{"id":3757,"date":"2015-06-16T14:02:52","date_gmt":"2015-06-16T14:02:52","guid":{"rendered":"http:\/\/www.swatlibraries.org\/projects\/speed\/anna\/2015\/06\/16\/coud-chamber\/"},"modified":"2024-01-19T19:10:46","modified_gmt":"2024-01-19T19:10:46","slug":"coud-chamber","status":"publish","type":"post","link":"https:\/\/demos.swarthmore.edu\/physics\/2015\/06\/coud-chamber\/","title":{"rendered":"Cloud Chamber"},"content":{"rendered":"<h3 style=\"text-align: center;\"><strong>Diffusion Cloud Chamber<\/strong><\/h3>\n<p style=\"text-align: center;\"><a href=\"http:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr1.jpg\" rel=\"attachment wp-att-6005\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6005\" src=\"http:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr1-300x169.jpg\" alt=\"cloud chbr1\" width=\"610\" height=\"344\" srcset=\"https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr1-300x169.jpg 300w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr1-768x432.jpg 768w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr1-1024x576.jpg 1024w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr1-772x434.jpg 772w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr1-624x351.jpg 624w\" sizes=\"(max-width: 610px) 100vw, 610px\" \/><\/a><\/p>\n<ul>\n<li>The Pasco Diffusion Cloud Chamber is very easy to set up and operate- does not require use of dry ice or liquid nitrogen.<\/li>\n<li>Use pump to circulate ice water through base. Peltier device cools chamber base down to -35 C.<\/li>\n<li>Soak paper liner with isopropyl alcohol (93% or higher), and pour alcohol into bottom of chamber 1 mm deep.<\/li>\n<li>Cloud sets up in 10-15 minutes. Cosmic ray tracks (mostly thin streaks) should\u00a0readily\u00a0appear.<\/li>\n<li>Use radiation sources to see alpha tracks (fat streaks).<\/li>\n<li>Needle source is lead 210; disk source is americium 241, extracted from a smoke detector.<\/li>\n<li>Footage of this cloud chamber in operation:\u00a0<a href=\"https:\/\/youtu.be\/1ss5DBGWMo4\">https:\/\/youtu.be\/1ss5DBGWMo4<\/a>\u00a0(sign in to YouTube to view).<\/li>\n<li>Located in L01, section C1.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><strong>radioactive sources<\/strong><\/p>\n<p><a href=\"http:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2.jpg\" rel=\"attachment wp-att-6003\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6003 aligncenter\" src=\"http:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2-169x300.jpg\" alt=\"cloud chbr2\" width=\"262\" height=\"465\" srcset=\"https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2-169x300.jpg 169w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2-768x1366.jpg 768w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2-576x1024.jpg 576w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2-772x1373.jpg 772w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2-351x624.jpg 351w, https:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2017\/10\/cloud-chbr2.jpg 1434w\" sizes=\"(max-width: 262px) 100vw, 262px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: center;\">Petri dish cloud chamber<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4729 aligncenter\" src=\"http:\/\/demos.swarthmore.edu\/physics\/wp-content\/uploads\/sites\/2\/2015\/06\/little-cloud-chamber.jpg\" alt=\"little cloud chamber\" width=\"422\" height=\"316\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: large;\">Instructions<\/span><\/p>\n<ul>\n<li><span style=\"font-size: large;\">Soak black paper with ethanol or highly concentrated isopropyl alcohol (93% or higher).<\/span><\/li>\n<li><span style=\"font-size: large;\">Insert radioactive source (Pb-210) into hole\u00a0on side of container.<\/span><\/li>\n<li><span style=\"font-size: large;\">Place chamber on slab of dry ice.<\/span><\/li>\n<li><span style=\"font-size: large;\">After 5 or 10 minutes of cooling down, clouds of supersaturated alcohol will form near bottom of container. Alpha particles or cosmic rays that streak through alcohol cloud ionize alcohol, causing it to condense along particle&#8217;s path.\u00a0<\/span><\/li>\n<li><span style=\"font-size: large;\">To illuminate tracks (to make more visible) shine a flashlight, or cell phone light, into side of container.<\/span><\/li>\n<li><span style=\"font-size: large;\">Getting alcohol cloud to form is a little bit tricky. Before attempting this demo in class, try it out.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: large;\">Located in L01, section C1.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Diffusion Cloud Chamber The Pasco Diffusion Cloud Chamber is very easy to set up and operate- does not require use of dry ice or liquid nitrogen. Use pump to circulate ice water through base. Peltier device cools chamber base down to -35 C. Soak paper liner with isopropyl alcohol (93% or higher), and pour alcohol &hellip; <a href=\"https:\/\/demos.swarthmore.edu\/physics\/2015\/06\/coud-chamber\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Cloud Chamber<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":6005,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50,56],"tags":[152],"_links":{"self":[{"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/posts\/3757"}],"collection":[{"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/comments?post=3757"}],"version-history":[{"count":10,"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/posts\/3757\/revisions"}],"predecessor-version":[{"id":6042,"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/posts\/3757\/revisions\/6042"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/media\/6005"}],"wp:attachment":[{"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/media?parent=3757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/categories?post=3757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/demos.swarthmore.edu\/physics\/wp-json\/wp\/v2\/tags?post=3757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}