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In Vivo and Air Dosimetry of Fission-Spectrum Neutrons; Dosimetrie In Vivo et dans l'Air du Spectre des Neutrons de Fission; Dozimetriya v vozdukhe i dozimetriya In Vivo nejtronov spektra deleniya; Dosimetria In Vivo y en el Aire de Neutrones de un Espectro de Fision

Abstract

In an attempt to estimate the depth-dose pattern during exposure to fission-spectrum neutrons, a method of in vivo neutron dosimetry in the sheep has been developed. A pulsed-reactor assembly similar to the Los Alamos Scientific Laboratory's GODIVA II was used for these studies. The reactor was pulse operated producing a 50-{mu}s pulse width at half maximum pulse height and a fuel-material temperature rise of about 100 Degree-Sign C. A subcutaneous pack contains a cadmium-covered gold foil, a bare gold foil,and three thermoluminescent glass-rod dosimeters in a glass-lined lithium-lead container. The packs were placed in the subcutaneous tissue on both sides of the body to detect the integrated thermal-neutron flux and gamma dose as the neutrons are delivered ''broadside''. Abdominal packs are prepared in a manner similar to the subcutaneous ones and consist of a boron ball containing cadmium covered fission threshold foils (Pu, Np, U) a sulphur tablet, and the three types of dosimeters included in the subcutaneous pack. The dosimetry pack was placed in the abdomen of the experimental animals eighteen hours before exposure. The pack is attached to the anterior pillar of the rumen. A Rumenotomy technique is described. The neutron dose was determined by means of threshold-foil  More>>
Authors:
Mobley, T. S.; Engel, R. E.; Godden, W. R.; [1]  Penikas, V. T. [2] 
  1. Kirtland Airforce Base, New Mexico (United States)
  2. AFIT, Wright-Patterson Air Force Base, Ohio, with Duty Station at University of Rochester, School of Medicine and Dentistry, Rochester, NY (United States)
Publication Date:
Mar 15, 1964
Product Type:
Conference
Report Number:
IAEA-SM-44/42
Resource Relation:
Conference: Symposium on Biological Effects of Neutron Irradiations, Upton, NY (United States), 7-11 Dec 1963; Other Information: 12 refs., 7 tabs., 2 figs.; Related Information: In: Biological Effects of Neutron and Proton Irradiations. Vol. I. Proceedings of the Symposium on Biological Effects of Neutron Irradiations| 448 p.
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; 63 RADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS; ABDOMEN; ANIMAL TISSUES; BORON; CADMIUM; DEPTH DOSE DISTRIBUTIONS; FAST NEUTRONS; GOLD; NEPTUNIUM 237; NEUTRON DOSIMETRY; PHOTOLUMINESCENCE; PLUTONIUM 239; PULSED REACTORS; RADIATION DOSES; RPL DOSEMETERS; SHEEP; STOMACH; THERMAL NEUTRONS; URANIUM 238
OSTI ID:
22141828
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M3430096429
Submitting Site:
INIS
Size:
page(s) 103-115
Announcement Date:
Oct 24, 2013

Citation Formats

Mobley, T. S., Engel, R. E., Godden, W. R., and Penikas, V. T. In Vivo and Air Dosimetry of Fission-Spectrum Neutrons; Dosimetrie In Vivo et dans l'Air du Spectre des Neutrons de Fission; Dozimetriya v vozdukhe i dozimetriya In Vivo nejtronov spektra deleniya; Dosimetria In Vivo y en el Aire de Neutrones de un Espectro de Fision. IAEA: N. p., 1964. Web.
Mobley, T. S., Engel, R. E., Godden, W. R., & Penikas, V. T. In Vivo and Air Dosimetry of Fission-Spectrum Neutrons; Dosimetrie In Vivo et dans l'Air du Spectre des Neutrons de Fission; Dozimetriya v vozdukhe i dozimetriya In Vivo nejtronov spektra deleniya; Dosimetria In Vivo y en el Aire de Neutrones de un Espectro de Fision. IAEA.
Mobley, T. S., Engel, R. E., Godden, W. R., and Penikas, V. T. 1964. "In Vivo and Air Dosimetry of Fission-Spectrum Neutrons; Dosimetrie In Vivo et dans l'Air du Spectre des Neutrons de Fission; Dozimetriya v vozdukhe i dozimetriya In Vivo nejtronov spektra deleniya; Dosimetria In Vivo y en el Aire de Neutrones de un Espectro de Fision." IAEA.
