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Ionactive Consulting Blog

12/12/2013 - Overxposure of an industrial radiographer

This is taken from the IAEA News Channel (Nuclear & Radiological Events)

Overexposure of an Industrial Radiographer.

 

[14 September 2013, Germany, Lingen Refinery, posted 18 November 2013, INES = 3(Final)]

On September 14, 2013, a person was exposed to high radiation in a refinery in Lower Saxony. This person is an employee of a company for non-destructive material testing based in Rhineland-Palatinate, which operates nationwide.

The evaluation of the employee's official dosimeter showed a radiation exposure of about four times the statutory annual dose limit for occupationally exposed persons. The affected employee had a whole body exposure of 75 mSv (statutory annual dose limit for occupationally exposed workers is 20 mSv).

In addition on the left hand considerable skin redness and burns have occurred. These are signs of exceeding threshold limit for hand and skin at least for a factor 10. According to estimates a skin dose of 10 - 30 Sv (statutory limit 0.5 Sv) is probably.

According to the current state of knowledge, there was a defect in the used gamma radiography device (Ir-192, 740 GBq). There was an offence against basic safety rules during fixing the defect. Furthermore, there were significant delays in reporting the incident to the relevant authorities and the medical care of the employee.


The incident log for the above event can be read at the following link: IAEA News Channel.

Ionactive Comment

Yet another industrial radiography accident. This time in Germany.

1/5/2013 - Overexposure of a worker (I-131)

This is taken from the IAEA News Channel (Nuclear & Radiological Events)

Overexposure of a worker (I-131)

 

[28 February 2013, Finland, MAP Medical Technologies Oy, posted 08 April 2013, INES = 2(Final)]

A laboratory worker was contaminated with I-131 in a radiopharmaceutical company on February 28 2013. The worker was wearing two pairs of gloves and, when changing gloves, had noticed a break in the right inner glove, but not any obvious break in the outer latex glove.

Only 3-4 hours later, routine monitoring revealed heavy contamination of the dorsal part of the right hand. Immediate actions to decontaminate the hand were undertaken on site. On the next day, besides persisting heavy contami-nation of the hand, activity was also found in the thyroid gland, and the Finnish Radiation and Nuclear Safety Authority (STUK) was notified. Stable iodine had not been administered.

Based on original measurements on site and later follow-up at STUK, including surface contamination measurements and whole body counting, the original activity of the hand was estimated at 11 MBq and the equivalent skin dose at 25 Sv, affecting an area of about 10 cm2. The estimated equivalent dose to the thyroid was 430 mGy and the estimated effective dose 22 mSv.

On her first visit at STUK, the worker was advised to wear a glove and change it frequently in order to protect the surrounding and promote decontamination by sweating and washing. Three days later little activity was left in the hand. 11 days after the incident the skin was dry and slightly desquamating. After 15 days the skin was intact with no desquamation left. No further signs of skin damage have occurred.


The incident log for the above event can be read at the following link: IAEA News Channel.

Ionactive Comment

I think this is quite a shocking case. Just look at the headline figures here: 25 Sv to part of the hand, dose to the thyroid 430 mGy and effective whole body dose estimated at 22mSv. (Personally I think the units used are a little wonky, but I will put that aside).

It is very important to note that this is not a nuclear incident (even though it's reported on the IAEA news event channel). This is very unlikely to hit the media - will be missed by most - but the doses received in this incident ARE NOT common in the nuclear industry (far from it) - under routine or accident situations to workers or members of the public.

According to their website, Map Medical Technologies develop and manufacture radiopharmaceutical for nuclear medicine professionals. There are many similar companies like this located all over the world doing similar work. Looking at the report of this case it makes me wonder how many similar exposures of this type might go undetected. There appears to have been a PPE (double glove) failure, combined with a lack of monitoring so that the hand contamination went unnoticed (for up to four hours). It is not clear if the thyroid contamination is a result of transfer from the hand, or due to direct intake at the workplace (during the initial contamination incident). I am inclined to think that latter - clearly radiological hygiene standards were considerably below expectations.

A lack of radiation  / contamination monitoring (again)

If you look at other incidents I have commented on in this blog, many being very different to this latest one, you will nevertheless see a common theme. Lack of monitoring. I spend considerable time during my training courses - drilling into delegates the fact that monitoring (passive, active, direct and in-direct) are the ‘eyes, ears - indeed all the senses combined' -and the only way to understand the radiological environment surrounding you. Without adequate monitoring you are effectively ‘blind' - and when blind significant radiation exposures can be delivered leading to events of this type.

Is 25 Sv local dose really possible?

