Staff at Countess of Chester Hospital are among the thousands of NHS employees across the UK that have had personal details stolen from the servers of private contractor Landauer.
Last month, it was revealed that information including names, birthdates, National Insurance numbers and radiation doses had been taken from NHS medical staff in Wales, Scotland and England.
The data had been held by Landauer, a US-based radiation monitoring company, which works with the NHS to ensure that radiology staff are not exposed to harmful levels of radiation.
Several NHS bodies have come forward stating that they have been affected by the breach, including University Hospital Southampton NHS Foundation Trust, Guy's and St Thomas' NHS Foundation Trust, NHS Ayshire and Arran, Velindre NHS Trust and Betsi Cadwaladr University Health Board.
Now, the Countess of Chester Hospital NHS Foundation Trust has also revealed that nearly 300 of its staff have been affected by the breach.
In a statement the trust said there were 37 members of staff that have had their name, dosage and dates of birth compromised, while two members of staff had their name, dosage and National Insurance numbers compromised.
The Trust said that these individuals "have been provided with two years free access to a fraud monitoring service by Landauer".
A further 259 staff had their name and radiation dosage compromised.
"A large number of NHS organisations have been affected by this incident and we have reviewed and reported this to the Information Commissioner's Office, as has the contractor," said Alison Kelly, director of nursing at the Countess of Chester and senior information risk owner for the Trust.
Landauer has admitted that one of its UK servers was the target of a security breach in late 2016, which resulted in client data being compromised.
It added that its security team secured its UK systems within 24 hours of any data being compromised "to ensure that the data compromised was kept to a minimum".
It continued: "Following the incident, we engaged a leading global firm of forensic IT specialists to conduct a thorough investigation to identify the scope of data compromised. We are confident that we have identified all affected clients and have undertaken a programme to notify them of the incident."
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