{"id":937,"date":"2025-10-20T00:02:10","date_gmt":"2025-10-20T03:02:10","guid":{"rendered":"https:\/\/wcwdigital.com\/noticias\/cesio-137-em-rio-paulista-revela-impacto-humano-e-marca-epoca-geologica\/"},"modified":"2025-10-30T00:23:55","modified_gmt":"2025-10-30T03:23:55","slug":"cesio-137-em-rio-paulista-impacto-humano-que-marcou-epoca","status":"publish","type":"post","link":"https:\/\/wcwdigital.com\/noticias\/cesio-137-em-rio-paulista-impacto-humano-que-marcou-epoca\/","title":{"rendered":"C\u00e9sio-137 em Rio Paulista Revela Impacto Humano e Marca \u00c9poca Geol\u00f3gica"},"content":{"rendered":"\n

As a\u00e7\u00f5es humanas deixaram marcas detect\u00e1veis na geologia da Terra com o C\u00e9sio-137 em Rio Paulista. Um estudo da USP identificou C\u00e9sio-137 (Cs-137) em sedimentos do rio Ribeira de Iguape, interior de S\u00e3o Paulo. <\/p>\n\n\n\n

Essa subst\u00e2ncia, dispersa na atmosfera e transportada pelo ar, se acumula em solos e bacias hidrogr\u00e1ficas, servindo como um marcador temporal para o Antropoceno. O Antropoceno \u00e9 uma \u00e9poca geol\u00f3gica cujo in\u00edcio formal ainda \u00e9 debatido entre cientistas.<\/p>\n\n\n\n

O C\u00e9sio-137 encontrado n\u00e3o est\u00e1 relacionado ao acidente radiol\u00f3gico de Goi\u00e2nia de 1987, e os n\u00edveis identificados n\u00e3o representam riscos \u00e0 sa\u00fade.<\/p>\n\n\n\n

Segundo o ge\u00f3grafo Breno Schimidtke Rodrigues, autor da pesquisa, delimitar o Antropoceno significa reconhecer a for\u00e7a geol\u00f3gica da a\u00e7\u00e3o humana e sua capacidade de provocar mudan\u00e7as no planeta. <\/p>\n\n\n\n

Ele defende a formula\u00e7\u00e3o de pol\u00edticas p\u00fablicas e o desenvolvimento de solu\u00e7\u00f5es tecnol\u00f3gicas para mitigar os danos ambientais.<\/p>\n\n\n\n

A disserta\u00e7\u00e3o, defendida na Faculdade de Filosofia, Letras e Ci\u00eancias Humanas (FFLCH) da USP em junho de 2025, analisou marcadores radioisot\u00f3picos do Antropoceno em sistemas fluviais me\u00e2ndricos, identificando tra\u00e7os de Cs-137 no baixo Ribeira (SP).<\/p>\n\n\n\n

O pesquisador explica que n\u00e3o h\u00e1 consenso sobre a data de in\u00edcio do Antropoceno. Algumas correntes cient\u00edficas o associam \u00e0 Revolu\u00e7\u00e3o Industrial, enquanto outras apontam para a “grande acelera\u00e7\u00e3o” a partir de 1950.<\/p>\n\n\n\n

E foi caracterizada pelo crescimento populacional, aumento no consumo de energia, intensifica\u00e7\u00e3o da explora\u00e7\u00e3o mineral e emiss\u00f5es de gases de efeito estufa. H\u00e1 ainda quem defenda uma origem mais remota, ligada ao dom\u00ednio do fogo.<\/p>\n\n\n\n

Rodrigues afirma que a presen\u00e7a de C\u00e9sio-137 \u00e9 apenas uma das evid\u00eancias das transforma\u00e7\u00f5es provocadas pela a\u00e7\u00e3o humana. Ele aponta que o elemento radioativo encontrado no rio se originou em testes nucleares realizados durante a Guerra Fria.<\/p>\n\n\n\n

C\u00e9sio-137 em Rio Paulista foi atribu\u00eddo a minera\u00e7\u00e3o e urbaniza\u00e7\u00e3o<\/h2>\n\n\n
\n
\"C\u00e9sio-137<\/figure>\n<\/div>\n\n\n

O pesquisador tamb\u00e9m destaca que a minera\u00e7\u00e3o, agricultura e urbaniza\u00e7\u00e3o geram altera\u00e7\u00f5es significativas nos ecossistemas. O desmatamento da Amaz\u00f4nia, por exemplo, eliminou uma \u00e1rea de vegeta\u00e7\u00e3o equivalente ao tamanho da Fran\u00e7a em 4 d\u00e9cadas, impactando a biodiversidade e os processos hidrol\u00f3gicos.<\/p>\n\n\n\n

O rio Ribeira de Iguape, com cerca de 470 km de extens\u00e3o, \u00e9 considerado um dos mais importantes do estado de S\u00e3o Paulo e o maior rio “vivo” do estado, sem barragens.<\/p>\n\n\n\n

A pesquisa coletou amostras em quatro pontos da plan\u00edcie fluvial do rio Ribeira de Iguape, confirmando a presen\u00e7a de C\u00e9sio-137<\/a> em concentra\u00e7\u00f5es distintas. Os maiores picos foram registrados na bacia de decanta\u00e7\u00e3o e no meandro abandonado. <\/p>\n\n\n\n

A pesquisa tamb\u00e9m identificou um pico de concentra\u00e7\u00e3o de C\u00e9sio-137 em 1963, per\u00edodo marcado pela maior chuva radioativa j\u00e1 registrada no mundo, resultado dos testes nucleares da Guerra Fria.<\/p>\n\n\n\n

O ge\u00f3grafo explica que os tra\u00e7os de c\u00e9sio associados \u00e0 “grande acelera\u00e7\u00e3o” funcionam como um “carimbo geol\u00f3gico” que evidencia o impacto da humanidade na hist\u00f3ria da Terra.<\/p>\n\n\n\n

Sobre a sa\u00fade p\u00fablica, Rodrigues informa que os n\u00edveis encontrados s\u00e3o muito baixos, residuais e n\u00e3o oferecem preocupa\u00e7\u00e3o quanto \u00e0 seguran\u00e7a radiol\u00f3gica. <\/p>\n\n\n\n

Pesquisas anteriores tamb\u00e9m identificaram C\u00e9sio-137 em \u00e1reas marinhas pr\u00f3ximas \u00e0 costa brasileira em valores similares e sem risco significativo \u00e0 sa\u00fade humana.<\/p>\n\n\n\n

Fonte: www.poder360.com.br<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

As a\u00e7\u00f5es humanas deixaram marcas detect\u00e1veis na geologia da Terra com o C\u00e9sio-137 em Rio Paulista. Um estudo da USP identificou C\u00e9sio-137 (Cs-137) em sedimentos […]<\/p>\n","protected":false},"author":1,"featured_media":938,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5],"tags":[215,214,152,216,42],"class_list":["post-937","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-politica","tag-antropoceno","tag-cesio","tag-nao","tag-ribeira","tag-rio"],"acf":[],"yoast_head":"\nC\u00e9sio-137 em Rio Paulista: Impacto Humano Que Marcou \u00c9poca<\/title>\n<meta name=\"description\" content=\"As a\u00e7\u00f5es humanas deixaram marcas detect\u00e1veis na geologia da Terra com o C\u00e9sio-137 em Rio Paulista. 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