ASTM-C1268 › Standard Test Method for Quantitative Determination of 241Am in Plutonium by Gamma-Ray Spectrometry
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1.1 This test method covers the quantitative determination of 241Am by gamma-ray spectrometry in plutonium nitrate solution samples that do not contain significant amounts of radioactive fission products or other high specific activity gamma-ray emitters.
1.2 This test method can be used to determine the 241Am in samples of plutonium metal, oxide and other solid forms, when the solid is appropriately sampled and dissolved.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Significance and Use
5.1 This test method allows the determination of 241Am in a plutonium solution without separation of the americium from the plutonium. It is generally applicable to any solution containing 241Am.
5.2 The 241Am in solid plutonium materials may be determined when these materials are dissolved (see Practice ).
5.3 When the plutonium solution contains unacceptable levels of fission products or other materials, this method may be used following a tri-n-octylphosphine oxide (TOPO) extraction, ion exchange or other similar separation techniques (see Test Methods and ).
5.4 This test method is less subject to interferences from plutonium than alpha counting since the energy of the gamma ray used for the analysis is better resolved from other gamma rays than the alpha particle energies used for alpha counting.
5.5 The minimal sample preparation reduces the amount of sample handling and exposure to the analyst.
5.6 This test method is applicable only to homogeneous solutions. This test method is not suitable for solutions containing solids.
5.7 Solutions containing as little as 1 × 10 −5 g/L 241Am may be analyzed using this method. The lower limit depends on the detector used and the counting geometry. Solutions containing high concentrations may be analyzed following an appropriate dilution.
americium-241; gamma-ray spectrometry; nondestructive analysis; plutonium solutions ;; ICS Number Code 27.120.30 (Fissile materials and nuclear fuel technology)
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Revision with Title Change
July 15, 2015