HEALTH AT WORK

Industrial Health

Radiation Exposure at Work: Health Risks and Employer Duties

17 October 2026 · Health at Work · AI-assisted draft

Photo: Daria Rohova / Pexels

Ionising radiation is one of the most carefully managed hazards in any workplace where it appears - and yet it remains widely misunderstood by the workers it affects most. People tend to think of radiation exposure as something catastrophic and visible, linked to dramatic accidents rather than the quiet, cumulative exposure that actually drives occupational ill health. The reality is more mundane and more dangerous: most occupational radiation harm builds slowly, across years of low-level exposure, and the early signs are easy to dismiss or attribute to something else entirely.

What Ionising Radiation Actually Is, and Why It Harms the Body

Ionising radiation is energy released by unstable atomic nuclei as they decay. It takes several forms - alpha particles, beta particles, gamma rays, and X-rays - each with different penetrating power and different implications for exposure control. Alpha particles cannot penetrate the outer layer of skin but become extremely dangerous if inhaled or ingested. Beta particles can penetrate a few centimetres into tissue. Gamma rays and X-rays pass through the body entirely and require dense shielding to stop them.

The harm comes from what happens at the cellular level. When ionising radiation passes through living tissue, it strips electrons from atoms and molecules, breaking chemical bonds, damaging cell membranes, and - most critically - breaking strands of DNA. The body has repair mechanisms for this, and low-level exposure triggers repair responses that usually work. But repair is imperfect. Errors accumulate. Over years and decades, damaged DNA that is repaired incorrectly can lead to cancer. High acute doses overwhelm the repair system altogether, causing radiation sickness within hours or days.

There is no threshold below which ionising radiation carries zero risk to DNA. This is not alarmist: it is the scientific consensus on which occupational exposure standards worldwide are based, and it is why the guiding principle in radiation protection is to keep exposure as low as reasonably achievable - not simply below a limit.

Which Workers Are Actually Exposed, and in Which Tasks

Occupational radiation exposure is far broader than most people imagine. The first group most people think of - nuclear industry workers - represents a relatively small proportion of the total exposed workforce globally. The larger populations at risk are in healthcare, industrial testing, and mining.

In healthcare settings, radiographers, radiologists, theatre staff assisting in fluoroscopy-guided procedures, interventional cardiology teams, and nuclear medicine technicians all face regular exposure. The highest doses in this group tend to fall on staff who work in catheterisation laboratories and interventional radiology suites, where procedures can last an hour or more with the X-ray source active throughout. Healthcare workers who position patients for imaging but do not always wear dosimetry badges are a commonly overlooked group.

In industry, radiation is used routinely for non-destructive testing - inspecting welds, pipework, and structural components using X-ray or gamma-ray sources. Radiographers working in oil refineries, shipyards, construction sites, and manufacturing plants carry portable gamma sources and work in environments where other tradespeople may be nearby. Industrial radiographers consistently record among the highest individual occupational doses outside the nuclear sector.

Mining exposes workers to naturally occurring radioactive materials. Underground miners in uranium extraction face direct source exposure, but workers in phosphate, tin, and rare earth mineral operations are also exposed through dust inhalation and radon gas accumulation. Radon - a naturally occurring radioactive gas produced by uranium decay in rock - is also a recognised hazard in certain above-ground workplaces including basements, tunnels, and poorly ventilated ground-floor spaces in geologically active areas.

Cabin crew and frequent long-haul pilots are exposed to elevated cosmic radiation at cruising altitude, an exposure most in that sector remain unaware of. Over a career of many flight hours, accumulated doses become occupationally significant.

Early and Later Signs: What to Watch For in Yourself or a Colleague

Chronic low-level exposure produces no immediate symptoms. This is the central danger. A worker accumulating occupationally significant doses year after year will feel nothing unusual - no pain, no visible change, no warning sensation. The harm is statistical: it raises the probability of cancer over a lifetime, particularly leukaemia, thyroid cancer, lung cancer (especially combined with radon exposure), and cancers of the skin and eye lens.

The eye lens is an under-recognised target organ. Cataracts caused by occupational radiation exposure can develop over years and are now known to occur at lower cumulative doses than previously believed. Interventional radiologists and cardiology nurses who work without adequate eye protection are at meaningful risk of radiation-induced lens opacities that impair vision in later working life.

Acute high-dose exposure produces a different, more recognisable picture: nausea and vomiting within hours, skin redness similar to severe sunburn, hair loss, fatigue, and - in serious cases - a drop in white blood cell and platelet counts that leaves the person vulnerable to infection and bleeding. These signs appear when safety systems have failed badly, and they constitute a medical emergency.

