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<p class="MsoBodyText"><span lang="EN-GB">This document applies to the determination of beta emitters activity concentration using liquid scintillation counting. The method requires the preparation of a scintillation source, which is obtained by mixing the test sample and a scintillation cocktail. The test sample can be liquid (aqueous or organic), or solid (particles or filter or planchet).</span></p>
<p class="Note"><span lang="EN-GB">NOTE<span style="mso-tab-count: 1;"> </span>Planchet are samples, described in</span> <span lang="EN-GB"><!-- [if supportFields]><span
style='color:#0070C0'><span style='mso-element:field-begin'></span><span
style='mso-spacerun:yes'> </span>REF Section_sec_8.5 \r \h <span
style='mso-element:field-separator'></span></span><![endif]--></span><span lang="EN-GB">8.5</span><span lang="EN-GB">,</span><span lang="EN-GB"> out of solid material e.g. small metal, plastic or glass pans or support material made of these materials</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This document describes the conditions for measuring the activity concentration of beta emitter radionuclides by liquid scintillation counting</span><span lang="EN-GB">[</span><span lang="EN-GB"><!-- [if supportFields]><sup><span
style='color:#0070C0'><span style='mso-element:field-begin'></span></span></sup><span
style='color:#0070C0'> REF Reference_ref_8 \r \h <sup><span style='mso-element:
field-separator'></span></sup></span><![endif]-->2<!-- [if gte mso 9]><xml>
<w:data>08D0C9EA79F9BACE118C8200AA004BA90B0200000008000000100000005200650066006500720065006E00630065005F007200650066005F0038000000</w:data>
</xml><![endif]--><!-- [if supportFields]><sup><span
style='color:#0070C0'><span style='mso-element:field-end'></span></span></sup><![endif]--></span><span lang="EN-GB">]</span><span lang="EN-GB">.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">The choice of the test method using liquid scintillation counting involves the consideration of the potential presence of other beta-, alpha- and gamma emitter radionuclides in the test sample. In this case, a specific sample treatment by separation or extraction is implemented to isolate the radionuclide of interest in order to avoid any interference with other beta-, alpha- and gamma-emitting radionuclides during the counting phase.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This document is applicable to all types of liquid samples having an activity concentration ranging from about 1 Bq·l<sup>−1</sup> to 10<sup>6</sup> Bq·l<sup>−1</sup>. For a liquid test sample, it is possible to dilute liquid test samples in order to obtain a solution having an activity compatible with the measuring instrument. For solid samples, the activity of the prepared scintillation source shall be compatible with the measuring instrument.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">The measurement range is related to the test method used: nature of test portion, preparation of the scintillator - test portion mixture, measuring assembly as well as to the presence of the co-existing activities due to interfering radionuclides.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">Test portion preparations (such as distillation for <sup>3</sup>H measurement, or benzene synthesis for <sup>14</sup>C measurement, etc.) are outside the scope of this document and are described in specific test methods using liquid scintillation</span><span lang="EN-GB">[</span><span lang="EN-GB">3][[4][5][6][7][8][9][10].</span></p>
Reģistrācijas numurs (WIID)
87740
Darbības sfēra
<p class="MsoBodyText"><span lang="EN-GB">This document applies to the determination of beta emitters activity concentration using liquid scintillation counting. The method requires the preparation of a scintillation source, which is obtained by mixing the test sample and a scintillation cocktail. The test sample can be liquid (aqueous or organic), or solid (particles or filter or planchet).</span></p>
<p class="Note"><span lang="EN-GB">NOTE<span style="mso-tab-count: 1;"> </span>Planchet are samples, described in</span> <span lang="EN-GB"><!-- [if supportFields]><span
style='color:#0070C0'><span style='mso-element:field-begin'></span><span
style='mso-spacerun:yes'> </span>REF Section_sec_8.5 \r \h <span
style='mso-element:field-separator'></span></span><![endif]--></span><span lang="EN-GB">8.5</span><span lang="EN-GB">,</span><span lang="EN-GB"> out of solid material e.g. small metal, plastic or glass pans or support material made of these materials</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This document describes the conditions for measuring the activity concentration of beta emitter radionuclides by liquid scintillation counting</span><span lang="EN-GB">[</span><span lang="EN-GB"><!-- [if supportFields]><sup><span
style='color:#0070C0'><span style='mso-element:field-begin'></span></span></sup><span
style='color:#0070C0'> REF Reference_ref_8 \r \h <sup><span style='mso-element:
field-separator'></span></sup></span><![endif]-->2<!-- [if gte mso 9]><xml>
<w:data>08D0C9EA79F9BACE118C8200AA004BA90B0200000008000000100000005200650066006500720065006E00630065005F007200650066005F0038000000</w:data>
</xml><![endif]--><!-- [if supportFields]><sup><span
style='color:#0070C0'><span style='mso-element:field-end'></span></span></sup><![endif]--></span><span lang="EN-GB">]</span><span lang="EN-GB">.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">The choice of the test method using liquid scintillation counting involves the consideration of the potential presence of other beta-, alpha- and gamma emitter radionuclides in the test sample. In this case, a specific sample treatment by separation or extraction is implemented to isolate the radionuclide of interest in order to avoid any interference with other beta-, alpha- and gamma-emitting radionuclides during the counting phase.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">This document is applicable to all types of liquid samples having an activity concentration ranging from about 1 Bq·l<sup>−1</sup> to 10<sup>6</sup> Bq·l<sup>−1</sup>. For a liquid test sample, it is possible to dilute liquid test samples in order to obtain a solution having an activity compatible with the measuring instrument. For solid samples, the activity of the prepared scintillation source shall be compatible with the measuring instrument.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">The measurement range is related to the test method used: nature of test portion, preparation of the scintillator - test portion mixture, measuring assembly as well as to the presence of the co-existing activities due to interfering radionuclides.</span></p>
<p class="MsoBodyText"><span lang="EN-GB">Test portion preparations (such as distillation for <sup>3</sup>H measurement, or benzene synthesis for <sup>14</sup>C measurement, etc.) are outside the scope of this document and are described in specific test methods using liquid scintillation</span><span lang="EN-GB">[</span><span lang="EN-GB">3][[4][5][6][7][8][9][10].</span></p>
