Radiation Products
STS Dual-FH40G Meter
Simulated Contamination & Survey Meter
The STS Dual FH40G simulator is unique to the STS range offering users the ability to use either the internal simulated radiation detector, a radiation probe such as the FHZ512 or a contamination pancake probe such as the FHZ732. The unit developed by STS utilises both the STS Safe-Series technology to safely replicate radiation fields and also STS's proprietary gas sensing technology for the simulation of contamination on surfaces.
Radiation Survey Mode:
A radiofrequency source, such as those shown, is placed in the training area and the simulated unit activated, the instrument then functions exactly as the real instrument does but is detecting the radio field not ionising radiation. The simulators are able to replicate characteristic shielding and approximation to the inverse square law providing a very realistic training platform. Attenuation of materials may be shown by placing the meter behind various shields such as plaster board, wood & glass. The thickness and density of the material will vary the signal received and demonstrate the value of using shielding to protect the worker.
The unit has an internal simulated detector which responds to the source and outputs the readings in uSv/hr - an artifical background may be selected and adjusted from the menu.
The Rate alarm threshold may also be set from the menu. The telepole detector head (FHZ512) has detectors mounted inside giving an approximate 360 degrees of
coverage. When connected the FH40G will display EXT to indicate that readings dsiplayed are now from the external probe and not the internal detector.
The STS Safe- miniature source is particularly good for use with the extended telepole as it may be hidden easily out of sight. STS can supply either a probe for
telepole mounting or one for use by hand on a 1.5m cable.
Contamination Mode:
The FH40G Dual meter can have a simulated contamination probe attached by way of a 4pin connector. STS have developed a simulated version
of the Thermo FHZ732 pancake probe specifically for this meter. The probe detects the gas given off by the STS LS1 simulant, which has been
applied to the surface to be monitored. The readings when the unit is switched into Contamination Mode are displayed in CPS.
This “radiation” may be detected by passing the probe close to and slowly over the surface, as would be done with a real probe when
used by a skilled operator. Too fast, or too far away results in no detection – excellent training!
Cross contamination can easily be demonstrated, as can decontamination – both benefits of using a “real” contamination, even if not
radioactive. The contamination lasts at room temperature for 1-2 hours but totally evaporates within 24hrs leaving the training area ready for
the next exercise.
The FH40 controls and characteristics remain unchanged from the real instrument, button function is identical and the instrument has selectable
alarm functions and audio output. The simulator is built into a slightly deeper case than a standard FH40 and incorporates a built in Lithium-Ion battery which provides over 10 hours run time between charges. The use of simulators also helps to limit 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.
