnyayushchimi gazami obnaruzhivalas' chuvstvitel'nost' k protonam i ehlektronam. Registratsiya raspredeleniya intensivnosti dostigaetsya fotograficheskoj s{sup e}mkoj raspredeleniya iskr. Pri rabote s issledovatel'skim reaktorom Armor na rezhime maloj moshchnosti za desyat' MINUT byla zasnyata kartina raspredeleniya nejtronov po Laueh; pikovyj potok aktivnoj zony sostavlyal 10{sup 11} nv, a kollimator sostoyal iz pryamoj trubki diametrom 1 X 1 cm. Opisano primenenie ehtikh schetchikov dlya drugikh nejtronnykh issledovanij s ukazaniem nailuchshej dostizhimoj razreshayushchej sposobnosti, kotoraya mozhet byt' poluchena pri men'shikh rasstoyaniyakh mezhdu ehlektrodami, ispol'zovanii dinamicheskoj razvertki, a, vozmozhno, i pri prostranstvennom fil'trovanii opticheskogo izobrazheniya. Vtorym obshchim podkhodom k obnaruzheniyu izobrazheniya, vyzyvaemogo radiatsiej, yavlyaetsya ispol'zovanie v preobrazovatele lyuminestsiruyushchikh i fosforestsiruyushchikh ehkranov. V nastoyashchee vremya ispytyvayutsya matritsy lyuminestsiruyushchikh volokon, sostoyashchikh iz ves'ma tonkikh steklyannykh trubok, napolnennykh stsintillyatsionnoj zhidkost'yu. EHti matritsy oka- zyvayutsya poleznymi pri obnaruzhenii rentgenovskikh luchej i gamma-izluchenij; dlya polucheniya chuvstvitel'nosti k nejtronam MOGUT ''zaryazhat'sya'' libo materialy stenok, libo soderzhashchayasya vnutri trubok zhidkost'. BUDUT izlozheny novye metody vyrabotki lyuminestsiruyushchikh voloknistykh ehkranov razlichnogo tipa s ukazaniem ikh opticheskikh svojstv, chto takzhe tesno svyazano s tekhnologiej stsintillyatsionnykh kamer. BUDUT kratko obsuzhdeny vozmozhnosti postrojki vosproizvodyashchikh izobrazheniya detektorov s ispol'zovaniem tolstykh blokov materiala, sposobnykh khranit' znachitel'nyj zapas ehnergii i vyzyvat' fosforestsentsiyu pri ikh obluchenii; budut takzhe opisany metody otscheta pokazanij pri pomoshchi opticheskoj razvertki luchej dlya ustraneniya poter' v razreshayushchej sposobnosti iz-za konechnoj tolshchiny lyuminofora. (author)}
place = {IAEA}
year = {1962}
month = {Apr}
}