Ⅰ. Product Introduction

TK-101 high purity germanium measurement system is the first domestic set of high-performance gamma-ray spectrometric system, providing an integral solution which consists of the high purity germanium detector, the refrigeration device, the digital multi-channel spectrometer, the low background radiation lead chamber, the gamma spectrum access and analysis software, the sourceless efficiency calibration software and so on. TK-101 integrates a number of patented technologies of Beijing Tai Kun Industrial Equipment Co.,Ltd.., with advantages of high energy resolution, highly automated radioactivity analysis, high system stability, high analysis result reliability, efficiency calibration without standard sources, complete operation in Chinese and so on. It is suitable for use by radioactive spectrum analysis professionals and non-professionals.

Ⅱ.Technical Specifications

1.1 High purity germanium detector

Model：Gamma-1

P-type coaxial detector, P-type wide energy range coaxial detector, N-type coaxial detector and well-type detector are optional; for typical detector indicators, please see Tables 1 and 2.

Table 1 Indicators of p-type coaxial (wide energy range) high purity germanium detector configured with TK-101

Table 2 Indicators of well-type high purity germanium detector configured with TK-101

Table 3 Indicators of N-type high purity germanium detector configured with TK-101

1.2 Digital multi-channel

 Model：Gamma-2

TK-101 is equipped with digital multi-channel 2 Gamma-2 with up to 16384 channels, developed by Beijing Tai Kun Industrial Equipment Co.,Ltd..; the multi-channels use military-grade electronic components, with stable and reliable performance. The appearance of 2 Gamma-2 multi-channel is shown in Figure 2, with Technical Specifications as follows:

l  Maximum data passing rate: greater than 100kcps;

l  Coarse adjustment gain: 1,2,4,8,16 or 32 optional;

l  Fine adjustment gain: 0.45 ~ 1 adjustable;

l  Largest channel address: 16384;

l  shaping time constant: rise time is adjusted from 0.8μs to 23μs, with 0.2μs per step; flat-top time is ranged from 0.3μs to 2.4μs, with 0.1μs per step, selected by the computer (automatically adjusted under most automatic optimization function);

l  Linearity: integral nonlinearity ≤ ± 0.025%; differential nonlinearity ≤ ± 1%;

l  Temperature coefficient: gain <35ppm / ° C; zero point <3ppm / ° C;

l  Overload recovery: 1000 times overload is recovered to within 2% rated output within 2.5 times non-overload pulse width at maximum gain;

l  Pulse anti-accumulation: with field value set automatically, the resolution of pulse pairs is 500ns;

l  Signal processing: with digital spectrum stabilization, automatic pole-zero, digital gating baseline recovery and other functions;

l  Data memory: 16384-channel non-volatile memory, with 2³¹-1 counts capacity per channel;

l  Memory segmentation (system conversion gain): 16384, 8192, 4096, 2048, 1024 or 512 channels selected by the computer,

l  Digital spectrum stabilization: gain and zero point are controlled and stabilized by the computer;

l  Automatic digital pore-zero adjustment: controlled by the computer, with manual or automatic setting;

l  Count rate display: displayed on the computer screen in real time;

l  Dead time correction: accuracy (changed with peak area) <3% (0 ~ 50000cps);

l  Communication interface: USB2.0;

l  single-channel or twin channel: to provide a single MCA and dual MCA options;

l  Dimensions : 252mm × 150mm × 50mm;

l  Weight: 1kg;

l  Operating temperature: -10 ~ 50 ℃。

1.3、Liquid Nitrogen Re-condensing Refrigerator

Model：Gamma-3

Ⅰ. Product Introduction

GAMMA-3 liquid nitrogen re-condensing refrigerator is developed by Beijing Tai Kun Industrial Equipment Co.,Ltd. after three years of research and development (shown in Figure 1); the product uses micro-electric refrigerator as the main working part, with ultra-low temperature refrigeration able to transform gaseous nitrogen in the Dewar bottle back to the liquid state, and maintain a long-term liquid nitrogen level. Thereby the labor for frequent addition of liquid nitrogen is avoided to save manpower costs. Also, compared with the electric refrigerator, as refrigeration unit of the liquid nitrogen re-condensing refrigerator does not touch with the liquid nitrogen, without the deterioration to the resolution of the detector, reaching the resolution level of the conventional liquid nitrogen refrigeration, and in case of power failure the low temperature environment is maintained by reliable liquid nitrogen, thereby better protecting the continuity of the system work.

Ⅱ. Technical Specifications

l  The service life is not less than 200,000 hours;

l  With LED display, to display the remaining liquid nitrogen volume in real time;

l  With a safety relief valve, to prevent risks due to high pressure in case of power failure of equipment itself;

l  Unnecessary to add liquid nitrogen for nearly 24 months under the continuous power supply conditions;

l  When the 30L liquid nitrogen storage tank is filled with liquid nitrogen, the detector can maintain the low temperature state in case of power failure, with liquid nitrogen supplied for more than seven days;

l  Electric pulse tube cooling (Stirling electric refrigerator optional);

l  With a numerical display mode: refrigeration time and liquid nitrogen level can be maintained at the refrigeration state, and an alarm can be issued when the refrigeration time remains less than 48 hours;

l  Motor is used to collect the evaporated nitrogen and to compress them back to the liquid state;

l  The average power consumption is less than 200W.

Ⅲ. Applications

l  As the supporting part for high purity germanium detector, and also for other scientific instruments working in the liquid nitrogen temperature zone.