Improved protactinium spike calibration method applied to 231Pa–235U age-dating of certified reference materials for nuclear forensics

Treinen, Kerri C.; Gaffney, Amy M.; Rolison, John M.; Samperton, Kyle M.; McHugh, Kelly; Miller, Mark M.; Williams, Ross W.

doi:10.1007/s10967-018-6149-x

Cited by 11 publications

(14 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Radiochronometry analyses at LLNL use ultra-high purity acids and water purified to > 18.2 MΩ for labware cleaning and analytical dilutions. The procedure used in this study follows the method outlined in detail in Treinen et al [6].…”

Section: Methodsmentioning

confidence: 99%

“…Th and Pa concentrations were measured on the same aliquot via isotope dilution mass spectrometry. Weighed sample aliquots were spiked with a high-purity nuclear forensic reference material (NFRM) 229 Th spike [7] and a 233 Pa spike that is produced by separation of 233 Pa from a 20-60 mg 237 Np parent solution; the resulting 233 Pa spike is calibrated with a 231 Pa high purity standard [8] before use (see [6] for a more detailed discussion of 233 Pa spike production and calibration). Th and Pa are then separated using a series of anion, TEVA, and silica gel purifications to produce analytical aliquots free of uranium (key for protactinium analyses, where the continual production of 233 U from decay of the 233 Pa spike must be minimized for accurate results).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

230Th-234U and 231Pa-235U radiochronometry of hydrolyzed uranium hexafluoride gas

Harrison

Gaffney

2021

J Radioanal Nucl Chem

Self Cite

View full text Add to dashboard Cite

Radiochronometry analyses of three hydrolyzed UF 6 gas samples were performed using the 230 Th-234 U and 231 Pa-235 U chronometers. All 230 Th-234 U model ages are younger than, and two of the three 231 Pa-235 U model ages overlap with, the known UF 6 gas transfer dates. The 230 Th-234 U discordance is caused by 8-10% 230 Th loss relative to the measurement reference date, likely during alkali hydrolysis. These results confirm that UF 6 gas transfers effectively purify uranium from daughter progeny. Daughter progeny fractionation can occur if solutions are not kept within optimal conditions post-UF 6 gas transfer and hydrolysis, and discordance between the 230 Th-234 U and 231 Pa-235 U chronometers may result from the laboratory procedures used to prepare samples.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

230Th-234U and 231Pa-235U radiochronometry of hydrolyzed uranium hexafluoride gas

Harrison

Gaffney

2021

J Radioanal Nucl Chem

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ketika bahan nuklir dimurnikan saat proses produksi, kotoran dihilangkan (termasuk isotop anak luruhnya), setelah itu produk peluruhan mulai tumbuh dalam bahan melalui peluruhan radioaktif. [8], [9].…”

Section: Pendahuluanunclassified

Penentuan Umur Yellow Cake Secara Radiokronometri

Noerpitasari

Fatimah²,

Haryati³

et al. 2020

urania

View full text Add to dashboard Cite

PENENTUAN UMUR YELLOW CAKE SECARA RADIOKRONOMETRI. Penentuan umur yellow cake secara radiokronometri telah dilakukan. Penelitian ini bertujuan mendapatkan data umur yellow cake pada penyusunan basis data perpustakaan forensik nuklir. Radiokronometer yang digunakan yaitu 228Th/232Th. 232Th merupakan thorium yang secara alami terdapat dalam yellow cake dan telah mencapai kesetimbangan peluruhan menjadi 228Th, namun pada proses produksi yellow cake kesetimbangannya terganggu sehingga waktu dinolkan kembali. Sampel uji yaitu yellow cake Cogema, hasil tambang PTBGN di Kalan dan hasil samping produk pabrik Petrokimia Gresik. Tahapan yang dilakukan yaitu pelarutan sampel, pemisahan thorium dari uranium dengan metode kromatografi pertukaran kation menggunakan resin dowex 50W-X8, elektrodeposisi thorium dan analisis isotop menggunakan spektrometer alfa. Penentuan umur dilakukan dengan perhitungan rasio aktivitas 228Th/232Th dan iterasi rumus peluruhan. Berdasarkan hasil analisis isotop 228Th dan 232Th menggunakan spektrometer alfa dan hasil perhitungan umur, yellow cake Cogema tidak dapat ditentukan umurnya karena tidak mengandung 232Th. Diperoleh nilai umur yellow cake Petrokimia Gresik yaitu 9,90 tahun dengan bias 20,35 tahun dan nilai umur yellow cake PTBGN yaitu 12,85 tahun dengan bias >20,15 tahun dibandingkan dengan perkiraan waktu produksi yang diketahui. Bias yang diperoleh lebih tinggi jika dibandingkan dengan hasil penentuan umur yellow cake menggunakan radiokronometer 228Th/232Th oleh peneliti sebelumnya yaitu dengan bias kurang dari 10 tahun.Kata kunci: Yellow Cake, Thorium, Radiokronometri.

show abstract

“…After this step, the protactinium was again dissolved in HF (Seastar Chemicals Inc., Vancouver, Canada) 2 and a subsample containing 2 mg protactinium was dried first in perchloric acid and then dried two times in concentrated HNO 3 (Seastar Chemicals Inc., Vancouver, Canada). An additional separation was then performed on this sample using a silica gel column chemistry technique described in Treinen et al [17]. A subsample of this purified material (approximately 125 μg of 231 Pa) was prepared as the M solution by diluting the 231 Pa in a mixed solution of 2 mol L −1 HNO 3 and 0.1 mol L −1 HF.…”

Section: Materials Preparationmentioning

confidence: 99%

“…A batch of 233 Pa IDMS spike was prepared by separation from a high-purity 237 Np solution (65 mg of 237 Np in HCl). This separation was performed using an AG MP-1 M anion exchange resin followed by a silica gel separation, as described in [17]. The purification procedure was completed at 22:50 UTC on 27 June 2017.…”

Section: Materials Preparationmentioning

confidence: 99%

Preparation and calibration of a 231Pa reference material

Essex

Williams

Treinen

et al. 2019

J Radioanal Nucl Chem

Self Cite

View full text Add to dashboard Cite

A 231 Pa reference material has been characterized for amount of protactinium. This reference material is primarily intended for calibration of 233 Pa tracers produced for 235 U-231 Pa model age measurements associated with nuclear forensics and nuclear safeguards. Primary measurements for characterization were made by isotope dilution mass spectrometry of a purified 231 Pa solution using a 233 Pa isotopic spike. The spike was calibrated by allowing multiple aliquots of the 233 Pa spike solution to decay to 233 U and then measuring the ingrown 233 U by isotope dilution mass spectrometry using a certified uranium assay and isotopic standard as a reverse-spike. The new 231 Pa reference material will simplify calibration of the 233 Pa isotope dilution spikes, provide metrological traceability, and potentially reduce the overall measurement uncertainty of model ages.

show abstract

Improved protactinium spike calibration method applied to 231Pa–235U age-dating of certified reference materials for nuclear forensics

Cited by 11 publications

References 14 publications

230Th-234U and 231Pa-235U radiochronometry of hydrolyzed uranium hexafluoride gas

230Th-234U and 231Pa-235U radiochronometry of hydrolyzed uranium hexafluoride gas

Penentuan Umur Yellow Cake Secara Radiokronometri

Preparation and calibration of a 231Pa reference material

Contact Info

Product

Resources

About