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Introduction |

● Gamma Radiation Personnel Portal Monitor
● 8 Identically-Sized Plastic Scintillation Detectors
● Fast Alarm/Fast Clean Counting Technology
● Informative 9 in. Color LCD's at Ingress and Egress
● 3 Counting Modes and 4 User Modes
● Individual Detector and Sum Channel Alarms
● Automatic Background Updating
● Recount and Contaminated Detector Check Options
● PIR (Passive Infrared) Sensor to Sense Personnel Approach
● Photoelectric Sensor to Detect Personnel Presence
● 1 in. (2.5 cm) Thick Lead Shielding, with Option for 2 in. (5.1 cm)
● Ethernet Connectivity
● Option for Implementing Transmission Factors According to User's Weight
● USB Port for Printer-Free Operation and Calibration
The Ludlum Model 53 Gamma Radiation Personnel Portal Monitor detects gamma radiation in or on personnel passing through the portal from either direction. This highly sensitive portal uses eight large plastic scintillation detectors, and is shielded with either the standard 1 in. (2.5 cm) or optional 2 in. (5 cm) of lead. A user-friendly interface guides personnel through the portal monitor via automated voice prompts, and is accompanied with 9 in. (22.9 cm) color LCD articulating screens presenting the instrument readiness and status at the ingress and egress. Alarms are manifested both audibly and visually, and can be silenced and acknowledged via a control button located on either side of the instrument. Three statistical counting modes are available to maximize throughput, maximize sensitivity, or fix the count time. Several modifiable parameters adjust the alarm set point, including the false alarm probability, detection probability, background sigma coefficient (KB), and the composite sigma coefficient (KS+B). Fast alarm and clean options provide the ability to quickly determine if personnel are contaminated or clean before the entire count cycle has ended.

Operational
modes include a walk-through mode, a pause mode, and a pause-and-turn mode.
Voice prompts may be customized in any language for each of these modes.
These prompts can, for example, dictate in-house procedures to follow.
Instrument technicians have password-protected access to set up the
instrument, and to the advanced automated routines for calibrating and
verifying operation. Easily
accessible USB ports facilitate connecting a keyboard to implement changes,
input user ID, or upload revised software. The system also includes an
Ethernet link. Ludlum's optional Universal network software can be used to
log instrument status, user activity, and other information from one or
more instruments connected to the network. This software broadcasts emails
whenever radiological alarms or instrument failures occur, and has the
ability to capture images from network cameras that can be stored along with
the user ID (if implemented). A
unique feature, not found anywhere else, is an optional weight scale that
assesses the weight of the individual passing through the portal and then
assigns an appropriate transmission factor for a more accurate gamma
measurement. Other options include an additional 1 in (2.5 cm) of lead
shielding, a second alarm/light stack, and the Universal network
software.
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Specifications |
PART NUMBER: 48-3784
APPLICATION: gamma radiation personnel monitoring
RADIATION DETECTORS: 8 identically-sized plastic scintillators
(3 on each side, one overhead, one under feet),
Scintillator Type:
EJ-200
Size: 19 x
19 x 2 in. (48.26 x 48.26 x 5.08 cm) (H x W x D)
Volume: 5655 in³ total (92668 cm³)
Shielding: 1 in. (2.5 cm) standard, 2 in. (5.1 cm) optional
SENSITIVITY: will detect 10 nCi of 137Cs in 17 seconds and 10 nCi of 60Co in 8 seconds (front-and-back mode)
OPERATION: bi-directional walk through
User Modes: Walk-Thru, Pause, Pause-and-Turn, Friont-and-Back
Counting Modes: maximized throughput, maximized sensitivity or fixed count time
Status Conditions: ready, door open, clean, counting, alarm, high alarm, failure, updating background, extending background, initializing, contamination check, contaminated
Voice Commands: can be customized to any language and in-house procedure
CONTROLS/DISPLAYS
Displays: dual 9
in. (22.9 cm) color screen LCDs mounted to an articulating arm for optimized
viewing, one on ingress, the other on the egress side
Alarm Acknowledge:
single button on the ingress/egress sides that silence and clear any alarm
Portable Keyboard:
USB plug-in keyboard with convenient mounting bracket to facilitate setup,
parameter editing and calibration functions, included with instrument
Light Stack/Audio Annuciator: green (operational), yellow (warning), red (alarm) lights display instrument status, audio output is 70-85 dB at 39 in. (1 meter), mounted to either the ingress or egress sides (egress standard), a second light stack is available as an option
ELECTRONICS:
Central Processor: Single Board Computer (SBC) running Windows XP™ Operating System
Detector Signal Conditioning: Ludlum's single detector board technology located on each detector assembly
Proximity Sensors:
PIR (Passive Infrared) sensor to sense personnel approach
Photoelectric sensor to detect personnel presence
Interfaces:
USB Ports: 2 per side (ingress/egress) for connecting plug-in keyboard or user ID devices
Ethernet Connection: supports centralized and distributed viewing of instrument operation.
Optional Ludlum Universal network software connects several Ludlum instruments (including different types) to a common radiological network for performing data logging, remote alarm notification, email notification, and image capturing upon an alarm.
MECHANICAL:
Construction:
aluminum construction with ivory and brown powder coat paint
External Dimensions:
86 x 34.5 x 30 in. (206 x
94 x 53.3 cm) (H x W x L), ramp extends
17 in. (43.2 cm) per side, LCD monitors protrude 5 in. (12.7 cm) per side
Portal Opening Dimensions: 77 x 24 in. (196 x 61 cm) (H x W)
Portal Step: 4 in. high (10.2 cm)
Detector Doors/Covers:
0.060 in. (15.2 mm) aluminum
Weight:
less lead shielding: 635 lb (288 kg)
1 in. (2.5 cm) Pb: additional 1600 lb
(726 kg)
2 in. (5.1 cm) Pb: additional 2800 lb (1270 kg)
TEMPERATURE RANGE: 32 to 122 °F (0 to 50 °C)
POWER: 85–250 Vac, 50–60 Hz
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Options & Accessories |
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Weight Measuring Kit |
Model 53-1 Identical Except No Foot Detector |
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Extra 1" Lead Option Part Number 4540-257 |
Part Number 4540-292 |
Part Number 48-3150 |
Check Source |
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Technical Information |
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Product Manual |
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Ludlum Resources |