Mirion Technologies GMP-25 User Manual

NEW

GMP-25 External Beta Probe

Portable Survey Meters

GMP25

External Beta Probe

The GMP-25 represents the new design of Mirion
handheld equipment  eet. This external probe
enhances the detection capability of RADOS RDS-31
meter family.

It has been designed to ful ll the most demanding
applications in nuclear industry, HLS & civil defence
and industrial use.

The GMP-25 probe is intended for monitoring
alpha, beta, gamma and X-ray radiation. The GMP­25 is used as an external detector with the RDS-31/
iTx/iTxSD multi-purpose Radiation Survey Meters
especially for surface contamination monitoring and
source localization applications.
The GMP-25 probe is equipped with a Binder con­nector and connected to the mating bulk connec­tor interface at the bottom of RDS-31 family survey
meters.

FEATURES

• remote pulse rate measurements

• for alpha /beta/gamma surface contamination mea­surements

• converts the meter into contamination monitor

• sensitive for low levels of alpha, beta and gamma
radiation

• for general contamination and frisking

• cord lengths up to 15 meters upon request

Like other RADOS external probes, also the GMP-25
is a ” smart” probe, having an internal high voltage
generator and non-volatile memory for calibration
coe cients and probe identi cation data. Thus the
probe can be connected “on-the- y” without the
need for switching o the meter, which automati­cally recognizes the probe type and sets the meter
reading to de ned measuring unit.

Whenever an external detector is connected to the
RDS-31, the meter performs continuous dose rate
measurements with internal detector, even if an
external probe is connected to the meter, to ensure
the safety of the user.

health physics

A Mirion Technologies Division

Featuring:

GMP-25 External Probe

Portable Survey Meters

TECHNICAL SPECIFICATIONS:

GMP-25 External Beta Probe

• radiation detected: gamma-, beta- and alpha-rays

• energy range: gamma > 6 keV, beta

• detector type: GM tube 7313

> 100 keV, and alpha > 2 MeV

Emax

• pulse rate range: 0 - 50 000 cps

• mica window with active area: 15.5 cm2 (6.1 in2); window thickness: 1.5 - 2 mg/cm

• sensitivity: 2.8 cps (170cpm) for 90Sr/90Y uniform source of 0.37 Bq/cm

2

2

• equipped with retractable cord, lenght 2000 mm (78.74 in)

• temperature range: operation: -25°C to +55°C (-13°F to +131°F); storage: -40°C to +70°C
(-40°F to +158°F)

• humidity: 0 - 95% relative humidity, non-condensing

• Casing of durable ABS/polycarbonate, lenght 330 mm (13 in), width 70 mm (2.75 in)
(max)

• weight: 490 g (1.08 lb)

Th

The GMP-25 probe is equipped with a Binder connector and connected to the mating bulk connector interface
at the bottom of RDS-31 family survey meters. Other version with IKELITE 7 bulk connector and a separate
straight cable (various lengths) available upon request.

GMP-25 MDA

parameter / settings Self Count Rate BG Sensitivity Meas. Time

30 cpm 0.1 Sv/h 300 cpm / µSv/h tb = 60 s ; ts = 60 s
detectors : GM Tube source to grid separation 1 cm; Grid open area to surface = 71%
e ciency (cps / Bq) MDA
Am-241,

α

> 15%

~ 0,26 Bq/cm²

<

E: 5,4 MeV

C-14 β,
Emean: 50 KeV

Sr-90/Y-90, β,
Emean:0,8 MeV

Cl-36, β,
Emean: 0,27 MeV

> 7 ± 1% < ~ 0,55 Bq/cm²

> 35 ± 4% < ~ 0,11 Bq/cm²

> 29 ± 4% < ~ 0,13 Bq/cm²

www.hp-mirion.com

www.mirion.com

20996374_GMP25_EN_C

Mirion Technologies (MGPI) Inc
5000 Highlands Parkway
Suite 150
Smyrna Georgia 30082
USA
T +1.770.432.2744
F +1.770.432.9179

Mirion Technologies (MGPI) SA
Lieu-Dit Calès,
Route d’Eyguières
F-13113 Lamanon
France
T [phone]
F [phone]

Mirion Technologies (RADOS) Oy

P.O. Box 506
FIN-20101 Turku
Finland

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Mirion Technologies (RADOS) GmbH

Ruhrstrasse 49
DE-22761 Hamburg
Germany

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Mirion Technologies Shanghai Branch

Room 801, 78 Jiangchang
San Lu, Zhabei District
Shanghai 200436
China
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