The characteristic feature of the FH 41 P First Response is the use of sophisticated low power technology components and microprocessor-based, fully automatic self checks. No maintenance is required. The FH 41 P incorporates a highly sensitive NaI(Tl) scintillation detector with a miniature photo-multiplier allowing the detection of very low radiation levels.
NBR-BASED: An indication of radioactive material in the gamma energy range < 400 keV allows an immediate interpretation of a count rate increase.
MULTI-PURPOSE: The FH 41 P is designed to operate as both a survey meter and a dosimeter. Four operator modes can be selected:
1. a detection mode (cps)
2. level indication mode (9 log steps)
3. a dose rate mode in the measuring units Hx and H*(10)
4. a dosimeter mode
In the event of an alarm, the operator can change from the survey meter mode to the dose meter mode by simply pushing a single button.
SMALL SIZE: The FH 41 P was specifically designed to be as small as possible. This makes it very unobtrusive when used in public.
LOW POWER CONSUMPTION: Depending on the type of 9 volt battery used, the FH 41 P can operate up to 1600 h including internal data recording. The alarm is annunciated by chirping pulses.
RUGGED AND RELIABLE: The sealed metal housing incorporates a high sensitive radiation detector and is equipped with optimized low power technology. Several automatic self-checks are permanently active to test the performance of detector and the electronics. The unit can be worn in a belt holder.
SETTINGS AND DATA ANALYSIS: All factory-set parameters can be modified by hand or using an optional Windows™-based PC-software and accompanying reader device. In order to allow retrospective analysis of any event, the latest 1600 dose rate values are stored in the internal data memory. Each data point is averaged over a fix time interval which can be easily adjusted by the PC-software.
LOGBOOK: Changes in configuration, occurring alarms and errors are saved in FH 41 P. This saved events can be read out via the logbook option. It is shown as a table and can be saved to PC hard disc or printed. The logbook has a maximum of 250 data sets. Several events at the same time are saved as one record. At the display every event is shown in one line for better overview.
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