PART NUMBER: 48-2973
Detector Specifications
DETECTOR: Boron trifluoride (3BF)
proportional tube.
ENERGY RANGE: Thermal to approximately
12 MeV.
MODERATOR: 9" (22.9 cm) diameter cadmium-loaded
polyethylene sphere.
SENSITIVITY: Typically 30 cpm per mrem/hr (241AmBe
fast neutrons); 100 cpm per mrem/hr (moderated 252Cf).
GAMMA REJECTION:
Typically 10 cpm or less through 10 R/hr (100 mSv/h) (137Cs).
ENERGY
RESPONSE: Thermal to 7 MeV follows the radiation
protection guide curve for neutron dose.
SIZE:
10.25" H × 9" W × 9" D (26 x 22.9 x 22.9 cm), including brackets.
WEIGHT: 14.42 lbs. (6.54 kg)
Ratemeter/Scaler
Specifications
DISPLAY: A four-digit Liquid Crystal
Display (LCD) with digits one half inch in height. Two additional 0.2" (0.5 cm)
digits are used for the overflow counter (scaler mode) and exponential powers
(parameter setup). Enunciators are provided for display units, alert, alarm, low
battery, detector overload, counting overflow, and scaler counting.
LIGHT:
Display backlight activated by push-button.
RATEMETER:
Depending upon how the instrument was calibrated, the ratemeter can display in
either R/hr, Sv/hr, cpm or cps when the control switch is in the ratemeter
position.
SCALER:
Activated by push-button in handle when the three-position switch is in the
scaler position. Count time is adjustable.
RESET:
A pushbutton for zeroing the display, acknowledging and/or resetting the alarm.
AUDIO:
Built-in audio speaker (unimorph) with aud on/off switch; greater than 60 dB at
2 feet.
RATEMETER ALERT/ALARM:
Indicated by either an alert or alarm enunciator on the
display and by an audible tone. Set at any point corresponding to the
pre-selected ratemeter range.
SCALER ALARM:
Adjustable from 1 to 999999 counts.
TIME BASE:
Can display in seconds or minutes.
AUDIO DIVIDE:
1, 10, 100 or 1000 events-per-click.
RESPONSE TIME:
Variable or fixed ratemeter response (All stated times correspond to a range of
10% to 90% of the final reading). Factory default is ˝variable˝ so that the
instrument will automatically adjust the response time to the best setting for
the current count rate.
VARIABLE RESPONSE:
Dependant on the number of counts present. Typically 4 to 25 seconds for fast,
and 4 to 60 seconds for slow.
FIXED RESPONSE:
The fast response position is adjustable from approximately 2 to 50 seconds. The
slow response position is approximately 5 times slower than the fast. For MDA-type
measurements, the fixed response mode is recommended.
SIZE:
6.5" H × 3.5" W × 8.5" L (16.5 x 8.9 x 21.6 cm)
WEIGHT:
3.5 lbs (1.6 kg) including batteries
Ludlum Medical Physics Model 2241-4
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