Apparatus for processing nuclear emulsions

Bujdosó, E.; Medveczky, L.

doi:10.1016/0369-643x(58)90038-0

Cited by 3 publications

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References 12 publications

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“…The minimum of other seattering materials in the room was 110 cm. The nuclear emulsions were processed by temperature-development with amidol [12]. To reduce the shrinkage factor, ah aqueous solution of 10% glycerin was applied.…”

Section: Exposure Of the Platesmentioning

confidence: 99%

The energy of neutrons from the reaction Be9(α,n)C12

Medveczky

1963

Acta Phys. Hung.

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Presented by A. Szalay. --Rcceivcd 21. II. 1963) 9 210 1 s ce The nuclear reaction was produced by Po a pha-our .The energy of the neutrons was measured by the photoemulsion method in d.irection of 30 o, 90 o, 120 o, 150 ~ and 180 ~ (in the laboratory system). The differential cross section for formation of the 4,433 MeV state was found to be 56; 24; 25; 29; and 30 mb/sr • 20,4~o respectively, in the above-mentioned five directions.There are a great many reports [1] on the nuclear reaction Beg(a, n)C 12. Several workers investigated the dependence of the intensity of radiations from the nuclear reaction on the energy of a-particles producing the reaction~ The shape of the excitation curves is very similar for photons and neutrons, both showing marked resonances characteristic of the formation of the compound nucleus.MeV level of the nucleus C 12 by means of a direct reaction mechanism, although the possibility for the formation of a compound nucleus is not excluded either.Interestingly, when a-particles of higher energy are concerned (9 < Ea < 14 MeV), the angular distribution of these neutrons greatly varies at different . This may be caused by the formation of a compound nucleus. The angular distribution belonging to the ground state and second energy level of C 12 hardly changes in a wide energy region, which is due to a direct nuclear reaction mechanism in addition to identical values of spin and parity (o+).Investigations with a-particles of Ea = 5,3 MeV energy, which we also applied in the study reported here, were made only by GUIER, BERTI~I ar.d ~4cta Phys. Hung. Toro. XVI. Fasc. 2.

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Section: Exposure Of the Platesmentioning

confidence: 99%

The energy of neutrons from the reaction Be9(α,n)C12

Medveczky

1963

Acta Phys. Hung.

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Range of protons in the Agfa K2 nuclear emulsion

Medveczky

Somogyi

1961

Acta Phys. Hung.

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Presentcd by A. Szalay. --Receivcd 11. XI. 1960) By measuring the range-energy curve of recoil protons produced in the nuclear emulsion by reactions H2(d, n) He a and Ha(d, n) He 4, calibration points were obtained to determine the range-energy relation of the Agfa K2 emulsion. The measured ranges showed good agreement within the error limits with results of calculations for Agfa K2 emulsion containing 60~o relative humidity [1].The photoemulsion method cannot be applied to determine the energy of particles without precise knowledge of their range-energy relation. Therefore it is not surprising that in the literature such a great number of both calculated and measured data can be found on emulsions of different make and type.The range-energy relation of Agfa K2 emulsions was investigated by LxNIvs [2] and BEBEL [1]. Both authors carried out calculations for protons, and obtained the calibration points by measuring and reducing the range of alpha-particles from the decay series of Th. Experimental data on protons were reported only by LANIus, who measured the range of 0,58 MeV protons from the reaction N 14 (n,p) C 14. Both measurements were made in air of 60~ relative humidity, and the calculations were also made for emulsions of this kind. There is a substantial difference in the atomic composition reported by the two authors and accordingly also in the density of emulsions. According to BEBEL'S recerit data the latter is 3,38 gcm --3 as against the previous 3,84 gcm -3. LANIUS carried out the calculations as described by C•[3], while BEBEL made them with the method developed by VIGNERON [4] using --in addition to the composition of the emulsion --new data also for the average ionization potential value.On the basis of the above it can be expected and also understood that the discrepancy in the range of protons with identical energy is considerably greater between the data of the two authors referred to than the usual error in measurement. The data of measurement and calculated values of both authors --on the other hand --show good agreement. The reason for this, besides the use of emulsions with different stopping power, is to be found in the fact that

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Apparatus for the development of nuclear emulsion plates

Lohmann¹

1959

Nuclear Instruments and Methods

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Apparatus for processing nuclear emulsions

Cited by 3 publications

References 12 publications

The energy of neutrons from the reaction Be9(α,n)C12

The energy of neutrons from the reaction Be9(α,n)C12

Range of protons in the Agfa K2 nuclear emulsion

Apparatus for the development of nuclear emulsion plates

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