{"id":25422,"date":"2024-02-24T12:41:49","date_gmt":"2024-02-24T12:41:49","guid":{"rendered":"https:\/\/www.africa-press.net\/benin\/politique\/ce-metal-blanc-argente-est-400-fois-plus-cher-que-lor"},"modified":"2024-02-24T13:03:38","modified_gmt":"2024-02-24T13:03:38","slug":"ce-metal-blanc-argente-est-400-fois-plus-cher-que-lor","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/benin\/economie\/ce-metal-blanc-argente-est-400-fois-plus-cher-que-lor","title":{"rendered":"Ce m\u00e9tal blanc-argent\u00e9 est 400 fois plus cher que l\u2019or"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Benin. <\/strong><\/span><b>Le californium n\u2019existe pas a\u0300 l\u2019e\u0301tat naturel sur Terre. Son proce\u0301de\u0301 de fabrication e\u0301tant aussi long qu\u2019one\u0301reux, il s\u2019agit d\u2019un e\u0301le\u0301ment synthe\u0301tique beaucoup plus cher que l\u2019or. Par ailleurs, ce me\u0301tal est e\u0301galement tre\u0300s pre\u0301cieux dans une de ses formes en raison de ses utilisations industrielles et scientifiques.<\/b><br \/>\n<b>Une fabrication longue et one\u0301reuse<\/b><\/p>\n<p>Peu connu du grand public, le californium est l\u2019e\u0301le\u0301ment chimique de nume\u0301ro atomique 98 dans le tableau pe\u0301riodique des e\u0301le\u0301ments. Il s\u2019agit d\u2019un me\u0301tal blanc-argente\u0301 synthe\u0301tique et malle\u0301able qui peut se de\u0301former de manie\u0300re importante sans se rompre. Synthe\u0301tise\u0301 pour la premie\u0300re fois en 1950, il cou\u0302te environ 27 millions de dollars le gramme, comme l\u2019expliquait Medium dans un article publie\u0301 en 2023. Ainsi, ce me\u0301tal est 400 fois plus cher que l\u2019or. Son prix s\u2019explique par la prouesse que repre\u0301sente son obtention, mais aussi parce que l\u2019ope\u0301ration est seulement possible au sein d\u2019un re\u0301acteur nucle\u0301aire.<\/p>\n<p>Le californium-252 (Cf-252) est un radio-isotope. Il fait donc partie des formes instables qui e\u0301mettent des rayonnements afin de se transformer en isotopes stables. Au c\u0153ur du re\u0301acteur, le californium est bombarde\u0301 de plutonium-239 a\u0300 l\u2019aide de neutrons avant une purification, un procorde\u0301 long et tre\u0300s one\u0301reux. De plus, cette ope\u0301ration ne\u0301cessite un e\u0301quipement spe\u0301cial ainsi qu\u2019une expertise de pointe. Il faut dire que la fabrication est une source d\u2019e\u0301mission de particules tre\u0300s dangereuses: des particules neutroniques et alpha. Par ailleurs, soulignons la faible demande en Cf-252, ainsi que sa tre\u0300s courte demi-vie (environ deux ans).<\/p>\n<p><b>Quelles applications pour le californium-252 ?<\/b><\/p>\n<p>Outre sa valeur e\u0301conomique estime\u0301e, le californium-252 est aussi et surtout tre\u0300s pre\u0301cieux en raison de ses utilisations industrielles et scientifiques. Le me\u0301tal contribue a\u0300 la stabilite\u0301 et a\u0300 la su\u0302rete\u0301 des re\u0301acteurs nucle\u0301aires en intervenant dans le contro\u0302le du taux de fission nucle\u0301aire. Il est e\u0301galement possible de l\u2019utiliser pour mesurer avec une grande pre\u0301cision les gisements de pe\u0301trole situe\u0301s en profondeur.<\/p>\n<p>Cependant, il trouve aussi des applications dans le domaine de la me\u0301decine. En effet, le californium-252 permet la neutronthe\u0301rapie, a\u0300 savoir la destruction des cellules cance\u0301reuses de manie\u0300re efficace sans endommager les tissus a\u0300 proximite\u0301. Il s\u2019agit donc d\u2019un formidable atout dans la lutte contre le cancer.<\/p>\n<p>Enfin, il faut savoir que le californium-252 a fait parler de lui en 2023, dans le cadre de la guerre en Ukraine. En effet, la Russie accusait l\u2019Ukraine de pre\u0301parer des bombes sales apre\u0300s la re\u0301ception de conteneurs de substances radioactives, dont le californium-252, depuis l\u2019un des e\u0301tats de l\u2019Union europe\u0301enne.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/benin\">Benin<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Benin. Le californium n\u2019existe pas a\u0300 l\u2019e\u0301tat naturel sur Terre. Son proce\u0301de\u0301 de fabrication e\u0301tant aussi long qu\u2019one\u0301reux, il s\u2019agit d\u2019un e\u0301le\u0301ment synthe\u0301tique beaucoup plus cher que l\u2019or. Par ailleurs, ce me\u0301tal est e\u0301galement tre\u0300s pre\u0301cieux dans une de ses formes en raison de ses utilisations industrielles et scientifiques. Une fabrication longue et [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":25421,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,10],"tags":[36,50,45],"class_list":["post-25422","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-economie","category-toutes-les-actualites","tag-africa-press","tag-africa-press-benin","tag-benin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ce m\u00e9tal blanc-argent\u00e9 est 400 fois plus cher que l\u2019or - B\u00e9nin<\/title>\n<meta name=\"description\" content=\"Le californium n\u2019existe pas a\u0300 l\u2019e\u0301tat naturel sur Terre. 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