{"id":7661,"date":"2026-08-09T13:50:33","date_gmt":"2026-08-09T17:50:33","guid":{"rendered":"https:\/\/laboratorytesting.com\/?page_id=7661"},"modified":"2026-08-09T14:08:43","modified_gmt":"2026-08-09T18:08:43","slug":"radium-226-and-radium-228","status":"publish","type":"page","link":"https:\/\/laboratorytesting.com\/pt\/resources\/radiochemistry\/radium-226-and-radium-228\/","title":{"rendered":"R\u00e1dio 226 e R\u00e1dio 228"},"content":{"rendered":"
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Radioqu\u00edmica - R\u00e1dio 226 e R\u00e1dio 228<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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O r\u00e1dio (Ra) \u00e9 um metal radioativo natural que existe em v\u00e1rios is\u00f3topos. Ele se forma quando o ur\u00e2nio (U) e o t\u00f3rio (Th) se desintegram no meio ambiente. Na natureza, o r\u00e1dio \u00e9 encontrado em baixas concentra\u00e7\u00f5es no solo, na \u00e1gua, nas rochas, no carv\u00e3o, nas plantas e nos alimentos. Com o tempo, o r\u00e1dio se desintegra, liberando r\u00e1dio-226, r\u00e1dio-228 e r\u00e1dio-224. Enquanto a meia-vida do r\u00e1dio-226 \u00e9 muito longa, de 1.600 anos, a do r\u00e1dio-228 \u00e9 de apenas 6,7 anos e a do r\u00e1dio-224 \u00e9 ainda mais curta, de 3,5 dias.<\/p>

\u00c0 medida que os diferentes is\u00f3topos se decomp\u00f5em, podem entrar no corpo atrav\u00e9s da ingest\u00e3o de alimentos, \u00e1gua ou absor\u00e7\u00e3o pela pele. Ao longo do tempo, a exposi\u00e7\u00e3o a esses is\u00f3topos pode levar a diversas doen\u00e7as e causar danos internos ao organismo. 1,2,3<\/sup>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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R\u00e1dio 226 e 228: Por que a an\u00e1lise demora tanto?<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A an\u00e1lise de r\u00e1dio-226 e r\u00e1dio-228 envolve a medi\u00e7\u00e3o da taxa de decaimento dos respectivos is\u00f3topos ao longo do tempo. Ap\u00f3s o preparo das amostras, o is\u00f3topo de r\u00e1dio-224, um produto de decaimento do r\u00e1dio-228, leva um tempo para decair. Podemos medir primeiro o r\u00e1dio-228 e, em seguida, o r\u00e1dio-226, ap\u00f3s o r\u00e1dio-224 ter deca\u00eddo quase completamente. Se uma amostra apresentar um alto n\u00edvel de r\u00e1dio-228, o tempo necess\u00e1rio para o decaimento ser\u00e1 maior. Devido \u00e0s tecnologias e instrumenta\u00e7\u00e3o atuais, n\u00e3o existe, no momento, um m\u00e9todo mais r\u00e1pido para realizar essas an\u00e1lises, atingindo os n\u00edveis de detec\u00e7\u00e3o exigidos pela EPA (Ag\u00eancia de Prote\u00e7\u00e3o Ambiental dos Estados Unidos).<\/p>

A an\u00e1lise \u00e9 apresentada em uma unidade padr\u00e3o de picocuries por litro (pCi\/L) ou microgramas por litro (\u00b5g\/L).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Recipiente para coleta de amostras de \u00e1gua<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Frasco para degusta\u00e7\u00e3o:<\/strong> 2 L
ID do produto EMSL:<\/strong> 8714201
Conservante:<\/strong> 5 mL de \u00e1cido n\u00edtrico
Requisitos de envio:<\/strong> N\u00e3o precisa de gelo
Tempo de espera:<\/strong> 6 meses a partir da coleta
Limite de detec\u00e7\u00e3o do m\u00e9todo EPA 904 para r\u00e1dio-226:<\/strong> 1 pCi\/L
Limite de detec\u00e7\u00e3o do m\u00e9todo EPA 903 para r\u00e1dio-228:<\/strong> 1 pCi\/L<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Diretrizes para Testes Radiol\u00f3gicos<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Resultados Alfa\/Beta Brutos<\/strong><\/th>Contamina\u00e7\u00e3o potencial<\/strong><\/th>Testes adicionais recomendados<\/strong><\/th>\n<\/tr>\n<\/thead>\n
< 5 pCi\/L<\/td>N\u00edveis de fundo<\/td>Nenhum<\/td>\n<\/tr>\n
5-15 pCi\/L<\/td>Poss\u00edvel r\u00e1dio<\/td>R\u00e1dio 226 e 228<\/td>\n<\/tr>\n
> 15 pCi\/L<\/td>Poss\u00edvel r\u00e1dio e ur\u00e2nio<\/td>R\u00e1dio 226, 228 e Ur\u00e2nio<\/td>\n<\/tr>\n
Tratamento recomendado se:<\/div><\/td>\n<\/tr>\n
R\u00e1dio-226 + R\u00e1dio-228 > 5 pCi\/L OU
\nAlfa bruto \u2013 Ur\u00e2nio > 15 pCi\/L OU
\nUr\u00e2nio > 30 \u00b5g\/L<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Lei da \u00c1gua Pot\u00e1vel Segura (SDWA)
\nPadr\u00f5es3,4<\/sup><\/th>		Limite m\u00e1ximo de contaminantes
