Multipurpose Hand-Held Radiation Monitor PM1401K / KM

The small-size light-weight multipurpose radiation monitor for detection of alpha, beta, gamma and neutron radiation sources. Recommended for wide range of radiation monitoring procedures.
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Polimaster’s PM1401K / KM Multipurpose Radiation Monitor is designed for detection of alpha, beta, gamma and neutron radiation sources as well as for gamma spectra accumulation and precise measuring of gamma dose rate and levels of contamination of surfaces, contaminated with alpha and beta sources.

PM1401K Radiation Monitor is the smallest and lightest instrument in the world which is capable to operate simultaniously as an alarming device, search instrument, survey meter, spectrometer and identifier.

Available modifications:

PM1401K is equipped with alpha, beta, gamma and neutron detectors.

PM1401KM is a light modification, equipped with alpha, beta and gamma detectors (without neutron channel).

The PM1401K / KM perform  the following tasks:

  • Detect, search and locate the alpha, beta, gamma (both modifications) and neutron (only PM1401K) radiation sources;
  • Measure levels of contamination of surfaces, contaminated with alpha and beta irradiating sources;
  • Measure precisely the dose rate;
  • Alert users of the presence of a radiation source via both audible and vibrating alarms;
  • Record and store up to 500 event and 100 gamma spectra in its non-volatile memory;
  • Transmit all of the recorded data to a PC via an IR channel.



  • First responders
  • Security guards
  • Police
  • Customs officers
  • Border patrol


Additional accessoires:

  • External Vibration-Alarming Device that allows the instrument’s user to be notified secretly of potential radiation sources without drawing the attention of other observers;
  • Telescopic Extension Tube, which allows the instrument to take measurements in otherwise difficult-to-access areas and ensures a higher degree of radiation protection for the user;
  • External Neutron Moderator for PM1401K modification to increase the neutron sensitivity by a factor 10.


PM1401K / KM  instrument is assigned NSN 6665-33-208-9126.

Standards compliance:

Designed to meet ANSI N42.33 -2006, ANSI 42.34 - 2006, IEC 62327: 2006 requirements


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PM1401K / KM
Search γ-channel
Sensitivity for 137Сs, no less
200 s-1/(μSv/h) (2 s-1/(μR/h))
Sensitivity for 241Am, no less
200 s-1/(μSv/h) (2 s-1/(μR/h))
Energy range in Search Mode
0.03 - 3.0 MeV
Indication range
DE measurement range
Accuracy of DER indication (at 137Сs)
in the range of 0.1 – 20 µSv/h (10 – 2000 µR/h),
no less
Gamma radiation scintillation spectra
acquisition channels
The number of γ-radiation scintillation spectra
saved in the instrument’s memory

up to 100
Activity measurement sample
density range
Accuracy of 137Cs nuclide activity measurementx
Sensitivity to 137Cs in the activity measurement mode
137Cs activity measurement range
when using Marinelli beaker
Search neutron channel
Slow neutron counter (only in PM1401K)
- for Pu-α-Be
- for thermal neutrons
- for Pu-α-Be (with neutron moderator)
Neutron count rate measurement energy range
0.025 eV - 14 MeV (only in PM1401K)
Indication range
DER measurement range
(by Pu- α-Be source in collimated radiation)
Measuring γ-channel
Dose equivalent rate measurement range
0.1 μSv/h - 100 mSv/h
Dose equivalent rate measurement energy range0.015 - 15 MeV
Measuring α and β-channel
a-radiation flux density measurement range

15 min-1cm-2 to 105 min-1cm-2
Sensitivity to α- radiation (239Pu)
β- radiation flux measurement range
6 min-1cm-2 to 105 min-1cm-2
Sensitivity to β- radiation (90Sr+90Y)
Energy range of the measured of β-radiation flux
0.15 - 3.5 MeV
242 x 58 x 57 mm (9½'' x 2¼'' x 2¼'')
650 g (22.9 oz)
Ingress protection code
Drop test on concrete floor:
CommunicationIRDA, Bluetooth
-30°C to 50°C (-22°F to 122°F)
up to 95 % at 35 °С (95 °F)
Battery type
one AA battery
Battery lifetime
600 h

*using LCD backlight, audible and vibration alarms for no more than 5 min/day
and Bluetooth communication turned off
Power supply