I was curious to see if the estimated dose delivered to the hand was realistic (since 25 Sv is a massive localised dose, and 11MBq is a modest activity used in the medical sector). I ran my Varskin 3 code (a dosimetry model for surface / skin contamination). I used a skin density thickness of 7 mg / cm2, a 2-d disk (10 cm2), skin averaging over 10cm2, 11 MBq of I-131 with an exposure time of 4 hours. My results were around 8 Sv (Gy) which is about a 1/3 reported above. I re-ran the code with different geometry and skin thickness and you can approach 25 Sv (Gy) so I presume the dose calculations run for this individual would have been very specific. So the basic findings are that a localised radiation dose of 25 Sv is most certainly possible under the conditions outlined in this incident.

Wearing gloves

I then wanted to explore using gloves. I have no idea what type of gloves were worn so I used neoprene gloves with the following specification: density 1.23 g/cm3 with the thickness of 0.4mm. Assuming these gloves were worn intact with the contamination on the outer surface, then the skin dose over four hours is reduced by about a factor 8. With two pairs of gloves the dose to the skin over the exposure time reduces by a factor of about 50 (so using the original supplied data you might be looking at a hand dose of 0.5 Sv rather than 25) - still considerable, but considerably less.

The results of the calculations show that regular monitoring of the gloves during the work is a key measure to reducing exposures.

25/2/2013 - Overexposure of Workers (Ir-192)

This is taken from the IAEA News Channel (Nuclear & Radiological Events)

Overexposure of workers (Ir-192)

 

[18 October 2012, Pakistan, Wajedo International, Karachi, posted 10 January 2013, INES = 3(Prov)]

On October 18, 2012, three workers were overexposed during industrial radiography at Phool Nagar near Lahore. The event took place due to detachment of Ir-192 source (67 Ci) which remained stuck in the Guide Tube. The workers could not notice this and loaded the Gamma Projector and Guide Tube in the vehicle and traveled for almost 30 minutes from work site to office while placing the Guide Tube very close to the leg of one worker (‘worker A' sitting on rear seat of the vehicle).

After reaching the office, ‘worker A' unloaded the Gamma Projector to place it in storage pit. ‘Worker B' performed radiation survey and found that the source was still in the Guide Tube. ‘Worker B' and ‘worker C' (‘worker C' was not a designated radiation worker) conducted the recovery operation and brought the source to shielded position.

‘Worker A' reported headache and vomiting within 24 hours and severe burns appeared on his left leg in about 15 days which later developed into open wounds. ‘Worker A' is currently under medical treatment.

The event came into the knowledge of Pakistan Nuclear Regulatory Authority (PNRA) by the end of November 2012. The matter was investigated and investigations found certain violations of regulatory requirements and certain steps of safety procedures. PNRA has served work stoppage notice to the company and further actions are under way.

Calculations were made to assess the dose received by the workers. The whole body dose to the ‘worker A' sitting near to the source in the vehicle is estimated to be 2.02 Sv and for the other two workers sitting at front seats of the vehicle is 0.81 Sv each.


The incident log for the above event can be read at the following link: IAEA News Channel.

Ionactive Comment

Yes another sad case of bad practice in industrial radiography. It does not report the local dose to the leg, it would have been significant.

29/11/2012 - Abu Dhabi (UAE) Radiation Protection Training (Part 3)

So I come to part 3 of this little blog session on my trip to Abu Dhabi (UAE). Ionactive has for many years run very successful Radiation Protection Supervisor (RPS) training in the UK. Whilst there are many things I have not yet achieved in life, and I am on a constant learning curve, the one thing I can do well is ‘train’. Radiation is not ‘tangible’ and therefore getting the subject matter over to the delegates in an understandable and memorable way is the challenge. In addition, dispelling a myth that radiation is a ‘black art’ (actively encouraged by some) is always an important training objective. Therefore the opportunity to take the Ionactive training approach abroad is most welcome.

RNA Safety International

Our host and course organiser in UAE is RNA Safety International – a leading safety training consultancy in the region.   It has been a real pleasure working with them on this occasion and I look forward to many more sessions in the region during 2013.

Radiation Protection Officer (RPO) Course

The course running in UAE was a Radiation Protection Officer (RPO) course over three full days. The course is specifically designed for the region and is entirely compatible with the requirements of UAE Federal Authority for Nuclear Regulation (FANR). Full course details and general information on Ionactive international training services can be found on our International Radiation Safety Training page.

Ionactive (Mark Ramsay) training in UAE

So here I present a few pics of the training that for some reason I like!

First off is a general view of the training session from the perspective of the delegates (an ‘action shot’). The training venue was a pleasure to work in.

Ionactive - RPO Training in Abu Dhabi (UAE)

I like to get the delegates to understand numbers – both big and small. You cannot avoid this when discussing radiation protection!

Ionactive UAE Training - Know your numbers!

My wife, having seen some of these pictures, likens my style to the ‘overblown antics of Robbie Williams’. I am not really sure how to take that (!), but I suppose I am very animated when training – here is a (not very flattering) example of me explaining the relative size of an atom.

