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Ludlum Model 2241-3RK

Radiation Emergency Response Kit

Introduction

● Ready-to-Go Radiation Emergency Response Kit

● Measures Alpha, Beta, Gamma Contamination
● Measures Radiation Rate, Convenient Detector Switching
● High-Sensitivity Gamma Probe for Quickly Finding Sources
● Auto-Ranging Digital Radiation Ratemeter/Scaler

● Convenient Detector Switching

The Ludlum Model 2241-3RK Radiation Emergency Response Kit packages all the basic radiation measurement tools you are likely to need to handle a radiological emergency into a convenient carrying case to facilitate a quick response when required. The kit includes Ludlum's digital, auto-ranging and versatile Model 2241-3 Ratemeter/Scaler. Responders can either plug in the Model 44-9 external alpha beta gamma radiation GM pancake detector for contamination measurements, the Model 44-2 high sensitivity gamma radiation scintillator for locating the source of the high readings or the Model 133-7 energy compensated GM detector for exposure rate measurements up to 100 R/hr. A convenient rotary switch located on the front panel permits the responder to select the appropriate operating parameter setup for the detector in use. The carrying case supplied with the kit is air and water tight with cutouts for each device including a ¹³⁷Cs radioactive check source to verify proper operation of the equipment.

Specifications

Ludlum Model 2241-3 Radiation Scaler/Ratemeter PART NUMBER: 48-3189

APPLICATION: radiation emergency response

RADIATION DETECTORS: see Model 44-9, Model 44-2, Model 133-7 for external detector specifications

CONTROL SWITCH: A 5 position rotating switch to allow for quick change between four detector setups

METER TYPE: digital ratemeter and scaler
DISPLAY: 4-digit LCD display with 0.5 in. (1.3 cm) high digits, separate annunciators for display units, alert, alarm, low battery, detector overload, counting overflow, and scaler counting
BACKLIGHT: pushbutton to activate
RATEMETER: can display in R/hr, Sv/h, cpm, or cps when selector switch is in RATE position
CONNECTOR: series "C" type (others available)

DISPLAY RANGE: auto ranging from 0.0 μR/hr–9999 R/hr; 0 cpm–999 kcpm
BACKLIGHT “ON” TIME: 5, 15, 30, 60, 90, 120, 180, or 240 s for backlight to stay “ON” when activated
SCALER: adjustable from 1–9999 seconds (in 1-second intervals)
SCALER COUNT TIME: adjustable from 1–9999 seconds
AUDIO DIVIDE: 1, 10, 100, or 1000 events per click
HIGH VOLTAGE: 400–2500 volts
DISCRIMINATOR: adjustable from 2–100 mV
SET MINIMUM DISPLAY: allows lower limit of auto-ranging display to be fixed, for example, display can be set to not show values less than 1 mR/hr
DEAD TIME: adjustable from 0–9999 microseconds
CALIBRATION CONSTANT: adjustable from 0.001-280 X 109 counts/display unit
DETECTOR SWITCH: rotating 5-position switch
DISCRIMINATOR ADJUSTMENTS: 1
RESPONSE:

VARIABLE: Dependent on number of counts present. Typical times are FAST 4 to 25 s, SLOW 4 to 60 s (All times stated from 10% to 90% of final reading).

FIXED: The parameter is adjustable from 10 to 25 resulting in a FAST response from approximately 2 to 50 s. The SLOW response is approximately 10 to 250 s. For MDA-type measurements, the fixed response mode is recommended.

ALARMS

ALERT/ALARM: indicated by annunciation on display and audible tone
SCALER ALARM: adjustable from 1–999999 counts

RS-232 DATA DUMP MODE: enables or disables binary dump mode to RS-232 port, when enabled binary data will be dumped every 2 seconds
RS-232 DETECTOR SETUP MODE: allows for detector parameters to be input by RS-232 port
BAUD RATE: 150, 300, 600, 1200, 2400, 4800, 9600, or 19200 bps
TEMPERATURE RANGE: -4 to 122 °F (-20 to 50 °C)
POWER: 2 "D" cell batteries housed in an externally accessible sealed compartment
BATTERY LIFE: typically 200 hours with alkaline batteries (low battery warning on LCD)