{"id":37,"date":"2020-01-28T12:20:44","date_gmt":"2020-01-28T15:20:44","guid":{"rendered":"http:\/\/sites.igc.usp.br\/legal\/?page_id=37"},"modified":"2023-11-17T16:46:31","modified_gmt":"2023-11-17T19:46:31","slug":"area-do-usuario","status":"publish","type":"page","link":"https:\/\/igc.usp.br\/legal\/area-do-usuario\/","title":{"rendered":"USER GUIDELINES"},"content":{"rendered":"\n

This page contains the details for commissioning luminescence dating and sensitivity analyses at the Luminescence and Gamma Spectrometry Laboratory, Institute of Geosciences at University of S\u0101o Paulo, Brazil.<\/p>\n\n\n\n

Comissioning:<\/strong> MultiSed<\/a> (info on analysis and price quotation)<\/p>\n\n\n\n

Before commissioning analyses, contact the laboratory to consult on the suitability of the applied methodology to your needs and to pre-schedule the period of analyses. Ideally, contact the laboratory prior to sample collection to inform site location and type of sediment, and to consult on sampling and luminescence analysis strategy. <\/p>\n\n\n\n

When results produced at LEGAL are being published, proper acknowledgment must be included in the \u201cMaterials and Methods\u201d section of the publication.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Sample collection:<\/strong><\/h4>\n\n\n\n

Sampling for luminescence dating must be in accordance to the following procedure: OSL Sampling Protocol<\/a><\/p>\n\n\n\n

<\/p>\n\n\n\n

Registration for dosimeter:<\/strong><\/h4>\n\n\n\n

All users must have their own dosimeter while attending our facilities. The dosimeters must be requested in advance, and it is necessary to have a brazilian CPF number for the registration. Foreigners can also obtain a CPF number (click here<\/a>). Once you are scheduled to use the lab, send the copy of your CPF to legal@usp.br<\/em> <\/p>\n\n\n\n

<\/p>\n\n\n\n

User registration:<\/strong><\/h4>\n\n\n\n

Fill out the registration form for each batch of samples: Sample Registration Form<\/a><\/p>\n\n\n\n

<\/p>\n\n\n\n

Sample preparation protocols:<\/strong><\/h4>\n\n\n\n

OSL dating is routinely performed on quartz or feldspar grains in sand (63 – 250 \u00b5m) or fine silt fraction (entre 4 e 11 \u00b5m). The following tables 1 and 2 describe the procedures for the concentration of quartz and feldspar grains in sand and fine silt fraction:<\/p>\n\n\n\n

Table 1. <\/strong>Steps for sample preparation of quartz or feldspar in fine to very fine sand fraction.<\/p>\n\n\n\n

1<\/td>Opening of samples under subdued orange\/red light. Discard portions that were exposed to the light during field sampling. *<\/td><\/tr>
2<\/td>Wet sieving of 180 – 250 \u00b5m (or 63 – 125 \u00b5m or 125-180 \u00b5m) fraction <\/td><\/tr>
3<\/td>H2<\/sub>O2<\/sub> treatment <\/td><\/tr>
4<\/td>10% HCl treatment <\/td><\/tr>
5<\/td>Drying for ~24h <\/td><\/tr>
6<\/td>Mineral separation with LMT liquid (click here to see mineral separation protocol<\/a>)<\/td><\/tr>
7<\/td>40% HF (quartz) or 10% HF (feldspar) treatment<\/td><\/tr>
8<\/td>10% HCl treatment (optional)<\/td><\/tr>
9<\/td>Dry sieving<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Table 2. <\/strong>Steps for sample preparation of polymineral silt fraction.<\/p>\n\n\n\n

1<\/td>Opening of samples under subdued orange\/red light. Discard portions that were exposed to the light during field sampling. *<\/td><\/tr>
2<\/td>Wet sieving of < 63 \u00b5m fraction <\/td><\/tr>
3<\/td>Settling for separation of 4 – 11 \u00b5m fraction (click here to see silt preparation protocol<\/a>)<\/td><\/tr>
4<\/td>H2<\/sub>O2<\/sub> treatment <\/td><\/tr>
5<\/td>10% HCl treatment <\/td><\/tr>
6<\/td>Storage of the silt fraction in acetone solution<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

<\/p>\n\n\n\n

Radioprotection manual (portuguese): CNEN RadioProtection Handout<\/a><\/p>\n\n\n\n

<\/p>\n\n\n\n

Software for data processing:<\/strong><\/h4>\n\n\n\n

Analyst and Ris\u00f8 TL\/OSL Softwares: click here<\/a><\/p>\n\n\n\n

Superplanilha latest version (2022.6.15 – June 2022): click here<\/a><\/p>\n\n\n\n

R Luminescence package: click here<\/a> <\/p>\n\n\n\n

LDAC: click here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

This page contains the details for commissioning luminescence dating and sensitivity analyses at the Luminescence and Gamma Spectrometry Laboratory, Institute of Geosciences at University of…<\/p>\n","protected":false},"author":12,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-37","page","type-page","status-publish","hentry"],"acf":[],"aioseo_notices":[],"publishpress_future_action":{"enabled":false,"date":"2026-05-21 08:26:10","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"language","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/pages\/37","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/comments?post=37"}],"version-history":[{"count":37,"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/pages\/37\/revisions"}],"predecessor-version":[{"id":829,"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/pages\/37\/revisions\/829"}],"wp:attachment":[{"href":"https:\/\/igc.usp.br\/legal\/wp-json\/wp\/v2\/media?parent=37"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}