Model 53

Gamma Portal Monitor

Model 53 Radiation Portal Monitor Model 53 Radiation Portal Monitor screen capture Model 53 Radiation Portal Monitor software results Model 53 Radiation Portal Monitor close up

Features

The Model 53 Gamma Personnel Portal detects gamma radiation in or on personnel passing through the portal from either direction. This highly sensitive portal uses eight large plastic scintillation detectors. Shielding is accomplished with either the standard 2.5 cm (1 in.) or optional 5.1 cm (2 in.) thickness of lead. A user-friendly interface guides personnel through the portal monitor via automated voice prompts, and is accompanied with 22.9 cm (9 in.) 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 control buttons 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 (K B ), and the composite sigma coefficient (K S+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.

There are also four user modes to choose from that include a walk-through mode, a pause mode, a pause-and-turn mode, and a front-and-back 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). See the "Options" tab for more information and other available options.

Specifications

Indicated Use Gamma personnel monitoring
Detectors 8 identically-sized plastic scintillators (3 on each side, one overhead, one under feet)
Scintillator Type: EJ-200
Size (H x W x L): 48.26 x 48.26 x 5.08 cm (19 x 19 x 2 in.)
Volume: 92.7 L total (5655 in3)
Shielding: 2.5 cm (1 in.) standard, 5.1 cm (2 in.) optional
Sensitivity Will detect 10 nCi of 137Cs in 17 seconds and 10 nCi of 60Co in 8 seconds (front-and-back mode)
Operation

Controls/Displays

Electronics

Temperature Range 0 to 50 °C (32 to 122 °F)
Power 85 to 250 Vac, 50/60 Hz
Construction Stainless steel construction with ivory powder coat, forklift slots in base
External Dimensions (H x W x L) 220.1 x 87.3 x 76.1 cm (86.7 x 34.4 x 30 in.), Ramp extends 43.2 cm (17 in.) per side, LCD monitors protrude 12.7 cm (5 in.) per side
Portal Inside Dimensions (H x W) 195.7 x 61.9 cm (77.1 x 24.4 in.)
Portal Step 10.2 cm high (4 in.)
Detector Doors/Covers 15.2 mm (0.06 in.) aluminum
Weight Less lead shielding: 288 kg (635 lb)
2.5 cm (1 in.) Pb: additional 726 kg (1600 lb)
5.1 cm (2 in.) Pb: additional 1270 kg (2800 lb)

Ludlum Model 53 manual

Manual