Simulated Contamination

Simulated Contamination

How it works


STS  Ionising Radiation Contamination SIMULATORS

STS specialises in the conversion of standard instruments for training purposes. A range of instruments including the Rotem Ram Gene, Ludlum 3,12 and 14, Thermo Electra and CM11and others are all available  designed to replicate the response and characteristics of the real instruments.

Watch these videos of how the Radiation Contamination Simulation works  & videos were produced by our US Distributors -Radiation Safety Control Services.


This technology consists of two parts, simulated contamination and a modified instrument to detect it. The simulated contamination is a safe liquid - STS LS1 - which can be applied to clothing, equipment, plant and surfaces where it slowly evaporates. Because the gas is very dense, the gas cloud stays near to the surface.


This simulation system is used to train staff in monitoring general radioactive contamination, or, in specific sites, Alpha contamination.
The gas cloud stays within about 2 cm of the surface, and within this range, the signal will range from over 2000cps at almost contact to background at 2 cm. To force the trainee to develop good monitoring technique, the system is regulated so that if the monitor is passed too quickly over the surface or is too far away, little gas is captured. Hence the trainee learns to monitor with the probe close to the surface and travelling slowly.

The period when the LS1 is generating sufficient gas to enable the simulation to operate is dependant on length of time, temperature and roughness of the surface. For example, on a cold concrete floor, the LS1 may remain for several hours, while on a warm, rough cloth sleeve the liquid will be have evaporated in less than 1 hour.

In any case, the source will have completely evaporated in 24 hours, allowing a new session to be undertaken without a ‘hangover’ from the previous training session.

Because the liquid is sticky it is easy to demonstrate transfer of contamination – brushing a hand over a contaminated surface will result in the hand becoming contaminated and then everything touched is also likely become ontaminated.
Decontamination by wiping or washing will allow clean-up procedures to be undertaken.

For some applications a solid contaminant may be required and STS produce the SS4 powder stimulant for this purpose.

STS Simulators are able to replicate the characteristics of contamination from radioactive sources
including cross contamination where clothing, skin or environmental contamination may occur; this is not possible to achieve with a real source scenario without undue exposure to the trainee.

Limiting the exposure of the trainer – if real sources are used, every training session poses an additional cumulative dose to the trainer, while the trainee receives only the dose resulting from the session attended.

Training with real radiation sources requires a considerable amount of paperwork to move sources, even very small ones, from secure areas to “open field” exercise areas taking time which could be more productively used.
STS simulators solve these problems – the trainer has no cumulative exposure from each training session and the trainee can make serious mistakes without any hazard to anyone.

Good simulators allow training to progress from “no knowledge” to a full understanding of instrument controls, the relationship of source position, Instrument position and meter reading.

We welcome the opportunity to discuss individual requirements and tailored solutions.

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