ISO 11483:2005描述了制备钚源的三种简单快速的程序和一种通过α光谱法测量238Pu与（239Pu+240Pu）活度比的程序。将α谱法与质谱联用用于238Pu同位素丰度的测定，消除了后一种方法中238U可能存在的干扰。它适用于分析每毫升含有50微克至200微克钚的2摩尔/升至4摩尔/升硝酸中的钚纯化溶液，这可能是通过质谱法进行钚同位素分析之前的化学处理和纯化产生的。

ISO 11483: 2005 describes three simple and fast procedures to prepare plutonium sources and a procedure to measure the activity ratio of ²³⁸Pu to (²³⁹Pu + ²⁴⁰Pu) by alpha spectrometry. The alpha spectrometry method is used for the determination of isotopic abundance of ²³⁸Pu in combination with mass spectrometry and eliminates the possible interferences of ²³⁸U in the latter method. It applies to the analysis of purified solutions of plutonium in 2 mol/l to 4 mol/l nitric acid containing 50 micrograms to 200 micrograms of plutonium per millilitre, as may result from the chemical treatment and purification preceding plutonium isotopic analysis by mass spectrometry.