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R\u00e1dio-226 + R\u00e1dio-228<\/td>5 pCi\/L<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Contador Alfa\/Beta<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Contador Alfa\/Beta<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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1<\/sup> (R\u00e1dio) \u2013 https:\/\/semspub.epa.gov\/work\/HQ\/176334.pdf<\/a>
2<\/sup> (Radionucl\u00eddeos) \u2013 https:\/\/www.epa.gov\/dwreginfo\/radionuclides-rule<\/a>
3<\/sup> (Radionucl\u00eddeos) \u2013 https:\/\/nepis.epa.gov\/Exe\/ZyPDF.cgi?Dockey=30006644.txt<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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CUIDADO: <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Os frascos para coleta de amostras cont\u00eam \u00e1cido n\u00edtrico como conservante, que pode facilmente causar queimaduras na pele e nas roupas. Por favor, use luvas ao manusear os frascos, evite ench\u00ea-los em excesso e respingar o conte\u00fado sobre voc\u00ea.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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O que \u00e9 um is\u00f3topo? <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Qualquer uma de duas ou mais esp\u00e9cies de \u00e1tomos de um elemento qu\u00edmico com o mesmo n\u00famero at\u00f4mico e comportamento qu\u00edmico quase id\u00eantico, mas com massa at\u00f4mica ou n\u00famero de massa diferente e propriedades f\u00edsicas diferentes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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O que \u00e9 meia-vida?<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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O tempo necess\u00e1rio para que uma subst\u00e2ncia radioativa perca 50% de sua radioatividade por decaimento \u00e9 conhecido como meia-vida.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Estado de origem<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Em 03\/12\/2020, n\u00f3s pode<\/span><\/strong> Aceitar amostras de:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Alabama<\/td>Indiana<\/td>Nova Iorque<\/td>\n<\/tr>\n
Colorado<\/td>Louisiana<\/td>Oklahoma<\/td>\n<\/tr>\n
Connecticut<\/td>Maine<\/td>Pensilv\u00e2nia<\/td>\n<\/tr>\n
Delaware<\/td>Maryland<\/td>Rhode Island<\/td>\n<\/tr>\n
Distrito de Col\u00fambia<\/td>Massachusetts<\/td>Vermont<\/td>\n<\/tr>\n
Fl\u00f3rida<\/td>Nova Hampshire<\/td>Virg\u00ednia<\/td>\n<\/tr>\n
Ge\u00f3rgia<\/td>Nova Jersey<\/td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Em 03\/12\/2020, n\u00f3s n\u00e3o pode<\/span><\/strong> Aceitar amostras de:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Alasca<\/td>Minnesota<\/td>Oregon<\/td>\n<\/tr>\n
Arizona<\/td>Missouri<\/td>Carolina do Sul<\/td>\n<\/tr>\n
Arkansas<\/td>Mississippi<\/td>Dakota do Sul<\/td>\n<\/tr>\n
Calif\u00f3rnia<\/td>Montana<\/td>Tennessee<\/td>\n<\/tr>\n
Hava\u00ed<\/td>Nebraska<\/td>Texas<\/td>\n<\/tr>\n
Idaho<\/td>Nevada<\/td>Utah<\/td>\n<\/tr>\n
Illinois<\/td>Novo M\u00e9xico<\/td>Washington<\/td>\n<\/tr>\n
Iowa<\/td>Carolina do Norte<\/td>Virg\u00ednia Ocidental<\/td>\n<\/tr>\n
Kansas<\/td>Dakota do Norte<\/td>Wisconsin<\/td>\n<\/tr>\n
Kentucky<\/td>Ohio<\/td>Wyoming<\/td>\n<\/tr>\n
Michigan<\/td><\/td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Radiochemistry – Radium 226 and Radium 228 Radium (Ra) is a naturally occurring radioactive metal that exists as one of several isotopes. It is formed when uranium (U) and thorium (Th) decay in the environment. In the natural environment, radium […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":7385,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"","footnotes":""},"class_list":["post-7661","page","type-page","status-publish","hentry","slug-radium-226-and-radium-228","odd_post_id"],"_links":{"self":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7661","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/comments?post=7661"}],"version-history":[{"count":10,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7661\/revisions"}],"predecessor-version":[{"id":7676,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7661\/revisions\/7676"}],"up":[{"embeddable":true,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7385"}],"wp:attachment":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/media?parent=7661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}