{"id":706,"date":"2014-02-27T15:39:21","date_gmt":"2014-02-27T23:39:21","guid":{"rendered":"http:\/\/radwatch.berkeley.edu\/?p=706"},"modified":"2022-12-21T11:29:17","modified_gmt":"2022-12-21T19:29:17","slug":"seaweed2013","status":"publish","type":"post","link":"https:\/\/radwatch.berkeley.edu\/es\/2014\/02\/seaweed2013\/","title":{"rendered":"Seaweed Measurements (2013)"},"content":{"rendered":"<style>\n#isotopes td {\nborderstyle:none;\nborder:0;\nmargin:20;\npadding:2px 5px 5px 5px;\ntext-align:left;\nvertical-align:top;\n}\n#isotopes td.isot {\nwidth:9%;\ntext-align:right;\nfont-weight:bold;\n}\n#samples {\nfont-family:Arial, Helvetica, sans-serif;\nwidth:100%;\nborder-collapse:collapse;\n}\n#samples td, #samples th {\nfont-size:1em;\nborder:1px solid #13436D;\npadding:3px 7px 2px 7px;\ntext-align:center;\n}\n#samples th {\nfont-size:1.1em;\ntext-transform:none;\npadding-top:5px;\npadding-bottom:4px;\nbackground-color:#13436D;\ncolor:#ffffff;\n}\n#samples tr td {\ncolor:#000000;\nbackground-color:#F0F8FF;\n}\n#samples tr.alt td {\ncolor:#000000;\nbackground-color:#D1DEFF;\n}\n<\/style>\n<p>These seaweed samples were provided to our group by a seaweed harvesting company located in Northern California as a continuation of a study beginning in spring 2011. As in previous years, we tested the samples using a high purity germanium (HPGe) detector in Etcheverry Hall, UC Berkeley. HPGe detectors have very high spectral resolution, meaning they are able to distinguish the gamma-ray lines coming from different radioactive isotopes. For seaweed this is especially important because there is typically a large amount of the naturally occurring isotope <a href=\"http:\/\/en.wikipedia.org\/wiki\/Potassium-40\">potassium-40 (K-40)<\/a>.<\/p>\n<p><p>The samples were counted for between 24-36 hours each in order to measure enough gamma rays to get good statistics. The results are displayed in the table below, expressed in units of <a href=\"http:\/\/en.wikipedia.org\/wiki\/Becquerel\">Becquerels<\/a> per kilogram, where one Becquerel is one nuclear decay per second. The weights used in the analysis are the &#8220;dry&#8221; weights of the seaweed.<\/p>\n<p>No isotopes due to Fukushima have been found in these or any previous samples we have tested.<\/p>\n<p>A table of these results is shown below.<\/p>\n<h2>Table of Results:<\/h2>\n<table id=\"samples\">\n<tr>\n<th>Species<\/th>\n<th>Location<\/th>\n<th>Date Harvested<\/th>\n<th>K-40 [Bq\/kg]<\/th>\n<th>Cs-134 [Bq\/kg]<\/th>\n<th>Cs-137 [Bq\/kg]<\/th>\n<\/tr>\n<tr>\n<td> Alaria Marginata <\/td>\n<td>Greenwood Cove<\/td>\n<td>04\/28\/2013<\/td>\n<td>1050 &plusmn; 100<\/td>\n<td><font color=\"gray\">N.D. (&lt;0.20)<\/font><\/td>\n<td><font color=\"gray\">N.D. (&lt;0.20)<\/font><\/td>\n<\/tr>\n<tr class=\"alt\">\n<td>Porphyra Lanceolata<\/td>\n<td>McKerricken<\/td>\n<td>06\/11\/2013<\/td>\n<td>360 &plusmn; 36<\/td>\n<td><font color=\"gray\">N.D. (&lt;0.085)<\/td>\n<p><\/font><\/p>\n<td><font color=\"gray\">N.D. (&lt;0.14)<\/td>\n<p><\/font><br \/>\n<\/tr>\n<tr>\n<td>Postelsia Palmaeformis<\/td>\n<td>Medocino Coast <\/td>\n<td>07\/10\/2013<\/td>\n<td>870 &plusmn; 90<\/td>\n<td><font color=\"gray\">N.D. (&lt;0.068)<\/td>\n<p><\/font><\/p>\n<td><font color=\"gray\">N.D. (&lt;0.11)<\/td>\n<p><\/font><br \/>\n<\/tr>\n<tr class=\"alt\">\n<td>Laminaria Setchellii<\/td>\n<td>McKerricken<\/td>\n<td>07\/22\/2013<\/td>\n<td>810 &plusmn; 80<\/td>\n<td><font color=\"gray\">N.D. (&lt;0.12)<\/td>\n<p><\/font><\/p>\n<td><font color=\"gray\">N.D. (&lt;0.13)<\/td>\n<p><\/font><br \/>\n<\/tr>\n<\/table>\n<p><\/br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>RadWatch and DoseNet again had the opportunity to participate in the Exploratorium After Dark focusing on radiation, through our ongoing collaboration with the Exploratorium &#8211; you can check out our ongoing data collection from the Exploratorium roof on our DoseNet map. We had a great group of volunteers and had a few hundred visitors come by our table. Thanks to our friends at the Exploratorium for hosting, and all of the interest from participants!<\/p>","protected":false},"author":10,"featured_media":707,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[47,45,50],"class_list":["post-706","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sampling","tag-environmental-radiation","tag-fukushima","tag-kelpwatch","post-with-thumbnail","post-with-thumbnail-large"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Seaweed Measurements (2013) - Berkeley RadWatch<\/title>\n<meta name=\"description\" content=\"DoseNet table at Exploratorium After Dark Radiation night\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/radwatch.berkeley.edu\/es\/2014\/02\/seaweed2013\/\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Seaweed Measurements (2013) - 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