6
BP1/4A
A small, end
window GM
probe with an
integral cable,
designed to
detect high-ener-
gy beta, x-rays
and gamma rays. Suitable for teaching
and demonstration purposes and also
used to pinpoint x-ray shield leakage.
This probe can be matched with
Thermo's portable survey meters,
such as the Electra/Delta Series.
• Connector: PET
An energy compensated GM detector
in a rugged light alloy housing, used
for low-level surveys. Sensitivity is
equivalent to industry types MC71 and
TGM 5368. This probe can be
matched with Thermo's portable sur-
vey meters, such as the Electra/Delta
Series.
• Doserate range: 0.1 µSvh
-1
, (10 µR/h)
to 200 µSvh
-1
, (20 mR/h) when used
with the Electra or Delta5 with Dead
time correction
• Operating HV: 450 V
• GP20B/R, GP20B/Sv connector, MHV
GM Probe Data
Model
number
App. Sensitivity
cpm/mR/h
Energy
comp.
Efficiency
Alpha Beta(4π)
Dead
time
137
Cs
230
Th
241
Am(4π)
14
C
147
Pm
99
Tc
90
Sr/
90
Y
(µs)
GP20B/R Y
GP21B/R
HP-190A Cont. 2500 N 6% 10% 25% 35% 200
HP-210 Cont. 3600 N 25% 6% 15% 32% 50
HP-220 Exp. 19 (
60
Co) N 30
HP-270 Exp. 1200 Y 100
HP-290 Exp. 80 Y 100
HP-360 Cont. 3600 N 25% 6% 15% 32% 50
IGP24A/Sv 137 Y
MC71 Y
SL,SLR
SWGM 1600 — — 15% 100
PGM/ECPGM 3600 50% 10% 20% 30% 45% 50
GM Probes/Data
BP1/4A
GP20 Family
•
Sv versions measure
Ambient Dose Equivalent
•
R versions measure
exposure
•
Energy range:
60 keV–2 MeV
•
HV: 450 V
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