ON THE SENSITIVITY AND REGRESSION OF SILVER BROMIDE IN IODIDE NUCLEAR EMULSIONS

Journal Article · Thu Jan 01 04:00:00 EST 1959 · Ceskoslov. casopis pro fysiku

OSTI ID:4155706

Kubal, J; Benes, J; Hrkal, Z

An investigation was made of the effective addition of silver iodide (0 to 8 M%) on the sensitivity (S) of nuclear silver bromide photoemulsions containing CdBr/sub 2/ to improve the homogeneity of the microcrystals by dimension. The emulsions were exposed to light and particles ( alpha from Po/ sup 210/ and beta from C/sup 14/). Adding up to 3% AgI reduces 8 relative to the light and alpha particles. Further increase of the concentration of silver bromide first reduces S to light, but after 5.5M it again increases it. With respect to beta particles, the value of S is constant up to 3% silver bromide; it then drops and again remains constant after 5.5%. In individual traces of particles at a concentration of silver bromide above 4% there is noted an increase in grain size with the corresponding deterioration of the discrimination. A sensitization by 2-paradimethyl aminostyril benzothiazols (I) increases S (more to light than to particles). but does not influence the character of the dependence of S on the concentration of silver bromide. Also studied was the speed of regression at the same emulsions at temperatures 4 and 18 C. After sensitization with I, the regression increases for the action of light and decreases for the action of particles; this law is independent of the presence of silver bromide in the emulsion. To explain tbis law it is proposed that I acts only on the surface development centers, the number of sites of which are different for light and for particles. The rate of regression in AgBr + AgI emulsions is less than in pure silver bromide emulsions, and under the action of alpha particles it is substantially less than under the action of electrons. Hypersensitization with triethanol amine after sensitization with I increases S considerably to electrons: a low sensitive nuclear emulsion acquires ability of registering individual tracks of beta particles from C/sup 14/, and when estimated by a blackening density of 0.6 over fog, S increases by a factor of more than ten.

• Research Organization: Charles Univ., Prague
• NSA Number: NSA-14-024278
• OSTI ID: 4155706
• Journal Information: Ceskoslov. casopis pro fysiku, Journal Name: Ceskoslov. casopis pro fysiku Vol. Vol: 9, No. 2
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
AMINES
AROMATICS
BETA PARTICLES
CADMIUM BROMIDES
CHARGED PARTICLES
EFFICIENCY
ELECTRONS
ENGINEERING AND EQUIPMENT
ETHANOL
GRAIN SIZE
IMAGES
ISOMERS
LIGHT
NUCLEAR EMULSIONS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PARTICLE TRACKS
SENSITIVITY
SILVER BROMIDES
SILVER IODIDES
TEMPERATURE