Johnson Matthey Tracerco PED Blue, User Manual, Page: 8 / 25

MN1010 Rev. G 8 of 25
Status bar
Displays time, date and battery capacity. Alternates with PED status and warning messages, if any are
current.
Attention : For the PED+ and PED-ER+, the status icons for Bluetooth or GPS features are shown alternating with
the battery symbol if enabled.
2.2 Dose and dose rate measurement
PEDs measure and record the following:
Dose equivalent
Radiation equivalent dose Hp(10), accumulated in X-ray and gamma rays radiation in the energy range of
33keV to 3MeV (standard range) or 48keV to 3MeV (extended range), and is the equivalent dose at 10 mm
below surface of the upper body. Alarms can be set for dose.
Dose rate
Dose rates up 100 mSv/h (10 rem/h) or 1 Sv/h (100 rem/h) for the extended range. Alarms can be set for
dose rate.
Attention : The accuracy of measured dose rates cannot be guaranteed above 100 mSv/h (10 rem/h) or 1
Sv/h (100 rem/h) for the extended range. See the section Dose rate overload below.
2.3 Dose rate overload
PEDs operate accurately for dose rates up to 100 mSv/h (10 rem/h) or 1 Sv/h (100 rem/h) for the extended range.
The accuracy of measured dose rates cannot be guaranteed above the dose rate limit. Therefore, there is potential
for inaccuracies in subsequent accumulated dose values from the time of overload until the data has been cleared
and a new accumulation started.
During the dose rate overload, the top of the readings screen show
Overload
and dose rate is displayed as
>100mSv/h
or
>1 Sv/h
, or the equivalent in rem/h. The dose values are still displayed, but flash to indicate possible
inaccuracies. The status bar shows a warning symbol and the
Dose Error?
message. An alarm sounds
continuously until the button is pressed.
Attention : The actual measured dose rate values are still recorded and readable when transferred to
DoseVision™.
2.4 Alarms
PEDs have are two configurable dose rate alarms and up to four dose alarm levels. The alarm settings can be viewed
on the alarm levels screen. However, the alarm settings can only be changed with DoseVision™.
PEDs alert users to alarm conditions as follows:
Dose rate alarms
For dose rate alarms, the Dose rate LED flashes amber when the first alarm is reached and red for the
second alarm. The alarm continues until the dose rate drops below the alarm level.
Dose alarms
For dose alarms, the Dose LED flashes amber when the first two alarms are reached and red for the
higher two alarms. For the top dose alarm (red or dark red) the dose alarm LED stays on constantly. The
PED also makes a loud beeping noise as an audible alarm. The alarm continues until the total dose history
has bee
n transferred to DoseVision™.