Single Detector Manual
The G510 (1-1/4 inch detector ) and G520 (2-1/4 inch
detector) provide an economical system for people with limited sample
loads but who can not compromise on the background or efficiency of the
measurement. G510/520 systems can be upgraded in the field to fully
automatic systems is your needs increase.
Single Detector Auto Changer (50)
The G5010, (1-1/4 inch detector) and G5020 (2-1/4 inch
detector) automatic systems address the need to free up the operator
while a set of samples processes. Reporting options let you choose
between individual report per sample or a batch oriented report.
Swipes, air filters, and some water samples are typical applications.
(Available for 1 inch, 2 inch or 5 inch diameter samples, 30, 40, or
50 sample capacity and up to 3/16 planchet depths)
Single Detector Auto Changer (50 Tower)
The Tower model is much the same as the console model
but with dual cartridges of 25 samples each which can accommodate
planchets up to 1/4 inch deep for water samples where the solid
concentrations require you load up to 15ml of sample before drying.
Note: The deeper sample depth has drawbacks in efficiency and cross talk
you may wish to avoid if your sample prep does not really require it.
The Tower model is not available with a 5 inch diameter detector.
Single Detector Auto Changer (100 Tower)
The 100 Tower is just a higher production volume version
of the 50 tower.
The G5410, (1-1/4 inch detector) and G5420 (2-1/4 inch
detector) AutoQUAD systems address the needs of high volume labs. The
measurement performance is the same as the single detector systems but
the throughput is quadrupled. The counting detectors are arranged in a
2x2 pattern with a common guard detector. All gas flow is in parallel so
that if one detector window fails the other 3 are not compromised
many labs need this capacity, but if you do, there is a dramatic initial
cost savings vs the same capacity in individual systems and a continuing
savings in reduced labor.
Large air sampling programs and large D&D programs are typical
Auto-Quad 400 (100x25)
The G5420-100T, also known as the AutoQUAD 400, Has the
ability to load and process 400 samples in a set is a further capacity
expansion on the base AutoQUAD. It's not for everyone but is a
productivity workhorse if you can keep it busy. Note that 100 sets at
10min count time each fills up the two back shifts leaving the day shift
open for reporting, unloading, reloading, and QA.
Traveler – high performance portable
The TRAVELER is a deployable version of our laboratory
based console systems. The lead shielding was carefully minimized in a
special cast design that has absolutely minimal effect on background
while reducing the system weight to <400 lbs. The TRAVELER can be easily
dissembled, deployed, and reassembled by a 2 man crew with a SUV in <1
hr, not including travel.
Mini-T very portable – no Gas!
The Mini-T is a quick screening system for use when
transportability if of maximum concern. The detector is a scintillation
type with no gas required. This does have a significantly higher beta
background than the gas flow systems but it comes in a compact package
that can be checked as standard commercial airline baggage.
provides the advantage of automation and PC reporting relative to other
similar scintillation systems that are totally manual.
The Mini-T is the one system that does not automatically come with
installation and on site warranty.
16 Detector Manual
Sometimes samples come in or are prepared in batches and need to be
counted immediately - not waiting in the queue of a single detector
system. For these applications the G540 manual systems come in 4, 8, 12,
and 16 detector configurations and with either one inch or two inch
detectors. We can also supply systems with a single five inch detector
per drawer and can mix and match detector drawers in the same system.
G540 systems come with independent start-stop and independent voltage
for each drawer so that it can be deployed against a simultaneous mix of
sample types. The drawers have their own independent gas distribution
and control and have a parallel gas flow so that a window failure or
dirt contamination does not interrupt the operation of the other
detectors in the drawer or in the system
If you start with less that 16 detector you can upgrade in the field
to the full 16 or some step in between.
Gamma NEVER ends support for our systems in the field!
Since its initial introduction in 1979 the G3000 has
become the de-facto standard for a Marinelli changer. One unique
advantage of the G3000 for Marinelli beakers is that it handles them
from the bottom. This eliminates problems with gripping the containers
or dropping them. It also side steps most of the alignment problems
associated with other handling methods. The G300 can also easily adapt
to other large container sample geometries with adapters.
The G3000 has self-contained PC smarts and runs as an RS232 slave
device to the MCA's computer system. The G3000 comes in sizes ranging
from 16 inches cube to 24 inches cube for different sizes of Marinelli's..
The auto door completes near 4pi shielding (except the detector entry)
G3000 are available in lead or steel construction depending on what you
are looking for in your samples.
Ra-228 via gamma spec changer
The Ra-228 changer is a combination of the shield from
the standard G300 Marinelli changer system with the elevator from the
a/B systems. The application is specific: Ra-228 analysis for drinking
water based on a precipitated planchet sample. The internal component
materials are specified and selected for minimum background contribution
in the areas of interest for Ra-228. This system also offers a dry
nitrogen or dead air purge system for sample storage to minimize the
radon daughter contamination contribution.
G-11 round shield - graded lead
The G-11 is a classic round design with an 11 inch
diameter by 16 inch high cavity. Typically there is a split top with one
half swinging each way but a single piece top can be supplied. All
standard detectors can be accommodated but the in-line or stream-line
detector configurations without a pre-amp box are the easiest.
G-11, shown, has the optional "slot" which is a removable plug that
joins the detector entrance hole in the bottom to an extended vertical
opening on the front of the shield. This allows vertical dipstick
detectors to be easily installed and removed from the shield without
removing it from the dewar. If you have ever been scared of damaging a
detector because you have to pull on the end cap far harder than you are
comfortable pulling, just to get it out of the shield or later fight to
get that now frosted-up dipstick back into a tight LN2 fill collar, you
will appreciate this little piece of low tech safety & convenience.
Roll top - steel or graded lead
Roll Top - shield is the classic shield form factor
before the round G-11 style became popular, Roll Tops can be made with
lead or steel walls typically in 4 or 6 inch thickness. Common ID sizes
are: 12x12x12, 12x12x16 tall, 16x16x16 and 24x24x24 but almost any size
can be made to order. A "slot" as described above in the G-11
description is also optional with the Roll Top
J-shield - graded lead
The G-11 J version is an adaptation for the low
background J or NPR germanium detector cryostat configurations. Shield
performance in high background areas is improved. For ultra low counting
applications shielding from the relatively higher background detector
components such as the vacuum sieve and pre-amp components makes a
meaningful improvement. Access to the cavity for sample loading and
unloading is lower and most people think easier but the floor space
requirements is approximately double relative to the standard G-11.