@misc{etde_22141828,
title = {In Vivo and Air Dosimetry of Fission-Spectrum Neutrons; Dosimetrie In Vivo et dans l'Air du Spectre des Neutrons de Fission; Dozimetriya v vozdukhe i dozimetriya In Vivo nejtronov spektra deleniya; Dosimetria In Vivo y en el Aire de Neutrones de un Espectro de Fision}
author = {Mobley, T. S., Engel, R. E., Godden, W. R., and Penikas, V. T.}
abstractNote = {In an attempt to estimate the depth-dose pattern during exposure to fission-spectrum neutrons, a method of in vivo neutron dosimetry in the sheep has been developed. A pulsed-reactor assembly similar to the Los Alamos Scientific Laboratory's GODIVA II was used for these studies. The reactor was pulse operated producing a 50-{mu}s pulse width at half maximum pulse height and a fuel-material temperature rise of about 100 Degree-Sign C. A subcutaneous pack contains a cadmium-covered gold foil, a bare gold foil,and three thermoluminescent glass-rod dosimeters in a glass-lined lithium-lead container. The packs were placed in the subcutaneous tissue on both sides of the body to detect the integrated thermal-neutron flux and gamma dose as the neutrons are delivered ''broadside''. Abdominal packs are prepared in a manner similar to the subcutaneous ones and consist of a boron ball containing cadmium covered fission threshold foils (Pu, Np, U) a sulphur tablet, and the three types of dosimeters included in the subcutaneous pack. The dosimetry pack was placed in the abdomen of the experimental animals eighteen hours before exposure. The pack is attached to the anterior pillar of the rumen. A Rumenotomy technique is described. The neutron dose was determined by means of threshold-foil measurements. Gold and cadmium-covered gold were used for determining the integrated thermal flux; plutonium-239, neptunium-237, uranium-238 and sulphur-32 for determining the integrated fast-neutron fluxes; and radiophotoluminescent glass rods for determining the gamma dose. The sheep received lateral exposures at a midline distance of two hundred centimeters or one hundred seventy five centimeters from the centre of the critical assembly. The neutron rad dose measured in air at 200 cm was 161 {+-} 5.5 rad; at 175 cm the neutron dose was 242 {+-} 16.6 rad. The gamma dose at the respective distances were 33 {+-}2.4 and 42 {+-} 2.5 r. The entrance and exit doses as well as the dose to the internal package varied with burst temperature rise, distance from the reactor, orientation of the foils with respect to the reactor, and the thickness and composition of the attenuating tissues. (author) [French] En vue d'evaluer la dose profonde du fait de l'exposition au spectre des neutrons de fission, les auteurs ont mis au point une methode de dosimetrie in vivo sur le mouton. On a utilise pour ces etudes un reacteur a flux puise semblable a l'appareil GODIVA II du Laboratoire scientifique de Los Alamos. En regime puise, le reacteur donne une impulsion d'une largeur de 50 {mu}s a la moitie du maximum d'amplitude pour une elevation de temperature du combustible d'environ 100 Degree-Sign C. Une insertion sous-cutanee contient une feuille d'or recouverte de cadmium, une feuille d'or nue et trois dosimetres en verre thermoluminescent places dans un etui de lithium et de plomb double de verre. On a place les insertions dans le tissu sous-cutane des deux cotes du corps pour detecter la dose totale de neutrons thermiques-gamma, les neutrons etant delivres sur les flancs. Des insertions abdominales sont preparees a peu pres de la meme facon que les insertions sous-cutanees; elles sont constituees d'une boule de bore contenant des feuilles a seuil de fission (Pu, Np, Ue) recouvertes de cadmium, d'un comprime de soufre et de trois dosimetres identiques a ceux des insertions sous-cutanees. On les a placees dans l'abdomen des sujets 18 h avant l'exposition, en les fixant au pilier anterieur du rumen. Les auteurs decrivent un procede de rumenotomie. On a determine la dose de neutrons au moyen de la feuille a seuil. On a utilise les feuilles d'or et les feuilles d'or recouvertes de cadmium pour determiner le flux integre de neutrons thermiques, le plutonium-239, le neptumum-237, l'uranium-238 et le soufre-32 pour determiner le flux integre de neutrons rapides, et les batonnets de verre radiophotoluminescents pour determiner la dose gamma. Les moutons ont subi des expositions laterales a une distance mediane de 200 cm ou de 175 cm du centre de l ' assemblage critique. La dose de neutrons mesuree dans l ' air etait de 161 {+-} 5 ,5 rad a 200 cm et de 242 {+-} 16.6 rad a 175 cm. A ces distances, la dose gamma etait respectivement de 33 {+-} 2,4 et 42 {+-} 2,5 r. Les doses d'entree et de sortie ainsi que la dose a l ' insertion variaient selon l'elevation de temperature due aux bouffees de neutrons, la distance du reacteur, l 'orientation des feuilles par rapport au reacteur et l'epaisseur et la composition de tissus