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Radiation protection standards for radiosynovectomy (RS) is limited. Yttrium\u201090 is a beta\u2010emitting radioisotope used in RS to treat joint pain from haemophilic arthritis. ICRP 94 states that if a patient is treated with up to 200\u00a0MBq, there is no need for further precautions when it comes to public exposure, however, activities can go up to 370\u00a0MBq in RS for the knee. This study analysed 119 family members\u2019 safety (16.7% pregnant women). The ambient dose equivalent rate was measured within four distances. A survey was carried analysing risk groups and time spent next to patients. Results showed that family members should be advised to remain at 1.0\u00a0m from the patient to decrease accumulated dose by 97.6%. The dose per activity factors estimated in this study is also a useful tool during the risk assessment and doctor\/patient communication. Pamphlets were distributed with radiation protection recommendations. Ambient dose equivalent was low enough to show that RS is a safe procedure for family members, which is essential to promote adherence to RS in countries where it is needed but not performed due to lack of information on radiation safety.<\/jats:p>","DOI":"10.1111\/hae.13710","type":"journal-article","created":{"date-parts":[[2019,3,13]],"date-time":"2019-03-13T22:26:59Z","timestamp":1552516019000},"page":"509-513","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Outpatient treatment for haemophilic arthropathy with radiosynovectomy: Radiation dose to family members"],"prefix":"10.1111","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8374-6075","authenticated-orcid":false,"given":"Susie","family":"Oliveira","sequence":"first","affiliation":[{"name":"Radiology Departament, Clementino Fraga Filho University Hospital Federal University of Rio de Janeiro Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2375-8602","authenticated-orcid":false,"given":"Sylvia","family":"Thomas","sequence":"additional","affiliation":[{"name":"Nuclear Medicine Department, Clementino Fraga Filho University Hospital Federal University of Rio de Janeiro Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clara Lorena Gl\u00f3ria","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Nuclear Medicine Department, Clementino Fraga Filho University Hospital Federal University of Rio de Janeiro Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mirta Barbara Torres","family":"Berdeguez","sequence":"additional","affiliation":[{"name":"Nuclear Engineering Department, Alberto Luiz Coimbra Institute of Post Graduation and Engineering Research Federal University of Rio de Janeiro Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lidia Vasconcellos","family":"de Sa","sequence":"additional","affiliation":[{"name":"Medical Physics Department Radiation Protection and Dosimetry Institute Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7901-4805","authenticated-orcid":false,"given":"Sergio Augusto Lopes","family":"de Souza","sequence":"additional","affiliation":[{"name":"Radiology Departament, Clementino Fraga Filho University Hospital Federal University of Rio de Janeiro Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,3,13]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2516.2012.02909.x"},{"key":"e_1_2_6_3_1","first-page":"2","article-title":"The 2007 recommendations of the International Commission on Radiological Protection. 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