(MLH)Īngular correlations in the prompt neutron emission in spontaneous fission of 252Cf The students prepare decay curves of the radioactive isotopes and perform nondestructive activation analyses for gram amounts of some elements. Fission fragments may also self-transfer, and sources made by self-transfer may need some decay time to reach radioactive equilibrium.Ī Californium- 252 Neutron Source for Student UseĮRIC Educational Resources Information Centerĭescribes an undergraduate chemistry experiment which utilizes small samples of Californium 252 as a neutron source for the activation of 12 other elements. Results indicate that self-transfer sources exhibit less alpha energy straggling and energy loss than evaporative sources. The sources were analyzed by alpha and gamma spectroscopy. Thin film sources containing Cf- 252 were prepared by two techniques: evaporation and self-transfer. Alexander, Charles W.Ĭalifornium- 252 (Z = 98) is valued as a potent neutron source due to its spontaneous fission decay path. The average γ-ray multiplicity is found to be rather weakly dependent on the number of neutrons emitted in the fission process.Ĭomparison of Cf- 252 thin-film sources prepared by evaporation or self-transferĪlgutifan, Noor J. We do not observe the enhancement in the yields of events with high neutron emission multiplicity (νn > 7) that has been associated to a second fission mode leading to the production of hyperdeformed Ba fragments, as reported in some earlier studies. Prompt γ -ray multiplicities were also measured as a function of the number of neutrons emitted in the fission process leading to the Mo-Ba partition.
Measurements of fission fragment yields and neutron multiplicities have been carried out for the Mo-Ba fragment pairs in the spontaneous fission of 252Cf, using the γ-ray spectroscopy technique to analyze γ-γ-γ coincidence data. Study of the Mo-Ba partition in 252Cf spontaneous fissionīiswas, D. The evolution of radiotherapy using californium 252 is reviewed. Various experiments and inventions involving Cf conducted at the Savannah River Plant are discussed. This isotope may be synthesized by irradiating plutonium 239, plutonium 242, americium 243, or curium 244 with neutrons in a nuclear reactor. This paper discusses the discovery and history of californium 252. Historical Review of Californium- 252 Discovery and Development Various experiments and inventions involving /sup 252/Cf conducted at the Savannah River Plant are discussed. Historical review of californium- 252 discovery and development These spectra both show good agreement with the current evaluation of 252Cf and have low associated uncertainties providing a new high precision measurement that helps reduce the uncertainties in the prompt fission neutron spectrum for the spontaneous fission of 252Cf. An EJ-301 liquid scintillator fast neutron detector was used to measure the high energy portion of the spectrum, 0.5-7 MeV, and a thin EJ-204 plastic scintillator was used to measure the low energy portion of the spectrum, from 50 keV to 2 MeV. The prompt fission neutron spectrum for the spontaneous fission of 252Cf was measured at Rensselaer Polytechnic Institute using the multiple γ tagging method with a 18.4-ng fission sample. Therefore, reducing the uncertainties in this spectrum will allow for more accurate nuclear data to be available across a wide range of fields. Not only is the spectrum itself of interest, but neutron detectors often use the spectrum for calibration, and other prompt fission neutron spectra are measured as a ratio to 252Cf. The prompt fission neutron spectrum from spontaneous fission of 252Cf is an integral part of several aspects of nuclear data. Measurement of prompt fission neutron spectrum for spontaneous fission of 252Cf using γ multiplicity taggingīlain, E. Californium- 252: a remarkable versatile radioisotopeĭOE Office of Scientific and Technical Information (OSTI.GOV)Ī product of the nuclear age, Californium- 252 (Cf from ORNL is summarized herein.« less
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