RSS feed source: International Atomic Energy Association--Nuclear & Radiological Events

Worker Exceeded Annual Whole Body Dose Limit

Print View Posted on: 23 December 2025

Event Date: 19 August 2025 Event Type: Radiation Source Event Location: Germany, Bavaria / Company for Material Testing INES Rating: 2 (Final)

On 19.08.2025, an employee of a company carried out a non-destructive testing using a Se-75 source with an activity of 1.95 TBq. When winding back the source into its safety position in a tube, the source detached from its holder, so that the source remained in the collimator. When the radiation officer entered the bunker his electronic radiation protection dosimeter gave a warning signal. The radiation officer covered the tube and the collimator with several layers of lead. In total the worker stayed 10 seconds at a distance of 1 m close to the source. The monthly evaluation of the official dosimeter provided a value of 49.7 mSv for August 2025 exceeding the statutory annual whole body dose limit for workers.

INES Rating: 2 – Incident (Final) as per 22 December 2025

Impact on people and the environment

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RSS feed source: International Atomic Energy Association--Nuclear & Radiological Events

Isolating S8 building of Natanz facility

Print View Posted on: 09 December 2025

Event Date: 09 December 2025 Event Type: Other Event Location: Iran, Islamic Republic of, Natanz facility INES Rating: Not provided

Following our previous reports, in order to prevent dispersion of radioactive material inside the Natanz facility, taking into account the weather forecast, one of the building inside the facility (S8) has already been surrounded and isolated and is going to be covered with a water-resistant material.

INES Rating: Not provided

Impact on people and the environment Release beyond authorized limits? No Overexposure of a member of the public? No Overexposure of a worker? No Impact on the radiological barriers and controls at facilities Contamination spread within the facility? No Damage to radiological barriers (incl. fuel damage) within the facility? No

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RSS feed source: International Atomic Energy Association--Nuclear & Radiological Events

Radiation worker exposure exceeding 10 times the annual limit

Print View Posted on: 27 November 2025

Event Date: 01 September 2025 Event Type: Irradiation/Accelerator Facility Event Location: Czech Republic, Roztoky u Prahy, museum INES Rating: 3 (Provisional)

The museum in Roztoky near Prague operates an irradiation chamber that is used to destroy insects in collection items with gamma radiation. For this purpose, a sealed radionuclide source of Co-60 with an actual activity of 127 TBq on the date of the event is used.

On 1. 9. 2025, a radiation worker was exposed to radiation by entering the irradiation chamber to bring another object into it for irradiation at a time when the emitter was extended in the working position and irradiation was taking place. The worker was moving in a field of ionizing radiation for about 1 to 2 minutes. The worker was equipped only with a personal film dosimeter, he left the operational dosimeter in the office. After closing the shielding door, he realized his mistake and reported the incident to his superior.
After evaluating the personal film dosimeter that the worker was wearing, an effective dose of 320 mSv was

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RSS feed source: International Atomic Energy Association--Nuclear & Radiological Events

Radiation worker exposure

Print View Posted on: 07 October 2025

Event Date: 13 January 2025 Event Type: Irradiation/Accelerator Facility Event Location: Czech Republic, Nuclear Physics Institute, Praha INES Rating: 2 (Final)

On 13. 1. 2025, the lcencee reported a radiation emergency when an unplanned radiation exposure of a radiation worker occurred. The worker was in the radiation room with a source of ionizing radiation – the Chisostat SO 1 irradiator, which contained a sealed radionuclide source (“URZ”) Co-60 with an activity of 30TBq as of 13. 1. 2025. At the time of the preparatory work, the source was not in a shielded position. The total time the worker spent in the radiation room during 2 entries (7. 1. 2025 and 13. 1. 2025) was about 12.5 minutes.

The investigation found that the last time the irradiator was used on 18. 12. 2024, it was incorrectly turned off. The irradiator was turned off by the main circuit breaker (not via the main control console), therefore the source was not put into the shielded position. It was also found that the backup power source (UPC), which would ensure the insertion of the

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