Study reveals UK exposure to dental X-rays
 

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Study reveals UK exposure to dental X-rays

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Study reveals UK exposure to dental X-rays

 

Study reveals UK exposure to dental X-rays

Greater use of X-rays over the last 10 years, including a 140% increase in CT examinations, has raised the annual radiation dose the UK public receives, new research reveals.
 
Radiation scientists at the Health Protection Agency (HPA) have estimated that about 46 million medical and dental X-ray examinations were carried out across the UK in 2008, an increase of 10 per cent since 1997.

About two-thirds, 67%, of the procedures were carried out in NHS hospitals while 26% were performed by dentists.
 
The new HPA study reveals that the average annual radiation dose to each member of the public from all diagnostic X-rays has increased from 0.33 millisieverts (mSv) in 1997, the last time a detailed frequency survey was completed, to 0.4 mSv.

Most of the increase is due to the growth in the numberof higher dose CT examinations.

Medical X-rays remain the largest single artificial source of radiation exposure for the UK population.

The average radiation dose from all sources of ionising radiation remains about 2.7mSv per person year and medical x-rays contribute 15% of this total.
 
Dr John Cooper, director of the HPA's Centre for Radiation, Chemical and Environmental Hazards, said: 'Despite the increased use of diagnostic X-rays in medicine in the UK, the average dose to the population is still considerably lower than in comparable countries. This is because in the UK we carry out fewer X-ray examinations per head of population and because radiology departments are well managed by healthcare professionals.

'Well framed regulations and guidance exist to maximise the clinical benefit and protect the public and workers. It is worth noting that internationally our average annual diagnostic X-ray dose is low. In the USA, for example, people are exposed to five times more radiation from these procedures every year.'
 
The survey also reveals that:
• CT scanning now accounts for around 68% of the dose to the UK public from all X-ray procedures. About 1.4 million CT scans were performed in 1997 and 3.4 million in 2008 – a rise of 140%. Around 20,000 of these CT scans were performed on asymptomatic individuals as part of self-initiated health assessment.
• Dentists in the NHS and private practice carried out about 12 million diagnostic X-ray examinations in 2008, although their contribution to the UK radiation dose remains negligible since they are low dose procedures.
• About 1.2 million X-ray examinations were taken in independent hospitals in 2008, a rise of 40% since 1997.

Dr Cooper adds: 'Medical radiology is by far the largest man made source of exposure to ionising radiation – which makes it a key area when it comes to radiation protection and identifying the areas where effort should be made to reduce unnecessary radiation doses to the public.
 
'This report highlights the steady rise over the past 30 years in the frequency of X-ray examinations in the UK and the resulting increasing average dose to the population, relative to a slower rise in the size of the population.

'We have previously drawn attention to the expanding use of CT scanning as an increasingly important source of exposure to ionising radiation for the UK public, often replacing conventional X-ray examinations. This report confirms that trend. It is essential that we keep monitoring radiology practice in this way in support of patient safety.'

 Posted on : Tue 4th - Jan - 2011

 

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