Mirion Technologies GMP-25 Pancake Beta Probe - Manual (Page 2)

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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 +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 2 468 4600
F +358 2 468 4601
Mirion Technologies (RADOS) GmbH
Ruhrstrasse 49
DE-22761 Hamburg
Germany
T +49 (0) 40 851 93-0
F +49 (0)40 851 93 256
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
GMP-25 External Probe
Portable Survey Meters
20996374_GMP25_EN_C
TECHNICAL SPECIFICATIONS:
GMP-25 External Beta Probe
• radiation detected: gamma-, beta- and alpha-rays
• energy range: gamma > 6 keV, beta
Emax
> 100 keV, and alpha > 2 MeV
• detector type: GM tube 7313
• pulse rate range: 0 - 50 000 cps
• mica window with active area: 15.5 cm2 (6.1 in2); window thickness: 1.5 - 2 mg/cm2
• sensitivity: 2.8 cps (170cpm) for 90Sr/90Y uniform source of 0.37 Bq/cm2
• 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 μSv/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%
effi ciency (cps / Bq) MDA
Am-241, α
E: 5,4 MeV
> 15% < ~ 0,26 Bq/cm²
C-14 β,
Emean: 50 KeV > 7 ± 1% < ~ 0,55 Bq/cm²
Sr-90/Y-90, β,
Emean:0,8 MeV > 35 ± 4% < ~ 0,11 Bq/cm²
Cl-36, β,
Emean: 0,27 MeV > 29 ± 4% < ~ 0,13 Bq/cm²