attenuants. (author) [Spanish] Con el proposito de evaluar la configuracion de la dosis profunda durante la exposicion a neutrones de un espectro de fisionalos autores han ideado un metodo de dosimetria neutronica in vivo que aplicaron a ovejas. Utilizaron para estos estudios un reactor pulsante analogo al GODIVA II del Laboratorio Cientifico de Los Alamos. Dicho conjunto funciona de forma de producir impulsos de 50 {mu}s de amplitud, medida a la mitad de la altura maxima, y un ascenso de temperatura del combustible de unos 100 Degree-Sign C. Ademas, prepararon 'apositos ' subcutaneos que contienen una lamina de oro recubierta de cadmio, una lamina de oro sin recubrir y tres dosimetros de varilla de vidrio, termoluminiscentes, en un recipiente de plomo al litio revestido de vidrio. Estos apositos se introdujeron en el tejido subcutaneo, a ambos lados del cuerpo, y sirvieron para medir el flujo integrado de neutrones termicos y la dosis gamma, a medida que la irradiacion neutronica se aplica 'lateralmente'. Los apositos abdominales se prepararon en forma semejante a los subcutaneos; constan de una esfera de boro que contiene laminas de umbral de fision (Pu, Np, U) recubiertas de cadmio, una pastilla de azufre y los mismos tres tipos de dosimetros que forman parte del aposito subcutaneo. El aposito dosimetrico se sujeto al pilar anterior del rumen del animal 18 h antes de someterlo a la exposicion. En la memoria se describe la tecnica de rumenotomfa empleada. La dosis neutronica se determina mediante laminas de umbral. Para medir el flujo integrado de neutrones termicos, se utilizaron las laminas de oro y de oro recubierto de cadmio; para el flujo integrado de neutrones rapidos, se recurrio al plutonio-239, al neptunio-237, al uranio-238 y al azufre-32; la dosis gamma se determino con varillas de vidrio radiofotoluminiscentes. Las ovejas fueron sometidas a exposiciones laterales, a una distancia de linea media de 200 o 175 cm del centro del conjunto critico. La dosis neutronica medida en el aire, a 200 cm, fue 161 {+-} 5 ,5 rad; y a 175 cm, fue 242 {+-} 16,6 rad. A las mismas distancias, la dosis gamma fue, respectivamente, 33 {+-} 2,4 y 42 {+-}2,5 r. Las dosis de entrada y salida, asi como la dosis recibida por el aposito interno varian con el ascenso de temperatura, la distancia al reactor, la orientacion de las laminas con respecto a este y el espesor y composicion de los tejidos atenuadores. (author) [Russian] Dlja opredelenija glubinnoj dozy vo vremja obluchenija nejtronami spektra delenija na ovcah razrabotan metod dozimetrii nejtronov in vivo. Dlja issledovanij ispol'zovalas impul'snaja reaktornaja sborka podobnaja sborke Godiva I I Los-Alamosskoj nauchnoj laboratorii. Reak tor rabotal v impul'snom rezhime, proizvodja impul'sy prodolzhitel'nost'ju 50 mksek shirinoj v polovinu vysoty maksimal'nogo impul'sa, prichem temperatura toplivnogo materiala povyshalas' primerno do 100 Degree-Sign S. Podkozhnyj detektor soderzhal kadmij, pokrytyj zolotoj fol'goj, prostuju zolotuju fol'gu i tri stekljannyh termoljuminescentnyh sterzhnevyh dozimetra v stekljannom kontejnere, vylozhennom litiem i svincom. Jeti detektory pomeshhalis' v podkozhnoj tkani po obeim storonam tela dlja obnaruzhenija integrirovannogo potoka teplovyh nejtronov i gamma-dozy, tak kak potoki nejtronov napravljalis' sboku. Detektory dlja brjushnoj polosti byli podgotovleny takim zhe obrazom, kak i dlja podkozhnogo vvedenija, i sostojali iz bornogo sharika, soderzhashhego kadmij i pokrytogo fol'goj poroga delenija (Pu, Np, U), sernoj tabletki i treh tipov dozimetrov, primenjavshihsja v podkozhnom detektore. Dozimetricheskij pribor pomeshali v brjushnoj polosti podopytnyh zhivotnyh za vosemnadcat' chasov do obluchenija, prikrepljaja e go k perednej storone rubcevogo otdela zheludka. Opisyvaetsja metod rassechenija rubcevogo otdela zheludka. Doza nejtronov izmerjalas' s pomoshh'ju porogovyh izmerenij fol'gi. Zoloto i zoloto, pokrytoe kadmiem, ispol'zovalis' dlja opredelenija integrirovannogo potoka teplovyh nejtronov; plutonij-239, neptunij-237, uran-238 i sera-32 - dlja opredelenija integrirovannyh potokov bystryh nejtronov; radiofotoljuminiscentnye stekljannye sterzhni - dlja opredelenija dozy gamma-luchej. Ovcu podvergali oblucheniju sboku na rasstojanii (po srednej linii) 200 cm, ili 175 sm ot centra kriticheskoj sborki. Doza nejtronov v radah, izmerennaja v vozduhe na rasstojanii 200 sm sostavljala 161 {+-}5,5 rada; na rasstojanii 175 sm - 242 {+-} 16,6 rada. Doza gamma-luchej na sootvetstvujushhih rasstojanijah so stavljala 3 3 {+-}2 ,4 i 4 2 {+-}2 ,5 rentgena. Dozy na vhode i vyhode, a takzhe doza vo vnutrennem detektore kolebalas' v svjazi s vnezapnym pod{sup e}mom temperatury, uvelicheniem rasstojanija ot reaktora, polozheniem fol'gi v otnoshenii reaktora i zavisela ot tolshhiny i sostava oslabljajushhih dozu tkanej. (author)}
place = {IAEA}
year = {1964}
month = {Mar}
}