RADOS RTM644lnc
Large Clearance Monitoring System
CheckPoint:Waste™ family
RADOS RTM644lnc
Large Clearance Monitoring System
Class XL
Typical deployment areas for the members of the
CheckPoint:Waste™ family are the boundaries
between controlled and clean areas of nuclear-
licensed sites. Throughput requirements and typical
size and shape of goods are accommodated by a
number of different CheckPoint:Waste™ models.
FEATURES
•qualied method to release non-radioactive materials
from nuclear facilities on the basis of dened clearance
levels
•means for measurement of large waste amounts from
nuclear facilities
•large measurement chamber
•low detection limits
•display of measurement value in Bq, Bq/g and Bq/cm
•graphic display of activity distribution
•calibration menu for different geometries and densities
•measurement data administration
•fully-automatic or manual feed of measurement material
•24 large area Gamma-plastic detectors to attain
homogeneity judgement
•complete 4π lead shielding
2
Clearance measurement is a proven method to
release materials from nuclear licensed sites for
possible recycling. This provides both an economic
benet as well as a release pathway from the nuclear
licensed site.
The CheckPoint:Waste™ RTM644lnc is a reliable
and fast monitor for release measurement of different
measurement objects such as palettes, waste bags
or grid boxes. User guidance and an easy-to-navigate
menu for materials make work simple and safe.
The RTM644lnc should be operated by instructed
operators only.
health physics
A Mirion Technologies Division
Featuring:
MEASUREMENT PHILOSOPHY
Release strategy and task
Release management allows the recycling of material
(such as machine parts, concrete rubble, cables,
tubing, metal sheets or insulator material). Hereby the
role of clearance measurement stations (CMS) is to
conrm the adherence to clearance criteria for large
quantities of materials.
Job definition fundamentals
It is the responsibility of the regulator in cooperation
with the industry to develop accepted release criteria
depending on the release path and the intended
destination. Clearance measurement provides
conrmation regarding the contamination or activity
of a measured material in the required nuclide
specic limits.
Clearance measurement principle
The correct operation of a clearance measurement
station is based on calibration. Thereby activities in
the measurement material matrix are related to the
measurement response of the system. The shielding
effects and the shape (geometry) of a measurement
item has to be taken into account. The importance
of this subject increases if large masses are to be
handled.
Consideration of all nuclides with their limits, even if
the CMS is capable to measure gamma nuclides only,
is also an important feature of any CMS.
RADOS CMS brief (RTM644lnc)
The RTM644lnc measurement system operates
geometry-oriented. That means the user selects a
measurement object and its lling level. Depending
on this geometry and the weight (provided by
an integrated scale), the RTM644lnc selects the
appropriate calibration for measurement. Material
type and disposal target have to be selected by the
user.
The performance of the RTM644lnc can be
congured to serve customer specic disposal
pathway requirements.
A link-up to a customer specic material control
system is possible.
Waste assignments for nal disposal when
applying release measurements (from 100 % total mass of material)
2 %
Waste for
nal disposal
6 %
Recycling after
reprocessing
92 %
No restrictions
MONITOR DESCRIPTION
The RTM644lnc is a clearance measurement station
consisting of a measurement chamber with motor-
operated swing door(s) and chain conveyor. Materi-
als are checked for gamma radiation in the shielded
measurement chamber. The conveyor system is
used as a carrier for the measurement material. The
evaluation and display of measurements is carried
out by a measurement PC with a real-time operat-
ing system. A PLC is used for the control of the door
as well as of the chain conveyors. The control of the
motors and the signals is realized in dependence to
the inputs from motors and switches on end points.
Layout of the 24 Detectors
The measurement chamber features an array of 24
detectors arranged in a 4π geometry. All detectors
are covered in a robust aluminium housing with their
high voltages and discriminator thresholds controlled
by the computer operating
system
12
12
12
12
orh11olh
orh11olh
orh11olh
orh12orh11olh11olh
10
10
10
10
orv9olv
orv9olv
orv9olv
orv10orv9olv9olv
r top l o left u
r top l o left u
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3
3
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loh3loh4 luh4 luh
1
1
1
1
lov2luv
lov2luv
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Detector-layout
Options
2nd door with additional conveyor, increased shield-
ing, container tted unit, and ofce container are only
a few of many available options for the RTM644lnc.
for material
l rear r
l rear r
23
23
23
23
21
21
21
21
hor
hor
hor
hor23hor
hol
hol
hol
hol21hol
24
24
24
24
22
22
22
22
hur
hur
hur
hur24hur
hul
hul
hul
hul22hul
16
16
16
16
15
15
15
15
urh
urh
urh
urh16urh
ulh
ulh
ulh
ulh15ulh
14
14
14
14
13
13
13
13
urv
urv
urv
urv14urv
ulv
ulv
ulv
ulv13ulv
18
20
18
20
18
18
18
20
20
vul
vur
vul
vur
vul
vul
vul
vur
vur20vur
17
19
17
19
17
17
19
19
vol
vor
vol
vor
vol
vol17vol
vor
vor19vor
l front r
l front r
8
8
8
8
ruh7roh
ruh7roh
ruh7roh
ruh8ruh7roh7roh
6
6
6
6
ruh5rov
ruh5rov
ruh5rov
ruh6ruh5rov5rov
u right o
u right o
D
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FUNCTIONAL DESCRIPTION
RTM644lnc measurement procedure
•Load the chamber using the plc controlled chain
conveyor and doors.
