{"id":711,"date":"2014-03-12T12:15:51","date_gmt":"2014-03-12T19:15:51","guid":{"rendered":"http:\/\/radwatch.berkeley.edu\/?p=711"},"modified":"2026-04-29T06:11:33","modified_gmt":"2026-04-29T13:11:33","slug":"hmb-sand","status":"publish","type":"post","link":"https:\/\/radwatch.berkeley.edu\/es\/2014\/03\/hmb-sand\/","title":{"rendered":"Half Moon Bay Measurements: Quantitative Sand Analysis (Follow Up)"},"content":{"rendered":"<style>\nsup {\n  vertical-align: super;\n  font-size: 0.8em;\n  line-height: 0;\n}\n.isotopes td {\n  borderstyle:none;\n  border:0;\n  margin:20;\n  padding:2px 5px 5px 5px;\n  text-align:left;\n  vertical-align:top;\n}\n.isotopes td.isot {\n  width:9%;\n  text-align:right;\n  font-weight:bold;\n}\n.samples {\n  font-family:Arial, Helvetica, sans-serif;\n  width:100%;\n  border-collapse:collapse;\n}\n.samples td, .samples th {\n  font-size:1em;\n  border:1px solid #13436D;\n  padding:3px 7px 2px 7px;\n  text-align:center;\n}\n.samples th {\n  font-size:1.1em;\n  text-transform:none;\n  padding-top:5px;\n  padding-bottom:4px;\n  background-color:#13436D;\n  color:#ffffff;\n}\n.samples tr td {\n  color:#000000;\n  background-color:#F0F8FF;\n}\n.samples tr.alt td {\n  color:#000000;\n  background-color:#D1DEFF;\n}\n.samples tr td.nd, .samples tr.alt td.nd {\n  color: gray;\n}\n<\/style>\n<p><script type=\"text\/javascript\" src=\"http:\/\/code.jquery.com\/jquery-1.4.4.min.js\"><\/script><br \/>\n<script type=\"text\/javascript\" src=\"https:\/\/raw.github.com\/bramstein\/column-selector\/master\/lib\/jquery.column.js\"><\/script><br \/>\n<script type=\"text\/javascript\" src=\"https:\/\/raw.github.com\/bramstein\/text-align\/master\/lib\/jquery.text-align.js\"><\/script><br \/>\n<script type=\"text\/javascript\">\n  $(function() {\n    var myCells = $('table.samples td');\n    myCells.nthCol(2).textAlign('.');\n    myCells.nthCol(3).textAlign('.');\n    myCells.nthCol(4).textAlign('.');\n    myCells.nthCol(5).textAlign('.');\n    myCells.nthCol(6).textAlign('.');\n  });\n<\/script><\/p>\n<h3> This is follow-up, <b>technical analysis<\/b> of beach sands found at <a href=\"\/hmb\">Half Moon Bay<\/a>. <\/h3>\n<p>While we were out at <a href=\"\/hmb\">Half Moon Bay<\/a> we wanted to collect samples that we could take back to the lab for more careful analysis. Here we present the results of this sampling and quantitatively present our results. Previously, we found that mostly Uranium and Thorium isotopes were contributing to the increased count rate along the beach, and we wanted to measure the concentrations of these isotopes present in the sand. The locations we sampled can be seen on the map below (Fig.1). These samples were then measured in a sensitive, low background High Purity Germanium Detector (HPGe) to identify the naturally occurring sources of radiation. <\/p>\n<p><\/p>\n<p>The naturally occurring radionuclides, Uranium-238, Thorium-232 and Potassium-40 were specifically assayed for concentration. The sand measurements show that the concentration on the beach is higher than the concentration on the approach to the beach and the variation in the count rates is quite large. <\/p>\n<p><\/p>\n<p>Trace amounts of Cs-137 were also identified, although the majority of this is residuals from atmospheric testing of nuclear weapons. The isotope Cesium-134 is not detected; its presence would have been a definitive indicator of material from Fukushima. The variations that we see in the measurements are a result of varying U,Th concentrations in the soil. These isotopes are found in different concentrations