神马影院推理片免费在线看安全吗_深爱激情五月婷婷_中文字幕丝袜诱惑_亚洲区欧美区_国产一区二区女内射_暖暖的免费观看视频日本_成人乱码一区二区三区AV0_免费视频99只有精品视频_亚瑟中文 在线_99久久久国产精品免费蜜臀_无码中文欧美一区二区三_老司机在线免费观看视频_欧美性潮喷XXXXX免费视频看_毛片在线网址_婷婷亚洲图片_国产乱妇乱子在线播视频播放网站_老司机免费看视频_女人和拘做受全过程免费_啦啦啦手机视频高清观看免费_色香蕉色香蕉在线视频

LB-2 Low Background α/β The measuring instrument is mainly used for the low level total of various substances α、 total β An accurate measurement of specific activity of radioactivity. Used for environmental protection, detecting radioactivity in water, air, soil, and buildings; Used for health and epidemic prevention, and for detecting radioactivity in drinking water, food, vegetables, milk, and dairy products; Used for inspection of building materials, radioactive inspection of granite, marble, sand, cinder brick, slag brick, etc; Used for monitoring emissions, atmosphere, and environment from nuclear power and other nuclear facilities; Other applications include radiation protection, health physics, biomedical research, agronomy, archaeology, and geology.


Technical indicators


1. There are two independent low background αβ The main detector can simultaneously measure two samples, giving the total of the two samples α、 total β Activity concentration measurement is characterized by high sensitivity, low background, simple structure, convenient, stable, and reliable operation.


two β Source (active region Φ When the 2 π detection efficiency ratio of 20mm is ≥ 60%, the background count rate per unit area is ≤ 0.10cm-2min-1.

three α Source (active region Φ When the 2 π efficiency ratio is ≥ 85%,

Background count rate per unit area ≤ 0.002cm-2min-1.

4. String ratio: α get into β Channel ≤ 1%, β get into α Trace ≤ 0.1%.

5. Efficiency stability: α＜ 2%， β＜ 3%。

6. Instrument sensitivity: α= five × 10-4Bq； β= one × 10-3Bq。

7. Repeatability: When the instrument is continuously powered on for 24 hours, the efficiency of each detector changes by<± 5%.

8. Insulation resistance ≥ 2M Ω, withstand voltage insulation degree ＞ 1500V.

9. The ambient temperature for use is 5-40 ℃, and the relative humidity is<90%.

10. Power supply: AC 220V ± 10%, 50HZ, power consumption ≤ 20W. http://www.www.x42wfg.com