Workers should pay attention to any unusual clustering of illness among colleagues in a radiation-exposed team, unexplained fatigue, or skin changes on consistently exposed areas such as the hands. These are rarely radiation effects alone, but they warrant proper investigation.

What Employers Are Required to Do

Under occupational health regulations in most jurisdictions, employers who use or are exposed to ionising radiation have a hierarchy of formal duties that go well beyond simply posting warning signs. These duties apply whether the source is a medical X-ray machine, an industrial gamma projector, or a radon-emitting geological environment.

The primary duty is to conduct a radiation risk assessment before work begins - and to review it whenever the work changes. This assessment must identify who is exposed, in what tasks, at what likely doses, and what controls are in place. Where the assessment shows that exposure cannot be reduced to trivial levels through engineering alone, workers must be formally classified as either supervised workers or radiation workers, with corresponding monitoring and health surveillance requirements.

Employers must appoint a competent person - sometimes called a radiation protection adviser or supervisor depending on the jurisdiction - to oversee the radiation protection programme. This is not a paper role: it involves reviewing dosimetry records, investigating anomalies, and ensuring that equipment is maintained, calibrated, and used correctly.

Personal dosimetry is mandatory for classified workers. Dosimeters measure individual exposure over a defined period - typically monthly or quarterly - and the records must be retained for the duration of the working life and for a defined period beyond it, because radiation-induced cancers may appear decades after exposure. Employers who lose or fail to maintain dosimetry records cannot demonstrate compliance and cannot protect the long-term interests of their workers.

Health surveillance for radiation workers typically includes pre-placement assessment to confirm fitness, periodic review, and arrangements for investigation if dose limits are approached or exceeded. Surveillance records are confidential but must be available to the worker on request.

Practical Controls That Work - and Ones That Do Not

The three pillars of radiation protection are time, distance, and shielding. They are not equally powerful in every situation, and the most effective approach combines all three. Reducing the time a worker spends near a source, increasing the distance between the worker and the source, and placing shielding material between the two are the physical controls that actually reduce dose. Proper shielding design - lead aprons in radiology, concrete walls in radiography bays, distance rules around industrial sources - prevents exposure before it occurs.

Personal protective equipment such as lead aprons, thyroid collars, and leaded glasses protect effectively against scattered radiation in medical settings, but they are not substitutes for engineering controls and they do not protect against primary beams. A lead apron worn in an improperly shielded room does not make that room safe. Eye protection is consistently under-used in interventional settings and consistently effective where it is worn correctly.

Administrative controls - limiting who enters a controlled area, using warning systems and interlocks, establishing written local rules, and ensuring proper training - are necessary but weak when they stand alone. They depend on consistent human behaviour, which is the least reliable element in any safety system. A controlled area that can be entered without bypassing a physical barrier will eventually be entered at the wrong time.

What does not work is informal practice: the radiographer who allows unlicensed staff near the source because the procedure is 'quick', the nurse who consistently leaves the room without checking the scatter level, the mine manager who never measures radon because it 'has always been fine'. These behaviours are precisely where preventable occupational exposure accumulates.

What a Worker Should Do If Already Affected

Any worker who believes they have received an unexpectedly high dose - from equipment malfunction, a source left unshielded, or a procedure that ran significantly longer than planned - should report it immediately and request a dose assessment. This is not an overreaction. Dose records exist to investigate exactly these events, and early review allows the employer to correct what went wrong before others are affected.

A worker who develops symptoms consistent with acute exposure - nausea, skin redness, unusual fatigue, or hair changes - requires urgent medical evaluation. These symptoms are not specific to radiation and have many other causes, but in a worker with known exposure they must be taken seriously and investigated with blood tests as a minimum.

For workers concerned about long-term exposure, the most important step is to ensure that dosimetry records are complete and accurate. Workers have the right to see their own dose records in most occupational health frameworks. If records are missing, incomplete, or have never been provided, this should be raised formally with the employer and, if necessary, with the relevant regulatory body.

How Health at Work Supports Employers and Workers in Radiation-Exposed Settings

Health at Work provides occupational health services designed for workforces where radiation exposure is a genuine, managed hazard rather than a theoretical one. Services include pre-placement and periodic health surveillance for radiation workers, review and interpretation of dosimetry trends, fitness-to-work assessment, and support for employers building or reviewing their radiation protection programmes. The focus is always on what is measurable, what is actionable, and what protects the individual worker across a full working life - not just in the week that the inspection happens to fall.

Radiation protection is not a specialist niche. It is a fundamental occupational health duty in every sector where sources are used, and getting it right requires the same disciplined, evidence-based approach as any other serious workplace hazard.