{"id":131044,"date":"2021-09-24T09:41:28","date_gmt":"2021-09-24T09:41:28","guid":{"rendered":"https:\/\/www.healthbenefitstimes.com\/glossary\/?p=131044"},"modified":"2023-05-22T04:33:56","modified_gmt":"2023-05-22T04:33:56","slug":"half-value-layer","status":"publish","type":"post","link":"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/","title":{"rendered":"Half-value-layer"},"content":{"rendered":"<p>The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters.<\/p>\n<hr \/>\n<p>The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)<\/p>\n<hr \/>\n<p>The thickness of a material (usually metal) when introduced in the path of radiation, will reduce the intensity of radiation to half of the initial value. Also called half-value thickness.<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters. The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-131044","post","type-post","status-publish","format-standard","hentry","category-h"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Half-value-layer - Definition of Half-value-layer<\/title>\n<meta name=\"description\" content=\"The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters.The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)The thickness of a material (usually metal) when introduced in the path of radiation, will reduce the intensity of radiation to half of the initial value. Also called half-value thickness.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Half-value-layer - Definition of Half-value-layer\" \/>\n<meta property=\"og:description\" content=\"The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters.The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)The thickness of a material (usually metal) when introduced in the path of radiation, will reduce the intensity of radiation to half of the initial value. Also called half-value thickness.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/\" \/>\n<meta property=\"og:site_name\" content=\"Glossary\" \/>\n<meta property=\"article:published_time\" content=\"2021-09-24T09:41:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-22T04:33:56+00:00\" \/>\n<meta name=\"author\" content=\"Glossary\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Glossary\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/\",\"url\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/\",\"name\":\"Half-value-layer - Definition of Half-value-layer\",\"isPartOf\":{\"@id\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/#website\"},\"datePublished\":\"2021-09-24T09:41:28+00:00\",\"dateModified\":\"2023-05-22T04:33:56+00:00\",\"author\":{\"@id\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/#\/schema\/person\/ccfef987a4882e6356ae6d77d33e74c5\"},\"description\":\"The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters.The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)The thickness of a material (usually metal) when introduced in the path of radiation, will reduce the intensity of radiation to half of the initial value. Also called half-value thickness.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Half-value-layer\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/#website\",\"url\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/\",\"name\":\"Glossary\",\"description\":\"Difinitions\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/#\/schema\/person\/ccfef987a4882e6356ae6d77d33e74c5\",\"name\":\"Glossary\",\"url\":\"https:\/\/www.healthbenefitstimes.com\/glossary\/author\/adminglossary\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Half-value-layer - Definition of Half-value-layer","description":"The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters.The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)The thickness of a material (usually metal) when introduced in the path of radiation, will reduce the intensity of radiation to half of the initial value. Also called half-value thickness.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/","og_locale":"en_US","og_type":"article","og_title":"Half-value-layer - Definition of Half-value-layer","og_description":"The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters.The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)The thickness of a material (usually metal) when introduced in the path of radiation, will reduce the intensity of radiation to half of the initial value. Also called half-value thickness.","og_url":"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/","og_site_name":"Glossary","article_published_time":"2021-09-24T09:41:28+00:00","article_modified_time":"2023-05-22T04:33:56+00:00","author":"Glossary","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Glossary","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/","url":"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/","name":"Half-value-layer - Definition of Half-value-layer","isPartOf":{"@id":"https:\/\/www.healthbenefitstimes.com\/glossary\/#website"},"datePublished":"2021-09-24T09:41:28+00:00","dateModified":"2023-05-22T04:33:56+00:00","author":{"@id":"https:\/\/www.healthbenefitstimes.com\/glossary\/#\/schema\/person\/ccfef987a4882e6356ae6d77d33e74c5"},"description":"The amount of material required to attenuate a beam of radiation to one-half of its original level. Units are given in lengths, such as centimeters.The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)The thickness of a material (usually metal) when introduced in the path of radiation, will reduce the intensity of radiation to half of the initial value. Also called half-value thickness.","breadcrumb":{"@id":"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.healthbenefitstimes.com\/glossary\/half-value-layer\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.healthbenefitstimes.com\/glossary\/"},{"@type":"ListItem","position":2,"name":"Half-value-layer"}]},{"@type":"WebSite","@id":"https:\/\/www.healthbenefitstimes.com\/glossary\/#website","url":"https:\/\/www.healthbenefitstimes.com\/glossary\/","name":"Glossary","description":"Difinitions","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.healthbenefitstimes.com\/glossary\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.healthbenefitstimes.com\/glossary\/#\/schema\/person\/ccfef987a4882e6356ae6d77d33e74c5","name":"Glossary","url":"https:\/\/www.healthbenefitstimes.com\/glossary\/author\/adminglossary\/"}]}},"_links":{"self":[{"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/posts\/131044","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/comments?post=131044"}],"version-history":[{"count":4,"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/posts\/131044\/revisions"}],"predecessor-version":[{"id":225569,"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/posts\/131044\/revisions\/225569"}],"wp:attachment":[{"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/media?parent=131044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/categories?post=131044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.healthbenefitstimes.com\/glossary\/wp-json\/wp\/v2\/tags?post=131044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}