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Title: Determination of Volatility and Element Fractionation in Glassy Fallout Debris by SIMS

Abstract

The purpose of this report is to characterize glassy fallout debris using the Trinity Test and then characterize the U-isotopes of U 3O 8 reference materials that contain weaponized debris.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1253483
Report Number(s):
LA-UR-16-23310
TRN: US1601374
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; TRINITY EVENT; ION MICROPROBE ANALYSIS; MASS SPECTROSCOPY; URANIUM OXIDES U3O8; FRACTIONATION; FALLOUT; URANIUM ISOTOPES; VOLATILITY; PARTICLES; GLASS; NUCLEAR WEAPONS; CALIBRATION STANDARDS

Citation Formats

Williamson, Todd L., Tenner, Travis Jay, Bonamici, Chloe Elizabeth, Kinman, William Scott, Pollington, Anthony Douglas, and Steiner, Robert Ernest. Determination of Volatility and Element Fractionation in Glassy Fallout Debris by SIMS. United States: N. p., 2016. Web. doi:10.2172/1253483.
Williamson, Todd L., Tenner, Travis Jay, Bonamici, Chloe Elizabeth, Kinman, William Scott, Pollington, Anthony Douglas, & Steiner, Robert Ernest. Determination of Volatility and Element Fractionation in Glassy Fallout Debris by SIMS. United States. doi:10.2172/1253483.
Williamson, Todd L., Tenner, Travis Jay, Bonamici, Chloe Elizabeth, Kinman, William Scott, Pollington, Anthony Douglas, and Steiner, Robert Ernest. 2016. "Determination of Volatility and Element Fractionation in Glassy Fallout Debris by SIMS". United States. doi:10.2172/1253483. https://www.osti.gov/servlets/purl/1253483.
@article{osti_1253483,
title = {Determination of Volatility and Element Fractionation in Glassy Fallout Debris by SIMS},
author = {Williamson, Todd L. and Tenner, Travis Jay and Bonamici, Chloe Elizabeth and Kinman, William Scott and Pollington, Anthony Douglas and Steiner, Robert Ernest},
abstractNote = {The purpose of this report is to characterize glassy fallout debris using the Trinity Test and then characterize the U-isotopes of U3O8 reference materials that contain weaponized debris.},
doi = {10.2172/1253483},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 5
}

Technical Report:

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  • A simplified, semi-theoretical model of fractionation is presented that is suitable for making interim estimates of degree of fractionation and of radionuclide partition between local, intermediate, and worldwide fallout. The principles set forth are applicable to the treatment of air-, tower-, and surface- burst debris (in the order of decreasing confidence) and to correcting fallout- prediction systems for fractionation effects. (auth)
  • This report illustrates a proposed definition of surface density of contamination for the deposit of fractionated fallout. The illustrations employed give estimates of the dependence of exposure-dose rate on the degree of radionuclide fractionation and of the sensitivity of this dependence to independent fission yield input data, total yield of the device, and time of exposure. (auth)
  • Five silicate fallout glass spherules produced in a uranium-fueled, near-surface nuclear test were characterized by secondary ion mass spectrometry, electron probe microanalysis, autoradiography, scanning electron microscopy, and energy-dispersive x ray spectroscopy. Several samples display distinctive compositional heterogeneity suggestive of incomplete mixing, and exhibit heterogeneity in U isotopes with 0.02 < 235U/ 238U < 11.8 among all five samples and 0.02 < 235U/ 238U < 7.81 within a single sample. In two samples, the 235U/ 238U ratio is correlated with major element composition, consistent with the agglomeration of chemically and isotopically distinct molten precursors. Twomore » samples are quasi-homogeneous with respect to composition and uranium isotopic composition, suggesting extensive mixing possibly due longer residence time in the fireball. Correlated variations between 234U, 235U, 236U and 238U abundances point to mixing of end-members corresponding to uranium derived from the device and natural U ( 238U/ 235U = 0.00725) found in soil.« less
  • This project investigated the application of X-ray CT for characterizing fallout glasses.