Ionactive Training UAE - know the size of the atom!

As you see in the next pic I can do ‘very big’ as well as very small. I am not really sure what I was discussing at this point – maybe you can suggest a caption?!

Ionactive Training in Abu Dhabi (UAE) - It is THIS BIG !

What I really do enjoy is the interaction with delegates outside the main training sessions. This is the time where specific questions can be asked.

Ionactive RPO Training UAE - A happy delegate - A good training session!

Those questions and discussions extend to the coffee sessions. In some ways this is the most important picture / memory of the training session. A measure of the keenness of the delegates, and my ability to make the training interesting and relevant, is the extent to which they wish to carryon discussions during the breaks. We had plenty of coffee breaks discussions – partly the reason why the entire trip was so tiring (but so successful too).

Ionactive RPO Training Abu Dhabi (UAE) - Coffee break discussions are good!

28/11/2012 - Abu Dhabi (UAE) Radiation Protection Training (Part 2)

I just thought I would upload part 2 of this three part blog series regarding the recent radiation protection training trip to Abu Dhabi. Of course, the most important part of the trip is the training – running a Radiation Protection Officer (RPO) session over 3 days. However, every trip is a learning experience in other ways – culture, architecture and of course food. So I now present a few pictures of my time in UAE relating specifically to observations away from the training.

Grand Millennium Al Wahda Abu Dhabi

I stayed at the Grand Millennium Al Wahda hotel in Abu Dhabi. I requested this from the client specifically – partly so I was not staying at the training venue (held at the Le Méridien Abu Dhabi). At the end of a long day training it is nice to get outside and travel somewhere else to stay rather than simply ‘go up to your room’. Secondly, due to my work being all over the place (re the chaos at home over last few weeks), I wanted somewhere I could quietly knuckle down and get some work done. Therefore it allowed emails, reports and finances to be conducted without feeling I should be spending the evening with delegates.

It was a nice hotel – very nice staff and with a fantastic restaurant called Toshi.  Those who have followed my trips to Dubai will know I also rave about Toshi in Dubai. Toshi is an Asian themed place serving freshly prepared and cooked food from Japan, Thailand, China and related areas.

Ionactive at Grand Millennium Al Wahda Abu Dhabi

Ionactive - inside the Grand Mellennium in Abu Dhabi

Oh the traffic !!

The journey between the Grand Millennium and the training venue took about 30 minutes. What I noticed immediately is that rush hour in Abu Dhabi is no different to any other large city in the UK. I did find the U-turns performed at major intersections / traffic lights rather alarming (I just closed my eyes and hoped!).

Ionactive in Abu Dhabi traffic - rush hour!

The Toshi Restaurant

So to the food. As many of you will know I rather like my food. I have been on a campaign to lose weight since the 1/1/2012 eating nothing but Asian related foods (mostly cooked by myself).  As of 28 November I am hovering around 22.5 kg reduction – not really getting rid of any more at the moment – rather I am maintaining. The main thing I have learnt is that you can cook exciting foods – controlling the sugar and oil is the key to controlling the healthy (or not so healthy) dish. If someone is going to cook for me I like to know what is going into the dish. What I like about Toshi is that much of the food is Japanese style (sushi, raw fish related) and you can pick and choose so you know what you are getting. Most of the cooked dishes are prepared in front of you so that you can see what is going in, and in my fussy case, control that oil!

Here is an example of the stir-fry which was cooked for me on the night of my arrival. Being tired I did not want to eat much so just grabbed a basket, picked all the ingredients,  and gave to the chef to cook right there are then. Was fabulous (and note the chilli!).

Ionactive - first night meal at Toshi - healthy stuff!

Another night I wanted a curry so opted for duck curry with vegetables. Not quite as healthy I know (!) – but I made up for it by avoiding the rice. It was fabulously aromatic and not too hot – normally I do go for heat but the delicate spicing enhanced the tender duck meat.

A duck curry at Toshi - very good indeed!

On my last night in UAE I opted almost exclusively for Sushi – making up the dishes from scratch and going for raw fish, no rice and plenty of salad. I have never really been into Sushi but I must say it was fresh and felt very healthy to eat! So, with that in mind I was not at all guilty (much) to have just one pudding during my stay. Now take a close look at what follows – black pepper ice-cream in a crispy basket with ‘things’.  No idea what has gone into this dish but it tasted fantastic!

One for the road, or air - Black Pepper Icecream!

So that ends part 2 of this blog about UAE. Not much radiation protection I know, I will discuss the RPO course during the final part 3 – coming up soon!

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About Our Blog

This is the company blog of Ionactive Consulting Limited, a Radiation Protection Adviser consultancy. Visit here often to read our views on radiation protection and related matters. You can contact our director and RPA directly at mark.ramsay@ionactive.co.uk

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