KEYCOM provides solutions in the 300 GHz to 1 μHz frequency range (SHF/EHF/MW/UHF/VHF/ULF).
We undertake designing, manufacturing and measuring. Please feel free to contact us.

Alanine dosimetry ESR(EPR) equipment

Model No. esr31

It is the portable ESR( electron spin resonance) device which KEYCOM Co., Ltd. developed.
It is for alanine dosimetry.
It specializes a measurement for an alanine origin radical.
It conforms to JIS standard (JIS Z4571).
It is the device more compact for high sensitivity than the general-purpose device by setting microwave frequency in 9.8GHz, 350 resonance magnetic field mT.
We realized through PC control and succeeded in what we used the Mn2+ signal which became inside standard and adopted for revision of magnetic field strength and the absorption strength.

      ESR X10SA Version2 Alanine molecule.
Amino group (NH2-) in the molecule comes off by high energy irradiation and I become radical and show a special ESR spectrum.
The method of estimating the exposed dose measuring this amount of the radical is called ESR dosimeter.



• It is very compact size (28(W) x 26(D) x 35(H)cm). It is the portable ESR device, easy to use on the site.
• It has the measurement sensitivity more than standard type X band ESR system.
• The miniaturization of about 27kg in weight was achieved by the adoption such as rare permanent magnets.
• That is, for process monitoring, desktop PC by ESR handheld sensor, remote measurement, and utility applications.
• Single target specification: We design the magnetic field, the frequency, and the output, etc. according to your requirement.


Measurement by PC

If You connect a PC on hand and turn on a power supply, Resonator Adjusting Window appears automatically, and measurement operation is started.



    Mesurement window


• The resonance characteristic is adjusted with Resonator Adjust Window, the measurement condition is controlled with Condition Setting Window, and after the setting, everything is controlled with Measurement Window.
• It multiplies according to the purpose, and the blank data and the correction, etc. are set.
• The moving average can be selected.
• Data processing (height h of the peak and one time & integration etc. twice) can be specified.
• A target point is read in the cursor line. (Refer to the chart. )
• The automatic compensation of magnetic field strength can be done at the signal position of Mn2 +.


Example of measuring alanine origin radical

Making of ESR spectrum and noise by multiplication measurement of unirradiation and alanine film that irradiates 26Gy (3 times and 50 times) (GAIN x 1000) decrease   (document)Excerpt from industrial Tokyo metropolitan technological laboratory research report the 7th (2004) and 49-56



Sample tube (standard) 5φ Quartz sample tube
Sample setting Prescribed sample holder and stopper
Microwave frequency 9.8 GHz (JIS)
Microwave output 0.1-10 mW (JIS)
Magnetic field setting area 350 mT
Width of magnetic field sweep 20 mT (JIS)
Magnetic field sweep speed 0.5, 1, 2, 5, 10 min
Signal amplification level Analog amplification: x1, x10, x100, x1000 (4-step switch),
Digital amplification: x1, x2, x5 (3-step switch)
Signal output area ± 10 V
PC environment Windows PC,  Data recorded in CSV style
Size 28(W) × 26(D) × 35(H) cm
Basic machine weight About 27 Kg
Power supply (standard) AC 100 V,  120 W max.