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IM 201M – Mobile Iodine Monitor

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  • Room monitoring of Iodine I-131
  • Embedded Am-241 source for energy spectrum stabilization against temperature changes and aging
  • 1024 channels spectrum analysis
  • Effluent trapping of both molecular and organic forms of iodine

The mobile iodine monitor IM 201M, continuously measure gamma volumetric activity from a radioactive iodine sample. Both in molecular and organic forms (methyl iodine). Typically the IM 201M is used to monitor iodine content in air drawn from stacks, ventilation ducts or working areas.

The spectroscopic 1¼” x 1″ NaI(Tl) detector faces the activated charcoal cartridge in which radioactive iodine is trapped. The proximity of the detector and the cartridge is shielded with 5 cm lead in 4π. A radioactive Am-241 source built into the NaI crystal allows drift compensation due to temperature or age.

Data sheet


Göran Jonsson


Technical specification

Radiation detected: gamma
Detector: 1¼” x 1” NaI(TI) scintillator + PM
Iodine cartridge: 57.7 mm
Energy range: 100 keV to 3 MeV
Typical energy windows: 314 – 414 keV (I-131)
1024 channels spectrum
Typical measurement range: 3,7Bq – 370 kBq/m3

Long term temperature: +10°C to +40°C
Maximum short term temperature: +0°C to +55°C
MTBF: > 20 000 hours
TID: 100 Gy

Standard fl ow rate: 35 l/min
Pressure drop: according to the filter dust loading

Dimensions: 1406 mm x 520 mm x 700 mm
Weight: ~ 200 kg
Color: gray RAL 7030 (decontaminable paint)
Inlet tube connection: Ø 12 mm OD

Power supply: 230 Vac – 50 Hz
Data link outputs: 1 RS232 and 2 isolated RS485
Alarm relays: 3 SPDT relays
I/O: 2 isolated analog outputs and 1 isolated analog input (0/4-20 mA)

Alphanumeric display: measurement, status…
Sound alarm: L(p) = 90 dBA at 1 meter
Visual alarm: 3 lights (red, yellow, green)

Nuclear: IEC60761, IEC61171
EMC: 2006/95/CE and 2004/108/CE, IEC61000-6-2 and IEC61000-6-4

With or without dust filter holder
With or without output dust filter

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