Radiation and its Risks (with extracts taken from HSE)
Failing to detect radiation contaminated scrap, can have hidden costs as well as affecting the health and safety of your workforce
Radiation cannot be detected by human sense: it cannot be seen, smelt or felt, but it can damage human tissue and organs, sometimes fatally. Protection by identification is key to remaining safe and following some simple guidelines, as set out by HSE (and your company policy) once a source has been identified and located. It should be normal practice to monitor your product both on entry and exit from the premises.
What is Radiation?
We are all constantly exposed to natural and man-made radiation, which is collectively known as background radiation. This can vary with a number of factors, such as:
All material is made of atoms, which are usually safe and stable. Radiation is caused by the nuclei of unstable atoms, emitting energy in order to become stable. This energy can be emitted as fast moving particles or as waves (rays). There are different types of energy that can be emitted: alpha particles, beta particles, and gamma rays. Sometimes neutron rays and X rays will be emitted.
Each type of radiation has a different amount of energy, will travel different distances and be stopped from travelling by different materials.
What sources of Radiation are there?
There have been many incidents worldwide including in the UK, where radioactive materials have become incorporated into the scrap metal chain. The radioactive material tends to originate from the following sources:
Sealed radioactive sources are usually housed in an outer casing or container which acts as a shield to the radiation. 'Orphan' sealed sources from redundant industrial plant can present an immediate hazard in the scrap yard if this shielding is missing or damaged on initial receipt. They may present little risk if the container is properly closed and locked.
When scrap is processed and sorted by fragmenting, shearing, milling, cutting, etc, there is a potential for loss of shielding and subsequent significant exposure of employees to external radiation. Loose radioactive material can then contaminate large areas of processing plant including scrap yards with significant potential for exposure of operatives to internal radiation by ingestion or inhalation. If a source is ruptured during smelting, the linings of furnaces, slag- handling facilities, bag houses and the actual product can all become contaminated. Shutdown and decontamination of plant can be very expensive and time consuming.
You can see a range of examples of sources in the RadComm presentation.
Radiation and Risk
The risks associated with radioactive sources are dependent on a variety of factors:
You can protect yourself by using three principles:
Your Primary Source
For Radiation Detection
RadComm: The Future of Radiation Detection Technology