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Title: Activation product analysis in a mixed sample containing both fission and neutron activation products

Abstract

Activation analysis of gold (Au) is used to estimate neutron fluence resulting from a criticality event; however, such analyses are complicated by simultaneous production of other gamma-emitting fission products. Confidence in neutron fluence estimates can be increased by quantifying additional activation products such as platinum (Pt), tantalum (Ta), and tungsten (W). This work describes a radiochemical separation procedure for the determination of these activation products. Anion exchange chromatography is used to separate anionic forms of these metals in a nitric acid matrix; thiourea is used to isolate the Au and Pt fraction, followed by removal of the Ta fraction using hydrogen peroxide. W, which is not retained on the first anion exchange column, is transposed to an HCl/HF matrix to enhance retention on a second anion exchange column and finally eluted using HNO3/HF. Chemical separations result in a reduction in the minimum detectable activity by a factor of 287, 207, 141, and 471 for 182Ta, 187W, 197Pt, and 198Au respectively, with greater than 90% recovery for all elements. These results represent the highest recoveries and lowest minimum detectable activities for 182Ta, 187W, 197Pt, and 198Au from mixed fission-activation product samples to date, enabling considerable refinement in the measurement uncertainties formore » neutron fluences in highly complex sample matrices.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1426364
Report Number(s):
PNNL-SA-119557
Journal ID: ISSN 0236-5731; DN2003000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Radioanalytical and Nuclear Chemistry
Additional Journal Information:
Journal Volume: 314; Journal Issue: 3; Journal ID: ISSN 0236-5731
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
gold; platinum; tantalum; tungsten; anion exchange; Gamma spectroscopy

Citation Formats

Morrison, Samuel S., Clark, Sue B., Eggemeyer, Tere A., Finn, Erin C., Hines, C. Corey, King, Mathew D., Metz, Lori A., Morley, Shannon M., Snow, Mathew S., Wall, Donald E., and Seiner, Brienne N. Activation product analysis in a mixed sample containing both fission and neutron activation products. United States: N. p., 2017. Web. doi:10.1007/s10967-017-5563-9.
Morrison, Samuel S., Clark, Sue B., Eggemeyer, Tere A., Finn, Erin C., Hines, C. Corey, King, Mathew D., Metz, Lori A., Morley, Shannon M., Snow, Mathew S., Wall, Donald E., & Seiner, Brienne N. Activation product analysis in a mixed sample containing both fission and neutron activation products. United States. doi:10.1007/s10967-017-5563-9.
Morrison, Samuel S., Clark, Sue B., Eggemeyer, Tere A., Finn, Erin C., Hines, C. Corey, King, Mathew D., Metz, Lori A., Morley, Shannon M., Snow, Mathew S., Wall, Donald E., and Seiner, Brienne N. Thu . "Activation product analysis in a mixed sample containing both fission and neutron activation products". United States. doi:10.1007/s10967-017-5563-9.
@article{osti_1426364,
title = {Activation product analysis in a mixed sample containing both fission and neutron activation products},
author = {Morrison, Samuel S. and Clark, Sue B. and Eggemeyer, Tere A. and Finn, Erin C. and Hines, C. Corey and King, Mathew D. and Metz, Lori A. and Morley, Shannon M. and Snow, Mathew S. and Wall, Donald E. and Seiner, Brienne N.},
abstractNote = {Activation analysis of gold (Au) is used to estimate neutron fluence resulting from a criticality event; however, such analyses are complicated by simultaneous production of other gamma-emitting fission products. Confidence in neutron fluence estimates can be increased by quantifying additional activation products such as platinum (Pt), tantalum (Ta), and tungsten (W). This work describes a radiochemical separation procedure for the determination of these activation products. Anion exchange chromatography is used to separate anionic forms of these metals in a nitric acid matrix; thiourea is used to isolate the Au and Pt fraction, followed by removal of the Ta fraction using hydrogen peroxide. W, which is not retained on the first anion exchange column, is transposed to an HCl/HF matrix to enhance retention on a second anion exchange column and finally eluted using HNO3/HF. Chemical separations result in a reduction in the minimum detectable activity by a factor of 287, 207, 141, and 471 for 182Ta, 187W, 197Pt, and 198Au respectively, with greater than 90% recovery for all elements. These results represent the highest recoveries and lowest minimum detectable activities for 182Ta, 187W, 197Pt, and 198Au from mixed fission-activation product samples to date, enabling considerable refinement in the measurement uncertainties for neutron fluences in highly complex sample matrices.},
doi = {10.1007/s10967-017-5563-9},
journal = {Journal of Radioanalytical and Nuclear Chemistry},
issn = {0236-5731},
number = 3,
volume = 314,
place = {United States},
year = {2017},
month = {11}
}