Method of measuring gadolinia content using inductively coupled plasma-atomic emission spectrometry

A method of measuring a gadolinia content using inductively coupled plasma-atomic emission spectrometry, the method comprising:

• grinding sintered gadolinium using a percussion mortar to obtain a ground sample;
• warming the ground sample and then dissolving it with an acid solution to obtain dissolved gadolinia;
• diluting the dissolved gadolinia with distilled water to obtain a diluted gadolinia solution;
• measuring mass of each of a uranium element and a gadolinium element in the diluted gadolinia solution by a unit of ppm using the inductively coupled plasma-atomic emission spectrometry;
• calculating a molar fraction of gadolinium from the diluted gadolinia solution and then calculating the gadolinia content using the molar fraction of gadolinium;
• correcting a uranium component by a 100 ppm uranium standard solution, after diluting the dissolved gadolinia;
• and
• correcting a gadolinium component by a 10 ppm gadolinium standard solution, after diluting the dissolved gadolinia, wherein the dissolving is performed by dissolving the ground sample with a nitric acid solution at a 1:1 ratio.