depending on the site&#8217;s geology. <\/p>\n<p><\/p>\n<h2>Sample Locations<\/h2>\n<p>The locations in the tables correspond to the map shown below from the <a href=\"https:\/\/radwatch.berkeley.edu\/2014\/01\/hmb\/\">Surfer&#8217;s Beach report<\/a>:<\/p>\n<p><center><a name=\"fig3\" id=\"fig3\"><\/a><img decoding=\"async\" src=\"https:\/\/radwatch.berkeley.edu\/wp-content\/uploads\/2022\/12\/HMB-output-5_1.png\" alt=\"Bar chart of identified isotope count rates at each measurement location\" width=\"450\/\" \/><\/p>\n<p style=\"width:80%;text-align:center;\">Samples were taken from locations 1-5 on the beach at Half Moon Bay. The red bars indicate readings taken by a Geiger counter.<\/p>\n<p><\/center><br \/>\n<\/p>\n<h2>Table of Results:<\/h2>\n<table class=\"samples\">\n<tr>\n<th>Location<\/th>\n<th> Depth below surface <\/th>\n<th width=\"18%\">K-40 (natural) [Bq\/kg]<\/th>\n<th width=\"18%\">U-238 (natural) [Bq\/kg]<\/th>\n<th width=\"18%\">Th-232 (natural) [Bq\/kg]<\/th>\n<th width=\"18%\">Cs-137 [Bq\/kg]<\/th>\n<th width=\"18%\">Cs-134 [Bq\/kg]<\/th>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td> 0&#8243; <\/td>\n<td>72.5<\/td>\n<td>714<\/td>\n<td>562<\/td>\n<td class=\"nd\">ND (&lt;0.52)<\/td>\n<td class=\"nd\">ND (&lt;0.49)<\/td>\n<\/tr>\n<tr class=\"alt\">\n<td>2<\/td>\n<td> 1&#8243; <\/td>\n<td>272<\/td>\n<td>301<\/td>\n<td>239<\/td>\n<td>0.19(7)<\/td>\n<td class=\"nd\"><font color=\"gray\">ND (&lt;0.11)<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td> 0&#8243; <\/td>\n<td>67.9<\/td>\n<td>714<\/td>\n<td>507<\/td>\n<td class=\"nd\">ND (&lt;0.48)<\/td>\n<td class=\"nd\">ND (&lt;0.45)<\/td>\n<\/tr>\n<tr class=\"alt\">\n<td>3<\/td>\n<td> 1&#8243; <\/td>\n<td>59.3<\/td>\n<td>688<\/td>\n<td>553<\/td>\n<td class=\"nd\">ND (&lt;0.52)<\/td>\n<td class=\"nd\">ND (&lt;0.46)<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td> 1&#8243; <\/td>\n<td>217<\/td>\n<td>367<\/td>\n<td>312<\/td>\n<td class=\"nd\">ND (&lt;0.15)<\/td>\n<td class=\"nd\">ND (&lt;0.14)<\/td>\n<\/tr>\n<tr class=\"alt\">\n<td>5<\/td>\n<td> 0&#8243;<\/td>\n<td>403<\/td>\n<td>25.3<\/td>\n<td>24.6<\/td>\n<td class=\"nd\">ND (&lt;0.06)<\/td>\n<td class=\"nd\">ND (&lt;0.05)<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td> 2&#8243;  <\/td>\n<td>366<\/td>\n<td>33.9<\/td>\n<td>40.9<\/td>\n<td class=\"nd\">ND (&lt;0.07)<\/td>\n<td class=\"nd\">ND (&lt;0.06)<\/td>\n<\/tr>\n<tr class=\"alt\">\n<td>6<\/td>\n<td> 0&#8243; <\/td>\n<td>413<\/td>\n<td>33.0<\/td>\n<td>24.9<\/td>\n<td>0.37(5)<\/td>\n<td class=\"nd\">ND (&lt;0.05)<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td> 1&#8243; <\/td>\n<td>218<\/td>\n<td>395<\/td>\n<td>322<\/td>\n<td class=\"nd\">ND (&lt;0.41)<\/td>\n<td class=\"nd\">ND (&lt;0.37)<\/td>\n<\/tr>\n<\/table>\n<p>There is a 1% uncertainty in the K-40, U-238, and Th-232 values stated above.<\/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":712,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[47,45,43,52],"class_list":{"0":"post-711","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-sampling","8":"tag-environmental-radiation","9":"tag-fukushima","10":"tag-half-moon-bay","11":"tag-surfers-beach","13":"post-with-thumbnail","14":"post-with-thumbnail-large"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Half Moon Bay Measurements: Quantitative Sand Analysis (Follow Up) - 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\/03\/hmb-sand\/\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Half Moon Bay Measurements: Quantitative Sand Analysis (Follow Up) - 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