ASTM C761-24
六氟化鈾的化學(xué) 質(zhì)譜光譜核和放射化學(xué)分析的標(biāo)準(zhǔn)測(cè)試方法

Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Uranium Hexafluoride

適用范圍: The TTA test method covers the determination of 237 Np mass fraction in UF6. Np can be selectively extracted from an aqueous solution into a TTA-xylene solution, and a 239 Np tracer technique can be used to measure extraction losses; thereby, eliminating the need for a more laborious quantitative extraction. Neptunium can also be determined using Guide C1561. Determination of soluble chromium mass fraction in UF6 The test method is based on the elemental mass of uranium in the range from 0.2 μg/g to 100 μg/g. The UF6 is filtered through a porous filter, and the filtered sample is hydrolyzed in deionized water. Chromium is separated from uranium using an n-tributyl phosphate (TBP)-xylene mixture, leaving chromium in the aqueous phase. Chromium is determined by atomic absorption spectroscopy after dilution to a standard volume.

術(shù)語(yǔ)	描述
Alpha Counter Alpha Counter	An instrument used to measure alpha particle emissions.
Gamma Scintillation Spectrometer Gamma Scintillation Spectrometer	A device used to detect and analyze gamma radiation emissions.

Alpha Counter 背景計(jì)數(shù)率小于5 cpm	用于測(cè)量樣品中的 alpha 活性
Gamma Scintillation Spectrometer 單道分析儀或多元道儀器	用于檢測(cè)和分析 239 Np 的 gamma 輻射