LUDLUM 70, System Manual

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Model 70 System Manual
Ludlum Measurements Inc.
6
May 2021
power indicator LED will be illuminated. To power off the unit at any time and in any screen,
press and hold the ENTER button for more than 3 seconds.
USB connector – The USB connector is used to transfer recorded dose time chart, gamma-
spectra, and other data to and from a PC.
Dose – After power ON, the “ Dose” is activated automatically. The system
display will show the current dose rate in Sieverts per hour (Sv/hr) or Rem/hr, usually in
relevant radiation level scale like nano Sievert (nSv/hr), or micro Sievert (µSv/hr), µRem/hr, and
count rate in counts per second (cps) while the internal “audio meter” will give an audio
response.
Identify – by pressing the ENTER button shortly, the unit displays the second main screen with
nuclide ID function for a gamma-spectrum acquisition for a pre-set duration. As the spectrum is
being accumulated, it is displayed on the screen so the user can observe the spectrum as time
progresses. At the end of accumulation period,
Nuclide Identification is displayed on the
screen. The accumulated spectrum is then automatically stored with system name composed of
the date and time the spectrum was collected. All spectrums are stored for later analysis when
output to a PC.
To switch between the Search/Dose screen and the Identify screen at any time, press the
ENTER button shortly.
4. DETAILED OPERATION GUIDE
This section offers a detailed guide to system operation.
4.1 CONTROL BUTTONS
The Model 70 is equipped with three control buttons on the front face. These are the only
controls on the instrument.
START and CANCEL/SET – is used to scroll through menus displayed on the screen.
ENTER/SAVE
- is used to activate the selection highlighted on the display. Some operations
require a short press and some require a long press.
Short = less than 0.5 seconds
Long = 3 seconds
Power OFF – To power the unit OFF, press the ENTER button and hold for approximately three
seconds. The display shows the seconds counting down: “3, 2, 1.” After this the message,