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Radiation Detector for 
Alpha, Beta, Gamma and X- Rays
 

Monitor 4
The Monitor 5  is a general purpose radiation survey detector alpha, beta, gamma and x-rays. The analog readout is displayed with a red count light and a beeper sounds with each count detected. Optional Sievert scale

 

 radiation monitor
energy range of radaition monitor
  • Halogen quenched uncompensated GM detector- 0.36 inch window
  • Alpha, Beta, Gamma and X-rays
  • Analog meter, CPM or tri-scale
  • x1, x10, x100 range switch
  • Audible beep
  • EC version for accurate linear reading above 40 KeV ( gamma and X-rays)
One sievert is equivalent to 100 rem; 
one microsievert (0.000001 Sv) = 0.0001 rem = 0.1 mR		 Sievert units radiation scale


Specifications Geiger Counter Model Monitor4
Detector  Halogen-quenched, uncompensated Geiger Muller tube with thin mica window, 1.5-2.0 mg/cm2 areal density.
Effective diameter of window is 92 mm (.36 in.).
Display: Analog meter CPM or Sievert
Accuracy:  ± 10% of full scale 
(Referenced to Cs-137)
Energy Sensitivity  
Alpha Detects alpha down to 2.5 meV. Typical detection efficiency at 3.6 meV is greater than 80%
Beta Detects Beta at 50 KeV with typical 35% efficiency
Detects Beta at 150 KeV with typical 75% efficiency
Gamma and X-ray Detects Gamma and X-rays down to 10 KeV through the window and
40 KeV maximum through the side wall
Normal background is ~ 10-20 CPM, Gamma sensistity ~ 1000 CPM/mR/hr
EC Version As above except the energy response through the detector is flat within 61% or - 26% over the range 40KeV to 100 KeV
and within the range +35% or -17% over the range 100 KeV to 1.4 MeV (referenced to Cs-137)
Operating Range CPM 0-500, 0 - 5000, 0 - 50,000
mR/hr - 0-0.5, 0- 5, 0- 50 mR/hr
µSv/hr - 0- 500, )-50 mR/hr (optional scale)
Count Light Red LED flashes with each radiation event.
Audio Indicator Internally mounted beeper (can be switched off for silent operation).
Anti-Saturation Meter will hold at full scale in fields as high as 100 times the maximum reading.
Power Requirements One 9-volt alkaline battery. Battery life is min. 200 hours at normal background radiation levels.
Temperature Range -20ºC to 55ºC (-4ºF to 131ºF)
Weight 178 grams (6.3 oz.) without battery.
Size 147 x 72 x 38 mm (5.7 x 2.8 x 1.5 in.).

 

Ordering Information
Model  
SEM4 Standard Monitor4: Includes carrying case, 1 year limited warranty and CE mark. (Batteries not included) $279.00
SEM4SV as above with Sievert-scale $279.00
SEME4EC Monitor4 EC energy compensated side wall detector, 2 mm tin filter $320.00
SEM4EC-SV as above with Sievert-scale $320.00

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Topac Inc 231 CJC Highway, Cohasset MA 02025 USA
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