Bremsstrahlung Cross Section of 60-Mev Electrons in Lead

Curtis, C. D.

doi:10.1103/physrev.89.123

Cited by 16 publications

(2 citation statements)

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“…For instance, Krohn and Shrader 6 report a slight excess of photons in the high-energy end of the spectrum (for E/E m =0. 8, where E is the photon energy and E m the initial energy of the radiating electron), while Koch and Carter 2 find an excess in the region E/E m -0.5. In most cases, the spectral intensity has been normalized at an arbitrary energy.…”

Section: Cs 136mentioning

confidence: 97%

“…The observed total intensity is that indicated by monitoring using an "R" thimble imbedded in 3.9 cm of Lucite. The methods used have depended upon the detection of: the primary electrons after radiation 8,10 ; the secondary electrons from processes such as pair production 2-5 -12 and Compton scattering 9 ; and the secondary protons from the photodisintegration of the deuteron. 1 ' 6,7,11 The detectors used in the first three methods have been either magnetic spectrometers or magnetic cloud chambers, while the photoprotons from deuterium have in all such cases been detected in photographic emulsions.…”

Section: Cs 136mentioning

confidence: 99%

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Bremsstrahlung Spectrum from the Internal Target of a 22-Mev Betatron

Weinstock

Halpern

1955

Phys. Rev.

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1293to decay 24 ; silver was then separated. For the determination of Ag 115 , AgCl was precipitated from the initial target solution within ten minutes of bombardment. The precipitate was dissolved in the presence of cadmium carrier, the cadmium daughter activities were later purified and counted. Silver was separated as the chloride, iodide, sulfide, and the metal (using ascorbic acid in dilute NH 4 OH solution). Iodide carrier was added during the Ag2S precipitate and an Fe(OH) 3 scavenge was used. A scattering factor of 1.2 has been assumed for Ag 112 and Ag 113 . The 0.001inch uranium targets used to determine Ag 112 and Ag 113 had no uranium guard foils, so a correction of 10 percent was added to the observed value for loss by recoils. 6 The Ag 112 and Ag 113 activities were resolved analytically 4 after subtraction of the Ag 111 activity from the gross decay curve. Cd 115 , Cd 115wThe independent yields of these nuclides were determined by a rapid separation of AgCl from the target solution within ten minutes of bombardment. The Cd 115 and Cd 115m activities were separated from the supernatant solution. Total mass 115 yields were also measured by determining the Cd 115 and Cd 115w in day-old targets. Cadmium was separated as the sulfide from the uranium target solution after the uranium had been complexed with acetic acid and the pH adjusted to about 5. Scavenges of Sb2S3 from 2N HC1 and Fe(OH) 3 from NH 4 OH solution were performed and the cadmium precipitated as the sulfide from an NH4OH solution. The CdS was dissolved in IN HC1 and placed on a Dowex A-l column. The column was washed with 0.1N HC1 and the cadmium eluted with 1.5M H2SO4. CdS precipitated from the H2SO4 solution was weighed and mounted for counting. Cs 136After the niobium had been precipitated with nitric acid, the supernatant solution was fumed with HCIO4 and the cesium perchlorate precipitated with ethyl acetate. Cesium silicotungstate Cu 67 fn Cu° on Pt Nb 96 In Nb205 on AI 24 H. G. Hicks and R. S. Gilbert, Phys. Rev. 94, 371 (1954). 10 20 30 mg/cm 2 (E)FIG. 8. Empirical corrections of counting data for the combined effects of self-scattering, self-absorption, and saturation back scattering. 24 was precipitated four times. The final sample was prepared as CSCIO4.The intensity and energy distribution of the bremsstrahlung photons produced in a betatron operating at 22 Mev have been determined by measurement of the energy spectrum of photoprotons ejected from deuterium. The protons were detected using a 0.15 cm thick Nal crystal followed by a 100-channel pulseheight analyzer. The photon beam was highly collimated in the forward direction. If one assumes the energy dependence of the cross section for the photodisintegration of deuterium as given by Hulth6n, the computed bremsstrahlung energy distribution is in excellent agreement with the theoretical thin-target spectrum. The observed total intensity is that indicated by monitoring using an "R" thimble imbedded in 3.9 cm of Lucite.

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Section: Cs 136mentioning

confidence: 97%

Section: Cs 136mentioning

confidence: 99%