Radiation measurement

The radiation detection module is a module containing a scintillator and MPPC designed to detect gamma rays from 137Cs (Cesium-137) and the like. The scintillator converts incident gamma rays into visible light, and the MPPC detects the light down to extremely low light levels to measure low-energy gamma rays with high accuracy. The signal processing circuit and A/D converter are housed in a compact case. The modules provide a USB or RS-232C interface. The products include sample software with functions for setting measurement conditions, acquiring and saving date, and drawing graphs, etc.

Radiation detection module C12137 series

Detection of low-energy gamma rays and energy discrimination



Measurement example C12137
Note: PC not included with C12137

The C12137 series is capable of acquiring an energy spectrum as well as providing accurate energy discrimination. 137Cs is known to decay while emitting gamma rays at energies around 662 keV and around 32 keV. Acquiring an energy spectrum down to low energy gamma rays around 30 keV allows determining whether those gamma rays are derived from 137Cs. When the energy of gamma rays entering a scintillator falls to a low level, the light level emitted from the scintillator in response to the gamma rays is also very low. The C12137 series uses a high sensitivity MPPC that allows detecting gamma rays over a wide range.

Easy assembly into equipment


Schematic cross section (C12137-01)

This radiation detector module contains a scintillator, photosensor (MPPC), signal processing circuit, and interface circuit, all integrated into a compact package that can be easily assembled into portable measuring devices and inline measurement devices. The MPPC serving as the photosensor in the C12137 series is small and has a thin profile, so it takes up only a small share of the available space. The scintillator, on the other hand, takes up the main share of space. This means that high detection efficiency is achieved even in this small radiation detector module.

The compactness of this radiation detector module is advantageous in applications such as inspections of food stuffs, beverages, and marine products where the radiation from objects under measurement is extremely low. This is because such applications usually require covering the peripheral area of the radiation detector with lead in order to eliminate effects from environmental background radiation. However, the C12137 series radiation detector module is small, so the amount of lead needed for shielding can be reduced which in turn makes the equipment smaller and lighter.


Sample software


Sample software (for Windows)

Hamamatsu also provides sample software for initial evaluation of our radiation detector modules. Basic sample software functions are setting measurement parameters, acquiring and saving data, and displaying measurement data graphs.* To help users develop their own application software for operating our radiation detector module while installed into equipment, we also provide function specifications and source codes of the sample software.

* Displaying measurement data graphs: USB type only



A total of eight types in four different sizes and two interfaces (USB and RS-232C) are available that you can choose from according to your application. The characteristics are the same between the USB type and RS-232C type (the software specifications are different).




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