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Radiation detection modules : C12137

E-mail contact

+886-2-8772-8910

Features

●Gamma ray energy discrimination

●Modular design for easy integration into devices

●Compact and lightweight

 
Applications

●Environmental monitoring and mapping

●Screening such as incoming and outgoing inspections at manufacturing sites

●Incorporation into portable, high-sensitivity detectors

 

Lineup

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 specifi cations are different).

 

 

 

 

 

 

 

 

Structure
◎USB type

Parameter

C12137

C12137-01

C12137-08

C12137-10

Unit

Dimensions (W × D × H)

110 × 55 × 27

71 × 55 × 60.5

112 × 94 × 53.3

122 × 122 × 53.3

mm

Weight

120

320

1130

1570

g

Detector

MPPC

-

Scintillator

CsI (Tl)

-

Scintillator size (W × D × H)

13 × 13 × 20

38 × 38 × 25

80 × 80 × 25

ɸ110 × 25

mm

Sampling time

1 to 60 s, adjustable

-

Interface

USB 2.0 (Full Speed)

-

Compatible OS

Windows 7 SP1 (32-bit, 64-bit)

-

Power supply

USB bus power (150 mA typ., 500 mA max.)

-

 

◎RS-232C type

Parameter

C12137-00D

C12137-01D

C12137-08D

C12137-10D

Unit

Dimensions (W × D × H)*1

110 × 55 × 27

71 × 55 × 60.5

112 × 94 × 55.6

122 × 122 × 55.6

mm

Weight

160

360

1170

1610

g

Detector

MPPC

-

Scintillator

CsI(Tl)

-

Scintillator size (W × D × H)

13 × 13 × 20

38 × 38 × 25

80 × 80 × 25

ɸ110 × 25

mm

Sampling time

1 to 60 s, adjustable

-

Interface

RS-232C (EIA-232-E)

-

Bit rate

115200

bps

Power supply

+5 V (200 mA typ., 500 mA max.)

-

*1: Excluding the cable and connector

 

Absolute maximum ratings

Parameter

C12137/-00D

C12137-01/-01D

C12137-08/-08D

C12137-10/-10D

Unit

Operating temperature

-10 to +50

0 to +40

°C

Storage temperature

-20 to +50

-10 to +50

°C

Note:
Exceeding the absolute maximum ratings even momentarily may cause a drop in product quality. Always be sure to use the product within the absolute maximum ratings.
 
Electrical and optical characteristics (Typ. unless otherwise noted)

Parameter

Condition

C12137/-00D

C12137-01/-01D

C12137-08/-08D

C12137-10/-10D

Unit

Counting efficiency min.

137Cs, 0.01 μSv/h

40

400

2000

cpm

Energy range

 

0.03 to 2

0.06 to 2

MeV

Energy resolution

137Cs, 662 keV

8

8.5

9

10

%

Measurement range
(dose equivalent rate)

137Cs, 662 keV*2
The lower limit depends on the environmental radiation.

0.01 to 100

0.001 to 10

*3

μSv/h

Measurement error

Excludes attenuation (caused by the shield) and counting fluctuations

±20

*3

%

*2: Measurement range of these products is defined by 137Cs. When detecting environmental radiation that mainly consists of low energy radiation, the maximum measurement value will be approx. 1/3 to 1/2 of this fi gure.
*3: C12137-08/-08D/-10/-10D do not perform conversion into dose equivalent rate using the G(E) function.
 
Block diagram (C12137)
 
Radiation detection modules incorporating a compact and high-gain MPPC offer the following features:
 
Feature 01 
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 measurement time, the scintillator capacity must be increased to improve the detection effi ciency. 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 diffi cult to detect low energy gamma rays. The MPPC offers higher gain than the PIN photodiode or APD and makes low-lightlevel 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
 
Feature 02
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.
 
Feature 03
Superb temperature stability
The level of emitted light by the scintillator due to incident 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 measurement errors and interferes with radionuclide identification.
The gamma ray detector unit of the C12137 series employs a structure with high temperature stability as well as a temperature-compensation circuit, which exhibits excellent temperature stability even when the temperature changes drastically. The graph below illustrates
the detected energy shift of the C12137 in response to ambient temperature changes. The temperature stability is ±5% max. in the ambient temperature range of 0 to +50 °C.
 
Sample software
The C12137 series comes with sample evaluation software for inifi al evaluation.
The software provides basic functions for setting measurement conditions, acquiring and saving data, and drawing graphs*5, etc. To help you develop your own application software for operating the radiation detection module integrated in your equipment, function specifi cations and sample software source code are also provided.
*5: A1 USB type

 

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