<p class="MsoBodyText"><span lang="EN-GB">This document specifies a screening test method to quantify rapidly the activity concentration of gamma-emitting radionuclides, such as <sup>131</sup>I, <sup>132</sup>Te, <sup>134</sup>Cs and <sup>137</sup>Cs, in solid or liquid test samples using gamma-ray spectrometry with lower resolution scintillation detectors as compared with the HPGe detectors (see IEC 61563</span><span lang="EN-GB">[</span><span lang="EN-GB">7</span><span lang="EN-GB">]</span><span lang="EN-GB">)<sup>.</sup></span></p>
<p class="MsoBodyText"><span lang="EN-GB">This test method can be used for the measurement of any potentially contaminated environmental matrices (including soil), food and feed samples as well as industrial materials or products that have been properly conditioned</span><span lang="EN-GB">[</span><span lang="EN-GB">8</span><span lang="EN-GB">]</span><span lang="EN-GB">. Sample preparation techniques used in the screening method are not specified in this document, since special sample preparation techniques other than simple machining (cutting, grinding, etc.) should not be required. Although the sampling procedure is of utmost importance in the case of the measurement of radioactivity in samples, it is out of scope of this document; other International Standards for sampling procedures that can be used in combination with this document are available (see References</span><span lang="EN-GB"> [</span><span lang="EN-GB"><!-- [if supportFields]><span
style='color:#0070C0'><span style='mso-element:field-begin'></span> REF
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style='mso-element:field-end'></span></span><![endif]--></span><span lang="EN-GB">] [</span><span lang="EN-GB">10</span><span lang="EN-GB">] [</span><span lang="EN-GB">11</span><span lang="EN-GB">] [</span><span lang="EN-GB">12</span><span lang="EN-GB">] [</span><span lang="EN-GB">13</span><span lang="EN-GB">] [</span><span lang="EN-GB">14</span><span lang="EN-GB">]</span><span lang="EN-GB">).</span></p>
<p class="MsoBodyText"><span lang="EN-GB">The test method applies to the measurement of gamma-emitting radionuclides such as <sup>131</sup>I, <sup>134</sup>Cs and <sup>137</sup>Cs. Using sample sizes of 0,5 l to 1,0 l in a Marinelli beaker and a counting time of 5 min to 20 min, decision threshold of 10 Bq·kg<sup>−1</sup> can be achievable using a commercially available scintillation spectrometer [e.g. thallium activated sodium iodide (NaI(Tl)) spectrometer 2” <em style="mso-bidi-font-style: normal;">ϕ</em> × 2” (50,8 mm Ø x 50,8 mm) detector size, 7 % resolution (FWHM) at 662 keV, 30 mm lead shield thickness].</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This test method also can be performed in a “makeshift” laboratory or even outside a testing laboratory on samples directly measured in the field where they were collected.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">During a nuclear or radiological emergency, this test method enables a rapid measurement of the activity concentration of potentially contaminated samples to check against operational intervention levels (OILs) set up by decision makers that would trigger a predetermined emergency response to reduce existing radiation risks</span><span lang="EN-GB">[</span><span lang="EN-GB">2].</span></p>
<p class="MsoBodyText"><span lang="EN-GB">Due to the uncertainty associated with the results obtained with this test method, test samples requiring more accurate test results can be measured using high purity germanium (HPGe) detectors gamma-ray spectrometry in a testing laboratory, following appropriate preparation of the test samples</span><span lang="EN-GB">[</span><span lang="EN-GB">15][16].</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This document does not contain criteria to establish the activity concentration of OILs.</span></p>
Registration number (WIID)
87739
Scope
<p class="MsoBodyText"><span lang="EN-GB">This document specifies a screening test method to quantify rapidly the activity concentration of gamma-emitting radionuclides, such as <sup>131</sup>I, <sup>132</sup>Te, <sup>134</sup>Cs and <sup>137</sup>Cs, in solid or liquid test samples using gamma-ray spectrometry with lower resolution scintillation detectors as compared with the HPGe detectors (see IEC 61563</span><span lang="EN-GB">[</span><span lang="EN-GB">7</span><span lang="EN-GB">]</span><span lang="EN-GB">)<sup>.</sup></span></p>
<p class="MsoBodyText"><span lang="EN-GB">This test method can be used for the measurement of any potentially contaminated environmental matrices (including soil), food and feed samples as well as industrial materials or products that have been properly conditioned</span><span lang="EN-GB">[</span><span lang="EN-GB">8</span><span lang="EN-GB">]</span><span lang="EN-GB">. Sample preparation techniques used in the screening method are not specified in this document, since special sample preparation techniques other than simple machining (cutting, grinding, etc.) should not be required. Although the sampling procedure is of utmost importance in the case of the measurement of radioactivity in samples, it is out of scope of this document; other International Standards for sampling procedures that can be used in combination with this document are available (see References</span><span lang="EN-GB"> [</span><span lang="EN-GB"><!-- [if supportFields]><span
style='color:#0070C0'><span style='mso-element:field-begin'></span> REF
Reference_ref_12 \r \h <span style='mso-element:field-separator'></span></span><![endif]-->9<!-- [if gte mso 9]><xml>
<w:data>08D0C9EA79F9BACE118C8200AA004BA90B0200000008000000110000005200650066006500720065006E00630065005F007200650066005F00310032000000</w:data>
</xml><![endif]--><!-- [if supportFields]><span style='color:#0070C0'><span
style='mso-element:field-end'></span></span><![endif]--></span><span lang="EN-GB">] [</span><span lang="EN-GB">10</span><span lang="EN-GB">] [</span><span lang="EN-GB">11</span><span lang="EN-GB">] [</span><span lang="EN-GB">12</span><span lang="EN-GB">] [</span><span lang="EN-GB">13</span><span lang="EN-GB">] [</span><span lang="EN-GB">14</span><span lang="EN-GB">]</span><span lang="EN-GB">).</span></p>
<p class="MsoBodyText"><span lang="EN-GB">The test method applies to the measurement of gamma-emitting radionuclides such as <sup>131</sup>I, <sup>134</sup>Cs and <sup>137</sup>Cs. Using sample sizes of 0,5 l to 1,0 l in a Marinelli beaker and a counting time of 5 min to 20 min, decision threshold of 10 Bq·kg<sup>−1</sup> can be achievable using a commercially available scintillation spectrometer [e.g. thallium activated sodium iodide (NaI(Tl)) spectrometer 2” <em style="mso-bidi-font-style: normal;">ϕ</em> × 2” (50,8 mm Ø x 50,8 mm) detector size, 7 % resolution (FWHM) at 662 keV, 30 mm lead shield thickness].</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This test method also can be performed in a “makeshift” laboratory or even outside a testing laboratory on samples directly measured in the field where they were collected.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">During a nuclear or radiological emergency, this test method enables a rapid measurement of the activity concentration of potentially contaminated samples to check against operational intervention levels (OILs) set up by decision makers that would trigger a predetermined emergency response to reduce existing radiation risks</span><span lang="EN-GB">[</span><span lang="EN-GB">2].</span></p>
<p class="MsoBodyText"><span lang="EN-GB">Due to the uncertainty associated with the results obtained with this test method, test samples requiring more accurate test results can be measured using high purity germanium (HPGe) detectors gamma-ray spectrometry in a testing laboratory, following appropriate preparation of the test samples</span><span lang="EN-GB">[</span><span lang="EN-GB">15][16].</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This document does not contain criteria to establish the activity concentration of OILs.</span></p>
