{"id":119,"date":"2021-08-19T11:38:14","date_gmt":"2021-08-19T11:38:14","guid":{"rendered":"https:\/\/irasactiveanalytics.co.uk\/?page_id=119"},"modified":"2025-07-22T15:10:40","modified_gmt":"2025-07-22T15:10:40","slug":"activity-depth-profiling","status":"publish","type":"page","link":"https:\/\/irasactiveanalytics.co.uk\/?page_id=119","title":{"rendered":"Activity Depth Profiling"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>The importance of depth profile data&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#004d96\">Data on the depth profile of contamination within any structure is fundamental to evaluating decontamination options and deciding upon decommissioning strategy.&nbsp; Decisions on the depth of removal not only affect the selection of the techniques to be&nbsp;used, but&nbsp;are critical to the waste categorisation of both removed and remaining materials, and often has a bearing on the radiation dose to which those decommissioning the structure will receive. Such segregation is not optional, as in most cases it will be a condition of the waste producers EPR Permit or RSA Authorisation. Although individual Permits differ, there will generally be a requirement to use BAT to a) minimise the volume of radioactive waste disposed of, and b) to characterise, sort and segregate solid radioactive waste to facilitate their disposal by optimised disposal routes.&nbsp; ALARP&nbsp;will&nbsp;also be a consideration for material removal, in terms of optimising dose to decommissioning workers.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-group alignwide\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-media-text is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"967\" src=\"https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/Depth-profile-graph-1-1024x967.png\" alt=\"Depth Profiling at IRAS Active Analytics.\" class=\"wp-image-292 size-full\" srcset=\"https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/Depth-profile-graph-1-1024x967.png 1024w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/Depth-profile-graph-1-300x283.png 300w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/Depth-profile-graph-1-768x725.png 768w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/Depth-profile-graph-1-1536x1451.png 1536w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/Depth-profile-graph-1-2048x1934.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"has-text-align-left wp-block-paragraph\" style=\"font-size:38px\"><meta charset=\"utf-8\"><meta charset=\"utf-8\"><strong>Depth Profiling at IRAS Active Analytics<\/strong><\/p>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">IRAS Active Analytics offer both non-destructive and destructive facilities for determining the depth profile of radionuclides in concrete cores and other substrates.&nbsp;<\/p>\n\n\n\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#004d96\">For&nbsp;non-destructive&nbsp;testing, the IRAS&nbsp;RadProfiler\u2122 series of instruments&nbsp;provide accurate and high precision data on the depth distribution of gamma emitting radionuclides.&nbsp;Depending on&nbsp;selected options,&nbsp;the&nbsp;IRAS&nbsp;RadProfiler\u2122&nbsp;is used with&nbsp;either&nbsp;one or four gamma spectrometry detectors,&nbsp;of&nbsp;low resolution&nbsp;NaI(Tl) or high resolution&nbsp;HPGe&nbsp;types.&nbsp; Both the low resolution and&nbsp;high resolution&nbsp;detector options provide an industry standard digital detector interface, and link to standard computer controlled Multi-Channel Analyser functions.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#004d96\">The system allows the depth profile of gamma emitting radionuclides to be determined, either in absolute terms (Bq\/g) or where more appropriate, by making relative photopeak count rate measurements to determine the exponential decay factor (mm<sup>-1<\/sup>) which describes the shape of the exponential decrease in activity concentration from a contaminated core face.&nbsp; The system does so with standard operating depth resolutions of 1, 2, 5 and 10 mm, although other collimator slit sizes can be accommodated.&nbsp;<\/p>\n\n\n\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#004d96\">The system provides for totally non-destructive testing of cores, providing highly reliable and reproducible data, with an impressive depth resolution.&nbsp; Long term measurement reproducibility tests have shown that the residual standard deviations of repeated measurements to be approximately 2%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IRAS Active Analytics operate&nbsp;two IRAS&nbsp;RadProfiler&nbsp;\u2122&nbsp;MkII&nbsp;collimated gamma spectrometer systems.&nbsp;&nbsp;Recently re-designed, the&nbsp;MkII&nbsp;retains the same performance characteristics but with improvements in operability and portability, of particular importance for deployment at site.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-gallery alignwide has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"743\" data-id=\"402\" src=\"https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/IRAS-RadProfilerTM-1-1-1024x743.jpg\" alt=\"Depth Profiling at IRAS Active Analytics.\" class=\"wp-image-402\" srcset=\"https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/IRAS-RadProfilerTM-1-1-1024x743.jpg 1024w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/IRAS-RadProfilerTM-1-1-300x218.jpg 300w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/IRAS-RadProfilerTM-1-1-768x557.jpg 768w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/IRAS-RadProfilerTM-1-1-1536x1114.jpg 1536w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/IRAS-RadProfilerTM-1-1.jpg 1978w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"773\" data-id=\"403\" src=\"https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/DSC00137-1-1024x773.jpg\" alt=\"Depth Profiling at IRAS Active Analytics.\" class=\"wp-image-403\" srcset=\"https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/DSC00137-1-1024x773.jpg 1024w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/DSC00137-1-300x226.jpg 300w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/DSC00137-1-768x580.jpg 768w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/DSC00137-1-1536x1160.jpg 1536w, https:\/\/irasactiveanalytics.co.uk\/wp-content\/uploads\/2021\/10\/DSC00137-1.jpg 1963w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The importance of depth profile data&nbsp; Data on the depth profile of contamination within any structure is fundamental to evaluating decontamination options and deciding upon decommissioning strategy.&nbsp; Decisions on the depth of removal not only affect the selection of the techniques to be&nbsp;used, but&nbsp;are critical to the waste categorisation of both removed and remaining materials, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-119","page","type-page","status-publish","hentry","post"],"yoast_head":"<!-- This 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