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Ludlum Model
3-98
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Introduction |
● 125I
and Alpha, Beta, Gamma Radiation Survey Meter
● Alpha, Beta, Low-Energy Gamma Radiation Survey
● Internal GM Pancake Detector
● External 1 in. x 1 mm Low Energy NaI(Tl) Scintillation Detector
● 0 to 500 kcpm
The Ludlum Model 3-98 is uniquely configured to optimize measurements for 125I and also any alpha beta gamma radiation contamination. The dual detector design allows the user to select the detector of choice for the task at hand. The internally housed GM pancake detector can be used to read gammas. This detector's face can be exposed via a slide located along the bottom of the instrument thus making it sensitive to alpha's and beta's as well. The external NaI detector is optimized for low energy gamma's from 125I. The ratemeter is Ludlum's venerable Model 3-series which employs a robust aluminum cast instrument housing with a separate battery compartment for long lasting protection and long instrument life. The front panel controls include a rotary switch for selecting the 4 decade range, instrument shut off and battery test, an audio on/off switch, a fast/slow response switch, a count reset button and internal/external detector switch. The Model 3-98 is a complete turn key system and comes with the detector cable and two "D" cell batteries.
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Specifications |
PART NUMBER: 48-1135
INDICATED USE: alpha, beta, low energy gamma
radiation survey
RADIATION DETECTORS: controlled by selector switch
INTERNAL DETECTOR:
Type: pancake-style GM detector with 1.7 ±0.3 mg/cm² window
Area: active: 15 cm², open: 12 cm²
Efficiency(4π geometry): 5%–14C; 23%–90Sr/90Y; 19%–99Tc; 33%–32P; 15%–239Pu
Sensitivity: typically 3300 cpm/mR/hr (137Cs gamma)
Alpha-beta Shield: retractable 211 mg/cm² phenolic slide
EXTERNAL DETECTOR: Model 44-3
Type: low-energy gamma scintillator
Efficiency (4π geometry):
33.5%–125I (based on
129I efficiency of 18%)
Background (10 µR/hr):
< 350 cpm
Sensitivity:
675 cpm/μR/hr (125I)
Energy Range: recommended 5 keV–60 keV
CONNECTOR: Series "C" (others available)
METER DIAL: 0–5 kcpm, BAT TEST (others available )
MULTIPLIERS: x0.1, x1, x10, x100
LINEARITY: reading within ±10% of true value with detector connected
AUDIO: built-in unimorph speaker with ON/OFF switch, greater than 60 dB at 2 ft (0.6 m)
CALIBRATION CONTROLS: accessible from front of instrument (protective cover provided )
HIGH VOLTAGE: adjustable from 400–1500 volts
THRESHOLD: -30 mV ±10 mV
RESPONSE: toggle switch for FAST (4 s) or SLOW (22 s) from 10% to 90% of final reading
RESET: pushbutton to zero meter
POWER: 2 "D" cell batteries (housed in sealed compartment that is externally accessible )
BATTERY LIFE: typically 600 hours with alkaline batteries, battery condition can be checked on meter
METER: 2.5 in. (6.4 cm) arc, 1 mA analog type
CONSTRUCTION: cast and drawn aluminum with beige powder coat finish
TEMPERATURE RANGE: -4 to 122 °F (-20 to 50 °C)
SIZE: 9 x 3.5 x 8.5 in. (22.9 x 8.9 x 21.6 cm) (H x W x L), with handle
WEIGHT: 5.6 lb (2.5 kg) including batteries and detector
CE CERTIFIED: yes
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Options & Accessories |
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Technical Information |
Data
Sheet |
Product
Manual |
CE
Certificate |
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Ludlum Resources |