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Study of the effect of positive ions impinging sensitive emulsions in mass spectrography; Etude de l'action des ions positifs sur les emulsions sensibles en spectrographie de masse

Abstract

Experimental relationships have been established between the blackening of emulsions by impinging ions and the following parameters: number, mass and energy of impinging particles. Mean energy ions (about twenty keV) give rise to a latent image probably made of small specks of metallic silver located at the surface or in the bulk of the silver halide grain. A specific developer for ion sensitive emulsion was perfected. Sensitivity and detection threshold are increased by a factor of two or three, compared with values observed using a classical developer. Low energy particles sputtered from superficial layers of the emulsion by the impinging twenty keV ions, produce a latent image close to the surface of the silver halide grain. An oxidizing process bleaches superficial latent image and then reduces background fog. The improved signal over background ratio allows to observe lines undetectable when the plates are developed by usual process. (author) [French] On a etabli les relations experimentales entre le noircissement resultant de l'action des ions sur l'emulsion sensible et les parametres suivants: nombre de particules incidentes, masse et energie de ces particules. L'effet sur les grains d'halogenure d'argent a ete examine: les ions d'energie moyenne (de l'ordre de 20 keV) creent une  More>>
Authors:
Cavard, A [1] 
  1. Commissariat a l'Energie Atomique, Grenoble (France). Centre d'Etudes Nucleaires
Publication Date:
Aug 01, 1969
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-3759
Resource Relation:
Other Information: TH: These docteur es sciences physiques; 112 refs; PBD: Aug 1969
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DEVELOPERS; ENERGY DEPENDENCE; GELATIN; ION DENSITY; LATENT IMAGES; MASS SPECTRA; MASS SPECTROSCOPY; OPACITY; OXIDATION; PENETRATION DEPTH; PH VALUE; PHOTOGRAPHIC EMULSIONS; POTASSIUM COMPOUNDS; SENSITIVITY; SIGNAL-TO-NOISE RATIO; SILVER COMPOUNDS; SODIUM COMPOUNDS; SPARK MASS SPECTROMETERS; THIOCYANATES
OSTI ID:
20528757
Research Organizations:
CEA Grenoble, 38 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3759095023
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[113] pages
Announcement Date:

Citation Formats

Cavard, A. Study of the effect of positive ions impinging sensitive emulsions in mass spectrography; Etude de l'action des ions positifs sur les emulsions sensibles en spectrographie de masse. France: N. p., 1969. Web.
Cavard, A. Study of the effect of positive ions impinging sensitive emulsions in mass spectrography; Etude de l'action des ions positifs sur les emulsions sensibles en spectrographie de masse. France.
Cavard, A. 1969. "Study of the effect of positive ions impinging sensitive emulsions in mass spectrography; Etude de l'action des ions positifs sur les emulsions sensibles en spectrographie de masse." France.
@misc{etde_20528757,
title = {Study of the effect of positive ions impinging sensitive emulsions in mass spectrography; Etude de l'action des ions positifs sur les emulsions sensibles en spectrographie de masse}
author = {Cavard, A}
abstractNote = {Experimental relationships have been established between the blackening of emulsions by impinging ions and the following parameters: number, mass and energy of impinging particles. Mean energy ions (about twenty keV) give rise to a latent image probably made of small specks of metallic silver located at the surface or in the bulk of the silver halide grain. A specific developer for ion sensitive emulsion was perfected. Sensitivity and detection threshold are increased by a factor of two or three, compared with values observed using a classical developer. Low energy particles sputtered from superficial layers of the emulsion by the impinging twenty keV ions, produce a latent image close to the surface of the silver halide grain. An oxidizing process bleaches superficial latent image and then reduces background fog. The improved signal over background ratio allows to observe lines undetectable when the plates are developed by usual process. (author) [French] On a etabli les relations experimentales entre le noircissement resultant de l'action des ions sur l'emulsion sensible et les parametres suivants: nombre de particules incidentes, masse et energie de ces particules. L'effet sur les grains d'halogenure d'argent a ete examine: les ions d'energie moyenne (de l'ordre de 20 keV) creent une image latente vraisemblablement constituee d'argent, situee a la fois a la surface et a l'interieur du grain. Un revelateur specifique pour le developpement des emulsions sensibles exposees aux ions a ete mis au point: il accroit la sensibilite d'un facteur deux a trois et le facteur de contraste par rapport a un revelateur usuel. Les particules de faible energie, emises par pulverisation des couches superficielles de l'emulsion au cours de l'enregistrement des spectres de masse des ions d'energie moyenne, creent essentiellement dans les grains d'halogenure d'argent, une image latente superficielle, responsable du fond. Un traitement oxydant est propose pour eliminer cette image en attaquant peu l'image interne: on ameliore ainsi le rapport signal/bruit de fond. Des traces d'impuretes non decelables par un developpement usuel des emulsions deviennent dosables. (auteur)}
place = {France}
year = {1969}
month = {Aug}
}