Ludlum Medical Physics Model 14C/Model 44-9

  Radiation Survey Meter with Pancake Probe

Introduction

This general purpose, handheld analog ratemeter supports operating two separate radiation detectors. A switch on the front panel allows the user to select between the internally mounted GM detector for detecting gamma exposure over a range of 0 - 2000 mR/hr or the external Model 44-9 GM pancake detector.  The pancake detector is sensitive to alpha, beta and gamma and is the industry standard for detecting contamination.  This survey meter additionally supports externally connected scintillation detectors in lieu of GM’s.  The Model 14C can be used in a wide range of  Medical and Health Physics applications.  With the addition of the Model 180-2 sample holder,  it can be utilized to make a quick evaluation of wipe test surveys in the Nuclear Medicine department. 

Specifications

MODEL 14C RATEMETER

PART NUMBER: 48-1611
MULTIPLIERS: X0.1, X1, X10, X100, X1000
LINEARITY: Reading within ±10% of true value with detector connected
ENERGY RESPONSE: Within ± 15% of true value between 60 keV - 3 MeV (internal detector only)
CONNECTOR: Series “C” (others available)
AUDIO: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet)
HIGH VOLTAGE: 900 V (setting can be checked on meter); THRESHOLD: 30 mV ± 10 mV
RESPONSE: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
POWER: 2 each “D” cell batteries (housed in sealed compartment that is externally accessible)
BATTERY LIFE: Typically greater than 2000 hours with alkaline batteries
TEMPERATURE RANGE: -4°F to 122°F (-20° to 50° C)
SIZE: 6.5" H x 3.5" W x 8.5" L (16.5 x 8.9 x 21.6 cm)
WEIGHT: 3.5 lbs (1.6 kg) including batteries


MODEL 44-9 PANCAKE PROBE

PART NUMBER: 47-1539
WINDOW: 1.7 ± 0.3 mg/cm² mica
WINDOW AREA: Active - 15 cm²;  Open - 12 cm²
EFFICIENCY(2pi): Typically 5%-¹⁴C; 22%-⁹⁰Sr/⁹⁰Y; 19%-⁹⁹Tc; 32%-³²P; 15%-²³⁹Pu
SENSITIVITY: Typically 3300 cpm/mR/hr (¹³⁷Cs gamma)
ENERGY RESPONSE: Energy dependent
DEAD TIME: Typically 80 μs

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