HPXe Gamma Detectors
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TSA Systems has been in the business of designing and manufacturing SNM
(Special Nuclear Materials) pedestrian, vehicle, and hand held monitors
since 1981. TSA Systems, Ltd. was formed in 1987 with the merger of TSA
Systems, Inc., founded in 1975, and Geoscience Associates, Inc., founded
in 1961. The company has a distinguished history of providing high
quality products and service.
In 1983 TSA pioneered a new generation of all digital portal monitors,
in close conjunction with the Advanced Nuclear Technology Group at Los
Alamos National Laboratory. The first of these were installed at the
Rocky Flats Plant in 1983-84. Since then, their innovative approach to
problem solving has lead to a second generation of pedestrian and
vehicle monitoring systems.
TSA's PM-700A and PM-700AGN monitors are stand-alone, pedestrian portal
monitors with excellent sensitivity and reliability. The PM-700A's large
detectors and unique detection algorithm improve its performance to the
point that it can achieve ASTM Standard C 1169 Category III* sensitivity
All of the essential components are contained in the pillars;
radiation detectors, controllers, and occupancy detector. The systems
operate from an internal battery. The battery is constantly charged from
the site's ac line during normal operation. In the event of a power
outage, the battery permits continued operation for at least 24 hours.
Model PM-700AGN adds neutron detection capability to the basic
PM-700A. Both models are equipped with RS-232 and Ethernet
|TSA's Personnel Portal Monitor, Model PM-702, is a
highly reliable system for the radiometric protection of special nuclear
material (SNM). It is designed to exceed the criteria for an ASTM
Standard C 1169 Category II* SNM monitor which will detect 10 grams of
HEU on a walk-through basis.
TSA's vehicle portal monitor VM-250A
consists of two, self-contained, weather resistant pillars placed on
either side of the roadway to be protected. Each pillar contains two
plastic scintillator detectors, an occupancy detector, and an SCA-775
amplifier/controller. The master pillar also has a battery, power
supply/battery charger, and an SC-770 system controller.
Model VM-250AGN adds neutron detection capability to the basic
VM-250A. Both models are equipped with RS-232 and Ethernet
The VM-375A system (not shown) is essentially a VM-250A with a third
pillar positioned horizontally between the two upright pillars. The
third pillar can be mounted above or below the other pillars. The
VM-375A provides improved sensitivity over the VM-250A. Please contact
TSA to discuss configuration and requirements for VM-375A systems.
|TSA's hand held PRM-470 hand held series is a popular
choice for locating radioactive sources and measuring intensity in the
field. It uses low power CMOS electronics to provide extended operation
from the rechargeable batteries. The versatile, easy to operate PRM-470
series also features a self-test during power up, automatic background
count and user determined alarm settings. Settings may be configured
from the front panel, or from a personal computer using RS-232
communications. Count information and unit parameters are presented to
the user on an alphanumeric 4 line, 16 character display. An optional
six digit, seven segment display may also be requested.
|TSA's new Violinist IV is a full
featured, multi-channel analyzer featuring a large area this crystal
"Fiddler" type detector that is optimized for the 59 KeV Am-241 line.
The Violinist IV uses a PMT base form factor MCA and a PDA for the
system brains. The PDA allows for expanded spectra storage - field
notes - and accessories such as GPS inputs or wireless communications to
|TSA's BM-185C is designed to scan small items for
radioactive contamination. The BM-185C provides 4 ? geometry and
efficiency of greater than 35% for 60Co.
Plastic scintillator detectors are mounted on all six sides of the
counting chamber to provide uniform measurement throughout the chamber.
The monitor's high sensitivity is achieved by using six, large surface
area plastic detectors coupled with prevalent micro-processor controlled
electronics and sophisticated algorithms.
TSA's BM-285C bag monitor and the BM-286C barrel monitor are trouble
free instruments designed to measure gamma contamination of
containerized material. The BM-285C can accommodate containers of up to
500 lb., while the BM-286C is designed to hold 55 gallon drums weighing
up to 1,000 lb.
TSA's automated box monitor, model ABM-486 contains plastic scintillator
detectors which scan for radioactive contamination.
The optional He3 detectors provide neutron monitoring which detects
|TSA's model NGE-187 scans small containers in its
chamber for radioactive contamination and provides neutron monitoring
which detects shielded SNM.
|TSA's vehicle roadway monitor system, model VRM-5, was
developed to meet a requirement to survey roadways for contamination
from beta particles. The system consists of a four wheel electric
utility vehicle, a towed detector array, a Trimble GPS receiver, and a
PC based controller.
TSA's vehicle roadway monitor, model VRM-6, was developed to meet a
requirement to survey a large area for gamma contamination. The system
consists of a Polaris Ranger 6x6 all terrain vehicle with rear mounted
radiation detector array, a Trimble GPS receiver, and a PC based
The vehicle roadway monitor, TSA's model GPRS-100, integrates a Trimble
12 channel global positioning system (GPS) with TSA's model VRM-3
vehicle mounted radiation monitor and a single board PC. TSA recommends
that the system be mounted on a 3/4 ton minimum capacity, 4 wheel drive
TSA's GPRS-104 backpack radiation scanning system is comprised of the
following major subassemblies:
* Trimble GPS receiver, model AgGPS-114
* Laptop computer, palm pilot, or IPAQ hand held PC
* TSA Systems system controller, model SC-770
* TSA Systems load disconnect, model LD-260
* Battery and charger system
|The model WM-290 is a high capacity conveyor waste
monitoring system which detects gamma contamination. Accepting items up
to 28" x 30" in size, its chamber height automatically adjusts to
optimize detector geometry for a wide variety of items. After set up,
its computer controller allows for simple operation.
||The WM-295 is a conveyor waste monitor designed to scan
a variety of solid waste material for gamma contamination. The items to
be scanned are placed on the conveyor belt which transports them through
the detector chamber at a controlled speed. Contaminated items trigger a
visual and audio alarm.
||TSA's automated box monitor, model ABM-486 contains
plastic scintillator detectors which scan for radioactive contamination.
The optional He3 detectors provide neutron monitoring which detects
||TSA's model CPM-402A is a continuous pipe scanner which
detects gamma contamination. It is available with one, two, or three
|The rack controller system, model RCS-130, uses a
passive backplane which will accommodate up to ten channel cards, model
RCS-110, and one discriminator card, model RCS-120. The RCS-130 is
designed to work in conjunction with an SIF-653 interface card. These
components can be used as part of a complete system, for research
purposes, or to upgrade an existing system.
Channel card, model RCS-110:
Each channel card provides high voltage, amplification, and two
independent single-channel analyzers. The high voltage and gains are
manually adjusted on the card. The two SCA's can be used to provide
amplitude discrimination between alpha and beta signals.
Discriminator card, model RCS-120:
The discriminator card provides four independent discriminator voltages
to the channel cards in the same rack. Each voltage is individually
programmed by the computer. The discriminator levels can also be
The rack controller system, model RCS-130 can be used as part of a
complete system, for research purposes, or to upgrade an existing
TSA can also supply custom software for specific applications, including
a comprehensive list of commands for customer use.
The model SIF-653 card is the heart of a real-time data acquisition
system. It provides twenty-one 16 bit digital counter channels (seven
Intel 82C54 counters), and 24 digital I/O lines. A Z8 microcontroller
handles all of the real time processing, and transmits the resulting
data via the RS-232 port
The SIF-653 card can be plugged into a full-length PCI slot, or mounted
as a stand-alone module. The PCI slot is only used to provide +12Vdc.
The RS-232 interface is always used to read and write data.