Personal Radiation Detectors PM1401GNA / GNB

The gamma-neutron personal radiation detectors allow searching and detecting of radioactive and nuclear materials. The detectors have a hermetic and shockproof case and are ideal for operation in the unfavorable and/or harsh environment.
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Polimaster’s gamma-neutron personal radiation detector PM1401GNA is designed to detect the slightest amounts of the gamma and neutron radiation emitting materials especially in the extreme environment and the difficult-to-access areas. The optional telescopic extension tube can be used to protect the user from the radiation sources and/or inspect difficult-to-access areas. The instrument is equipped with a CsI(Tl) scintillation detector for detection of the gamma irradiation and a He-3 detector for detection of the neutron irradiation. The detector will alert the user if the radiation levels exceed the preset threshold values.

The PM1401GNA performs the following functions:

  • Detect gamma and neutron radiation sources, even if they are shielded;
  • Search for and locate the gamma or neutron radiation sources;
  • Alert the user of the presence of a radiation source through audible, visual and vibrating alarms;
  • Record and store data for up to 1000 events in the instruments' non-volatile memory;
  • Transmit all recorded data to a PC via IR channel for the data processing and analysis.

Once the personal radiation detector PM1401GNA is turned on, it automatically starts taking measurements and storing the background radiation information. The instruments can detect even the slightest increase in radiation environment that causes the radiation levels to exceed the preset thresholds. The instruments' advanced processing algorithm enables the user to update the background levels and setup the alarm thresholds, thus adjusting to the specific radiation environments and satisfying the requirements for the false alarm rate.

The PM1401GNA is additionally designed to ensure adequate adaptation to the background level so that the instrument can locate a radioactive source even in the changing radiological environments. For example, the detector is able to detect radiation sources when the background decreases due to radiation shielding or when the background radiation intensity is high requiring the source to be located among high radiation level.

The PM1401GNA has a hermetic and shockproof case and the LCD screen's fluorescent backlight for easy operation even in the harshest, most unfavorable environments or weather conditions. The personal radiation detector is recommended for the use by first responders, security guards, police, customs officers and border patrol. No special experience or training is necessary to operate the instrument.


In addition to the functions of the PM1401GNA model, the PM1401GNB model has Bluetooth module for communication with PDA or laptop PC, equipped with Polimaster proprietary identification software, and can be used for the radioisotope identification of the radiation source.

The Bluetooth module allows user to be at a safe distance from the possible radiation sources while the PM1401GNB is operating. In that way, the instrument's operator is being protected from the radiation exposure by distance.

Standards compliance

Designed to meet ANSI N42.32-2006, ANSI N42.33 -2006, IEC 62401:2007,ITRAP+10 (IAEA) requirements

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He-3 He-3
for 137Сs, no less
100 (s-1)/(μSv/h)
(1.0 (s-1)/(μR/h))
100 (s-1)/(μSv/h)
(1.0 (s-1)/(μR/h))
for 241Am, no less
200 (s-1)/(μSv/h)
(2.0 (s-1)/(μR/h))
200 (s-1)/(μSv/h)
(2.0 (s-1)/(μR/h))
- for Pu - α-Be
- for thermal neutrons
- for Pu - α-Be on a phantom or
in the moderator chamber

- 0.1 (counts·cm2)/neutron
- 7.0 (counts·cm2)/neutron
- 1.0 (counts·cm2)/neutron

- 0.1 (counts·cm2)/neutron
- 7.0 (counts·cm2)/neutron
- 1.0 (counts·cm2)/neutron
Energy range
0.033 – 3.0 MeV0.033 – 3.0 MeV
from thermal to 14.0 MeVfrom thermal to 14.0 MeV
DER indication range
0.01 – 99.99 μSv/h
(1 – 9999 μR/h)
0.01 – 99.99 μSv/h
(1 – 9999 μR/h)
1 - 999 s-11 - 999 s-1
DER measurement range0.1 – 70 μSv/h (10 – 7000 μR/h)0.1 – 70 μSv/h (10 – 7000 μR/h)
DE indication rangexx
DE measurement rangexx
Accuracy±30% ±30%
Response time0.25 s0.25 s
Radionuclide identification using
Bluetooth communication with
external Pocket PC or smartphone
Special nuclear materials (SNM)
x233U, 235U, 237Np, Pu
Medical radionuclides 
x18F, 67Ga, 51Cr, 75Se, 89Sr,
99Mo, 99mTc,103Pd, 111In,
123I, 131I,153Sm, 201Ti, 133Xe
Naturally occurring radioactive  materials (NORM)
x40K, 226Ra, 232Th and daughters,
238U and daughters
Industrial radionuclides
x57Co, 60Co, 133Ba, 137Cs, 192Ir,
226Ra, 241Am
Alarm typevisual, audio, vibration (external)visual, audio, vibration (external)
Data recordingup to 10001000
Environmental protectionIP65IP65
Drop test on concrete floor0.7 m (2.3 ft) 0.7 m (2.3 ft)
Power supplyone cell XTREME POWER LINE АА (LR6)one cell XTREME POWER LINE АА (LR6)
Battery life timeno less 1000 hno less 1000 h

Operating temperature-30°C to 50°C
(-22°F to 122°F)
-30°C to 50°C
(-22°F to 122°F)
Size (without cover)195х57х32 mm

195х57х32 mm
Weight without package
0.45 kg0.45 kg
Low battery warningLCDLCD
Overload indication
PC CommunicationIRDAIRDA, Bluetooth