**Introduction**

The concern about working in an office directly above an X-ray lab is valid given the potential for radiation exposure. This article explores the UK’s legal framework for radiation protection, the effects of different types of X-ray equipment, and practical steps to assess and mitigate potential risks.

Understanding Radiation Regulations in the UK

In the United Kingdom, the statutory dose limit for the public in a non-radiation area is 2.5 microSv per hour. If the dose rate exceeds this threshold, the area must be managed according to specific regulations. Supervised areas are required when the dose rate is 2.5 microSv per hour, whereas controlled areas, managed by a radiation protection officer or a designated person, are needed if the dose rate is 7.5 microSv per hour.

Factors Affecting Radiation Exposure

The amount of radiation that can penetrate the floor and affect the office area depends on the specific type of X-ray equipment being used. A mammography machine typically produces radiation that is insufficient to penetrate a concrete floor. However, equipment used for cancer treatments, such as linear accelerators (LINAC) or betatrons, can emit high-energy photons that may pass through concrete with relative ease.

This variability makes it crucial to know specifics about the X-ray machinery in use above the office. Direct communication with the radiation protection officer (RPO) or health physics expert is essential to understand the nature of the operations and the potential risks.

Practical Steps for Assessing Radiation Levels

Since it's difficult to ascertain radiation levels without professional assessment, it is advisable to request a measurement of the office area. This can be done by requesting dosimeters to be placed in strategic locations.

Radiation Dosimeter Placement

To conduct an effective dosimeter survey, place five dosimeters in key locations within the office space:

One on the surface of your torso, preferably at the highest point or where you spend most time. One in the bottom drawer of your desk. One on the back of your chair. One on the floor, under a pot plant or similar spot.

If any dosimeters record a higher dose than the background level after a month, it is important to maintain the dosimeters in their current positions and discuss the findings with your union's health and safety representative, the RPO, or seek legal advice.

Analysis of Dosimeter Results

If the dosimetry results indicate higher radiation levels in the higher parts of the office, this could suggest leakage from the room above. Consult with the RPO to understand the source and extent of the radiation and any necessary mitigation measures.

Conclusion and Next Steps

While this article provides general guidance, it is recommended that if you feel at risk, you seek expert advice from the RPO or other relevant professionals, such as health and safety experts or legal advisors. Ensuring your workplace environment is safe and compliant with UK radiation protection regulations is of utmost importance.