4.9. SETUP PAGE 4
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• Ones Place (0-9)
• Tens Place (0-9)
• Hundreds Place (0-9)
4.9 Setup Page 4
Beta Efficiency (Default 15.0%) -
A short press of the ON/OFF to select the value to adjust,
and MODE to adjust the value. Available values are:
• Ones Place (0-9)
• Tens Place (0-9)
• Hundreds Place (0-9)
• Number of Decimal Places (0 or 1)
Normally the efficiency is used on a per detector basis or 4pi basis, i.e. the efficiency of the
detector is calculated by dividing the count rate received from a source by the total disin-
tegration rate of the source. When either dpm or Bq units are chosen, the use of the 4pi
efficiency allows the display of the source size or activity on the Model 3002 display.
But if the user desires to have the Model 3002 show results in terms of dpm/100 cm2, the user
could manipulate the efficiency to produce this result by multiplying the efficiency times the
ratio of the detector area to 100 cm2. For example, using a detector with an area of 15 cm2,
if we start with 10% efficiency to measure in dpm, then the parameter could be changed to
1.5% to measure in dpm/100 cm2.
Or likewise for Bq/cm2, efficiency could be calculated as: efficiency = count rate/disintegration
rate*detector area (in cm2). For example, with the same detector as above with an area of 15
cm2, and starting with an efficiency value of 15%, then the parameter could be changed to
225% to measure in Bq/cm2.
Beta Pulser Threshold (Default 3.5 millivolts) -
A short press of ON/OFF to select the value
to adjust, and MODE to adjust the value. Available values are:
• Ones Place (0-9)
• Tens Place (0-9)
• Hundreds Place (0-9)
Beta Pulser Window (Default 30.0 millivolts) -
A short press of ON/OFF to select the value
to adjust, and MODE to adjust the value. Set this Value to 000 or 999 to disable. Available
values are:
December 2021
