<?xml version="1.0" encoding="UTF-8"?><toc><section id="sec_foreword"><title>Foreword</title></section><section id="sec_intro"><title>Introduction</title></section><section id="body"><title>Hauptteil</title><section id="sec_1"><label>1</label><title>Scope</title></section><section id="sec_2"><label>2</label><title>Normative references</title></section><section id="sec_3"><label>3</label><title>Terms, definitions, symbols and abbreviated terms</title><section id="sec_3.1"><label>3.1</label><title>Terms and definitions</title></section><section id="sec_3.2"><label>3.2</label><title>Symbols and abbreviated terms</title></section></section><section id="sec_4"><label>4</label><title>Principle</title></section><section id="sec_5"><label>5</label><title>Reagents and equipment</title></section><section id="sec_6"><label>6</label><title>Sampling</title></section><section id="sec_7"><label>7</label><title>Procedure</title><section id="sec_7.1"><label>7.1</label><title>Direct counting</title></section><section id="sec_7.2"><label>7.2</label><title>Thermal preconcentration</title></section><section id="sec_7.3"><label>7.3</label><title>Sample preparation</title></section><section id="sec_7.4"><label>7.4</label><title>Liquid scintillation measurement</title><section id="sec_7.4.1"><label>7.4.1</label><title>Preparation of alpha and beta calibration sources</title></section><section id="sec_7.4.2"><label>7.4.2</label><title>Optimization of counting conditions</title></section><section id="sec_7.4.3"><label>7.4.3</label><title>Blank sample preparation and measurement</title></section><section id="sec_7.4.4"><label>7.4.4</label><title>Alpha and beta efficiencies</title></section><section id="sec_7.4.5"><label>7.4.5</label><title>Sample measurement</title></section></section></section><section id="sec_8"><label>8</label><title>Expression of results</title><section id="sec_8.1"><label>8.1</label><title>Calculation of activity per mass</title></section><section id="sec_8.2"><label>8.2</label><title>Standard uncertainty</title></section><section id="sec_8.3"><label>8.3</label><title>Decision threshold</title></section><section id="sec_8.4"><label>8.4</label><title>Detection limit</title></section><section id="sec_8.5"><label>8.5</label><title>Confidence limits</title></section><section id="sec_8.6"><label>8.6</label><title>Quality control</title></section></section><section id="sec_9"><label>9</label><title>Interference control</title><section id="sec_9.1"><label>9.1</label><title>Contamination</title></section><section id="sec_9.2"><label>9.2</label><title>Ingrowth of radon</title></section><section id="sec_9.3"><label>9.3</label><title>Loss of polonium</title></section></section><section id="sec_10"><label>10</label><title>Test report</title></section></section><section id="sec_A"><label>Annex A</label><title>Set-up parameters and validation data (informative)</title><section id="sec_A.1"><label>A.1</label><title>General</title></section><section id="sec_A.2"><label>A.2</label><title>Instrument set up and calibration</title></section><section id="sec_A.3"><label>A.3</label><title>Expression of results</title></section><section id="sec_A.4"><label>A.4</label><title>Validation data</title><section id="sec_A.4.1"><label>A.4.1</label><title>Linearity</title></section><section id="sec_A.4.2"><label>A.4.2</label><title>Precision under intermediate repeatability conditions</title></section><section id="sec_A.4.3"><label>A.4.3</label><title>Accuracy</title></section></section></section><section id="sec_B"><label>Annex B</label><title>Method performances under different conditions (informative)</title></section><section id="sec_bibl"><title>Bibliography</title></section></toc>