C12137 查看數據表（PDF） - Hamamatsu Photonics
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C12137 Datasheet PDF : 9 Pages
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Radiation detection modules
C12137 series
Radiation detection modules incorporating a compact and high-gain MPPC offer the following features:
01 Feature
Detection of low energy gamma rays (down to 30 keV)*4 and energy discrimination
The C12137 series can acquire energy spectra and therefore can perform energy discrimination. 137Cs is known to decay while emitting gamma rays
at energies around 662 keV and 32 keV. The C12137/-01 can determine whether gamma rays is from 137Cs by acquiring the energy spectrum from
the low-energy gamma rays at around 30 keV. As the gamma rays become lower in energy, the level of light emitted by the scintillator weakens.
However, the Radiation detection module, which uses a high sensitivity MPPC, is able to detect gamma rays over a wide range from low-energy
gamma rays around 30 keV up to about 2 MeV.*5
The low-light-level detection performance of high gain MPPCs also contributes greatly to reducing the measurement time. To reduce the mea-
surement time, the scintillator capacity must be increased to improve the detection efficiency. However, as the scintillator capacity is increased,
the level of light that reaches the photosensor is attenuated inside the scintillator, and the lower limit of detection degrades accordingly. This
makes it more difficult to detect low energy gamma rays. The MPPC offers higher gain than the PIN photodiode or APD and makes low-light-
level detection possible. Even when it is combined with a large capacity scintillator, low-energy gamma rays can still be measured.
*4: The lower limit of the energy range of the C12137-08/-10 is 60 keV.
*5: C12137/-01
02 Feature
Easy integration in devices
Since the radiation detection module includes a scintillator, photosensor
(MPPC), signal processing circuit, interface circuit, and the like in a small
case, it can easily be incorporated into portable measuring instruments
and in-line measuring instruments.
In the C12137 series, the photosensor MPPC is a small, thin type. The MPPC
takes up a small portion of the entire space: the space is predominantly is
taken up by the scintillator. This shows that even though the radiation
detection module is small, it can provide high photon detection efficiency.
Because the radiation detection module is compact, it is advantageous in
applications where the radiation dose from the object under measurement
is minute. Such applications include inspection of food and beverages. In
these types of applications, the periphery of the detector must be covered
with lead to eliminate the effects of environmental radiation. Because the
radiation detection module is compact, the amount of used lead can be
reduced, which in turn reduces the volume and weight of the entire device.
Cross-sectional schematic (C12137-01)
Scintillator
Signal processing circuit,
interface circuit
KACCC0646EA
03 Feature
Superb temperature stability
The level of emitted light by the scintillator due to in-
cident gamma rays and the photosensor sensitivity are
temperature dependent. This temperature dependence
causes a shift in the detected energy when the ambient
temperature changes even when gamma rays with the
same energy are incident and ultimately causes mea-
surement errors and interferes with radionuclide iden-
tification. The gamma ray detector unit of the C12137
series employs a structure with high temperature stabil-
ity as well as a temperature-compensation circuit, which
exhibits excellent temperature stability even when the
temperature changes drastically. The graph below il-
lustrates the detected energy shift of the C12137 in re-
sponse to ambient temperature changes. The tempera-
ture stability is ±5% max. in the ambient temperature
range of 0 to +50 °C.
Ambient temperature and detected energy shift (C12137)
60
4
Ambient temperature
Detected energy shift
50
3
40
2
30
1
20
0
10
-1
0
-2
-10
0
-3
200
400
600
800 1000 1200 1400
Time (min)
KACCB0273EA
3
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