RADIATION PARC SYSTEM

If a very small controlled area is required so that others can work in the same location CET Medway Ltd can utilise the PARC System (Portable Apparatus for Radiation Control) we can bring the Controlled area down to 2 m Radius with a 15 curie Selenium 75 source. The production is reduced using this system.

If it is necessary not to stop your men working on days or nights we could utilise our PARC system, to carry out radiography while your men are working in the area.

The system uses a Selenium 75 source which is very easy to shield because its half value layer thickness of lead is 1.1mm instead of 5.5mm that of Iridium 192.

PARC system showing configuration for radiographing small bore . Clamp is fitted on  the pipe and  moved around  the butt weld  shooting  the  required  number of shots as  required by the  thickness and specification. There is  no radiation  omitted out  of the sides  due  to  the  effective  collimation. The gamma block placed on the back  of the  pipe and  supported by the clamp to ensure  there  is no  scattered  radiation from the beam

The system does not use a Source projection tube, so there is no high radiation level as the source leaves the container and travels to the collimator. The tungsten collimator is attached to the container to overcome this problem and improve safety; extra shielding can be used on the pipe to keep the radiation level as low as reasonably practical.

The PARC system is similar to other systems that are currently being used in the market place and the HSE are recommending their usage where possible to reduce radiation levels to current radiation workers.

The current rules regarding radiography require us to work strictly to the requirements of, The Ionising Regulations 1999 .

Maximum permissible Radiation Dose Limit Non Radiation Workers = 2.5uSv
Maximum permissible Radiation Dose Limit Radiation Worker= 7.5uSv

Our System of work for your area will involve a taped physical barrier approximately 3 metres away from any Non radiation worker, the area will always have two classified workers within the boundary which will act as a further safety check

PARC  system showing configuration for the radiography of large bore pipe work PARC system is fitted on the pipe and  moved  around  the  butt  weld shooting the required number of  shots  as  determined  by  the  thickness  and specification.   There  is  no  radiation  omitted  out  of the sides due to the effective collimation.     The gamma block placed  on  the  back  of  the  pipe  and  supported by the clamp  to  ensure  there  is  no scattered  radiation for the beam.    The radiation omitted through the pipe is reduced to  a  safe limit due to the effective half value layer of the gamma block

The Radiation energy is a lot lower than Iridium 192 and therefore produces a better quality radiograph. It conforms to the new EN1435 Radiography standard for the radiography of welds of thickness from 5 - 20 mm penetrated thickness.

The main differences between the PARC system and the conventional system are listed below:

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