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Ludlum Models 52-1

Personnel Portal Radiation Monitor

Introduction

● Beta/Gamma Radiation Portable Personnel Portal Monitor

● Portable, Sets Up In Minutes, Easy to Operate

● 24 in. (61 cm) Wide Opening

● Four Side Plastic Scintillation Detectors

● Wheeled Transport Case Included

● Meets FEMA-REP-21

● Excellent For Detecting Surface Contamination

● Supplied with Polypropylene Weather Sleeve

● 32 in. (81 cm) Wide Version Available - Model 52-1-1

The Ludlum Model 52-1 Personnel Portal Radiation Monitor is used for beta/gamma personnel radiation contamination monitoring and meets the FEMA standard for Emergency Response Portal Monitoring (FEMA-REP-21). It is designed to be disassembled for ease of transportation and storage, and can be set up in under 5 minutes or less without any tools. The non-volatile parameters are preset at the factory to detect a 1.0 μCi¹³⁷Cs source in a 10 uR/hr background field. The electronics are microprocessor-based for ease of setup and reliability. Status LEDs indicate count cycle status. Audible signals accompany the LEDs for additional indication. Detector counts, background, and all parameters may be viewed on the Liquid Crystal Display (LCD). All setup is accomplished by way of pushbuttons located below the LCD.

These portal monitors can be operated in a walk-through basis with a quick scan occurring while a person is positioned within the portal. In this mode, checking is performed every 200 milliseconds while the portal is occupied, 600 milliseconds before and 600 milliseconds after the portal is occupied. The portal monitor can also monitor in a stop-and-count mode, allowing for a more sensitive scan. In stop-and-count mode, the fixed count time may be set from 1 to 20 seconds. These instruments have automatic background update and dynamic alarm setting capabilities. On startup, the instrument will take a background count and calculate alarm levels for each detector. Self-diagnostic routines check the background count and warn if the background becomes either too high or too low. Alarms are calculated with a user-adjustable sigma parameter and the current background count. During setup, the user can also specify individual alarms only, sum alarm only, or both individual and sum alarm. The sum alarm groups upper detectors and lower detectors. Model 52-1 is able to operate from 85-250 Vac 50/60Hz without a voltage selector switch. They may also be operated from three “D” cell batteries. Battery lifetime is approximately 24 hours.

Specifications

PART NUMBER: 48-3172

APPLICATION: portable personnel radiation monitoring (primarily gamma radiation sensitive) designed for ease of transport, can be assembled or disassembled in less than five minutes, includes carrying case.

RADIATION DETECTORS: 4 ea. 168 in³ (2753 cm³), plastic scintillators
SENSITIVITY: This instrument will detect the beta gamma radiation emissions from a 1.0 μCi¹³⁷Cs source when it is located at mid-frame of the portal monitor in a 10 μR/hr background (per the suggested standard in FEMA report "Contamination Monitoring Standard for a Portal Monitor Used for Emergency Response", Sept 1992).
THRESHOLD: -4 mV
DISPLAY: two line x 20 character LCD shows background rates from all detectors, and sigma values above background
COUNT TIME: adjustable from 0-20 seconds (0 second setting is for walk-through mode)
LED INDICATORS:

ENTER/CHECKING: (green LED) Indicates system is ready for use. Flashing LED indicates a count is in progress.
INCOMPLETE/UPDATING: (amber LED) Indicates the user has stepped out of the portal before counting was completed or that an update is in progress.
ALARM: indicated by red LED and audible signal (greater than 60 dB at 24 in. [61 cm])

FAILURE: (red LED) indicates a high or low background

INFRARED SENSOR: senses portal occupancy

PARAMETERS: all parameters are stored in non-volatile memory
OUTPUT: RS-232 and relay output connectors located on the bottom of the electronics chassis
POWER: 85-250 Vac, 50-60 Hz or three "D" cell batteries
BATTERY LIFE: typically 24 hours in a non-alarm condition
CONSTRUCTION: aluminum housing with beige powder coat paint

WEATHER PROTECTION: crystal clear polypropylene tubing is provided to sleeve over monitor whenever protection against wet weather conditions is desired.
TEMPERATURE RANGE: -4 to 122 °F (-20 to 50 °C )

PORTAL DIMENSIONS: 83 x 28 x 17.5 in. (211 x 71 x 45 cm) (H x W x D)

PORTAL INSIDE DIMENSIONS: 81 x 24 in. (206 x 61 cm) (H x W)

TRANSPORT CASE: high-density plastic with wheels and dual padded handles

TRANSPORT CASE DIMENSIONS: 48 x 24 x 12 in. (122 x 61 x 30.5 cm) (H x W x D)

WEIGHT: 70 lb (32 kg)

SHIPPING WEIGHT: 100 lb (45 kg)

CE CERTIFIED: yes

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