ENS 58112

v t e ENS Event
06:00 Jan 9, 2026
Title	Medical Event
Event Description	The following information was provided by the Illinois Emergency Management Agency (the Agency) via phone and email: The Agency was contacted on January 9, 2026, by radiation safety staff at Northwestern Memorial Hospital to report that a patient prescribed 21.1 mCi (0.7807 GBq) of Y-90 TheraSpheres on that date received approximately 36 percent of the prescribed dose. A previously administered dose to the same patient was delivered without incident. The patient and referring physician were notified, and there was no reported adverse impact to the patient. The investigation is ongoing, and a reactive inspection will be conducted next week to review procedures and identify the possible root cause. This event meets the criteria for a reportable event under 32 Ill. Adm. Code 335.1080 and was reported to the NRC on January 9, 2026. Illinois item number: IL260001 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.

ENS 58112 +/-
Where
Northwestern Memorial Healthcare Chicago, Illinois (NRC Region 3)
License number:	IL-01037-02
Organization:	Illinois Emergency Mgmt. Agency
Reporting

Agreement State
Time - Person (Reporting Time:+10.45 h0.435 days <br />0.0622 weeks <br />0.0143 months <br />)
Opened:	Robin Muzzalupo 16:27 Jan 9, 2026
NRC Officer:	Sam Colvard
Last Updated:	Jan 9, 2026
58112 - NRC Website
v • d • e

v t e Emergency Notification System
Northwestern Memorial Healthcare with Agreement State
WEEKMONTHYEAR2026-01-09T06:00:00 [Table view]
[ENS list for Northwestern Memorial Healthcare]

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