•Input of measurement data.
The measurement starts after the chamber has
been loaded and the doors are closed.
•Measurement time calculation based on
background level, background reduction (mass of
material), natural activity(s), path of disposal (alarm
levels), calibration, nuclide vector and statistical
parameters.
•Measurement result.
Display of measurement value
•graphic display of activity distribution and activity
position as a deviation from average value in %
•measurement value display in Bq, Bq/g, Bq/cm²
•large objects can be measured with open door(s)
Logged measurement data
•date and time of measurement
•material type and weight of measurement material
•session and operator
•specic activity in Bq/g and Bq/cm² and total
activity in Bq
•measurement limit exceeded
•nuclide-related activity
Calibration
The use of a calibration is to get the relation of the
count rate to the activity and to take all inuencing
factors into account.
The RADOS lnc method (leading nuclide correlation) allows
the validation of all nuclides in the predened vector. It
also simplies the calibration procedure.
Although calibration can be performed by the customer,
RADOS is also offering a calibration service. The import of
existing calibrations is also possible.
SERVICE
The RTM644lnc is almost free of the service requirements.
The testing and calibration is supported by dedicated
software functions, such as a large array of self test, an in-
tegrated testing support function and the optional system
check module.
REFERENCES
The RTM664lnc has been delivered, successfully accepted
and is operating in the following plants (excerpts from
reference list):
Nuclear Power Plants:
Isar, Obrigheim, Mühlheim-Kärlich, Stade, Gundremmin-
gen, Krümmel, Würgassen, Ignalina (Lithuania)
Others:
•Detector-Efficiency
•Nuclide
(Energyand emission rate)
Geometry &Mass
Research Center Jülich (Germany),
Waste Repository Zwilag (Switzerland),
Technical University Munich (Germany),
•Absorbtioninside the material
•Massofthe material
•Geometrically dimensions
GNS (Germany)
Health Physics
Division
100 kg 300 kg 600 kg t
m
60
Co 55 Bq 70 Bq 100 Bq 60s
137
Cs 170 Bq
210 Bq 280 Bq 60s
Large Clearance Monitoring System
Technical Specifications: CheckPoint:Waste™ RTM644
Detector Type Size
RADOS
Plastic Scintillation Detector
detector housing, shielding aluminium, 3 mm, 4π with 50 mm lead bricks
Electronics Industrial PC, hard disc, CD-RW disc drive, LC-display, keyboard with mouse,
Software Real-time, multi-tasking operating system QNX (UNIX like, POSIX compliant),
RPD25/125
RPD15/78
RPD14,5/72,5
50 x 50 x 5 cm
42 x 37 x 5 cm
50 x 29 x 5 cm
printer interface, USB device, operators desk, electronics cabinet, control console
user software, System Check tool, lnc (leading nuclide correlation)
RADOS RTM644lnc
CheckPoint:Waste™ family
Dimensions
(see also gure)
overall 1900 mm x 1800 mm x 2150 mm
chamber 1360 mm x 1120 mm x 1200 mm
weight approx. 12 000 kg to 16 000 kg
Environmental Conditions Temperature 0 °C - 45 °C
Relative humidity < 75 %, max. 95 %
on yearly average, no condensation
EMC Compliant with European Electromagnetic
Compatibility Directives
Mechanical options Installation in container,
setup with ofce container on request
1800
Minimum detectable activity (MDA)
Some examples for geometry and nuclides
for a grid box with a lling level of 100 %
parameters: t0 = 300 s BG = 0.15 µSv/h,
K1-α = 1.65 s (false alarm safety);
K1-ß = 1.65 s (detection safety);
K1-γ = 1.65 s (condence level)
1900
customer requirement
Mirion Technologies (MGPI) Inc
5000 Highlands Parkway
Suite 150
Smyrna Georgia 30082
USA
T +1.770.432.2744
F +1.770.432.9179
Since norms, specications and designs are subject to occasional change, please ask for conrmation of the information given in this publication.
© Copyright 2008, All rights reserved. For trademark and registered trademark information. The copyright in this work is the exclusive property of Mirion Technologies
(RADOS) GmbH and is protected under the laws of Germany and other countries worldwide.
customer requirement
Mirion Technologies (MGPI) SA
Lieu-Dit Calès
Route d‘Eyguières
F-13113 Lamanon
France
T +33 (0) 4 90 59 59 59
F +33 (0) 4 90 59 55 18
Mirion Technologies
(RADOS) Oy
P.O. Box 506
FIN-20101 Turku
Finland
T +358 2 4684 600
F +358 2 4684 601
2150
Mirion Technologies
(RADOS) GmbH
Ruhrstrasse 49
D-22761 Hamburg
Germany
T +49 40 85193 0
F +49 40 85193 256
www.mirion.com
7NUC_RTM644_Y015-042E_3_PDB
Mirion Technologies Shanghai Branch
Room 801, 78 Jiangchang
San Lu, Zhabei District
Shanghai 200436
China
T +86 21 6180 6920
F +86 21 6180 6924
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