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The following information was provided by … The following information was provided by the California Radiation Control Program, Radiologic Health Branch (RHB), via email:</br>On January 20, 2026, at approximately 1841 PST, the radiation safety officer and Associate Director of Environmental Health & Safety at Cedars Sinai Medical Center contacted RHB to report a medical event that occurred earlier that same day. The event involved an underdose to a patient during a radioembolization treatment for liver cancer using yttrium-90 (Y-90) TheraSphere microspheres. The prescribed activity was 3.01 GBq. Approximately 88.5 percent of the activity remained as residual activity (in the administration kit) due to a kink in the microcatheter used for delivery of the Y-90 microspheres.</br>Cedars Sinai Medical Center will investigate to gain a better understanding of the details of the event. RHB will also investigate the medical event, to include the licensee's investigation results.</br>California 5010 number: 012026</br>A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.not necessarily result in harm to the patient. +
02:41:00, 21 January 2026 +
58,125 +
18:27:00, 21 January 2026 +
02:41:00, 21 January 2026 +
The following information was provided by … The following information was provided by the California Radiation Control Program, Radiologic Health Branch (RHB), via email:</br>On January 20, 2026, at approximately 1841 PST, the radiation safety officer and Associate Director of Environmental Health & Safety at Cedars Sinai Medical Center contacted RHB to report a medical event that occurred earlier that same day. The event involved an underdose to a patient during a radioembolization treatment for liver cancer using yttrium-90 (Y-90) TheraSphere microspheres. The prescribed activity was 3.01 GBq. Approximately 88.5 percent of the activity remained as residual activity (in the administration kit) due to a kink in the microcatheter used for delivery of the Y-90 microspheres.</br>Cedars Sinai Medical Center will investigate to gain a better understanding of the details of the event. RHB will also investigate the medical event, to include the licensee's investigation results.</br>California 5010 number: 012026</br>A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.not necessarily result in harm to the patient. +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
Yttrium-90 + and Y-90 +
00:00:00, 21 January 2026 +
0404-19 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
18:03:24, 2 February 2026 +
18:27:00, 21 January 2026 +
Processing error"Processing error" is a predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> and represents errors that appeared in connection with improper value annotations or input processing.
0.657 d (15.77 hours, 0.0939 weeks, 0.0216 months) +
02:41:00, 21 January 2026 +
Underdose + and TheraSphere +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.