II 五 、 技 术 参 数 Page31

六、保修

德国柯雷技术有限公司保证它制造的每一个仪表在材料和工艺上没有缺陷。

所有产品在运送给原始消费者后保修一年。

德国柯雷技术有限公司保留在任何时间改变设计的权利。

此中文使用手册由德国柯雷技术有限公司翻译并提供。

II 七 、 附 录

七、附录

单位转换公式 

UNITS OF RADIATION MEASUREMENT

The curie is the number of particles per second from 1 gram of Radium = 3.7 x 10 E10 counts/second = 37 billion cps = 37 billion Becquerel.

1 Becquerel (Bq) = 1 count per second = 1 event per second

1 microcurie = 1 uCi = 37,000 Bq = 37,000 cps.

1 microcurie = 2.22 x 10E6 disintegrations / minute = 2,220,000 cpm.

1 nanocurie = 1 billionth of a curie = 2,220 disintegrations / minute.

1 picocurie = 2.2 disintegrations / min.

Dosage units:

Gray (Gy) = 1 Joule/kg

Sievert (Sv) = Gray x QF, where QF is a "quality factor" based on the type

of particle. The Sievert is a measure of biological effect.

QF for electrons, positrons, and xrays = 1 QF = 3 to 10 for neutrons,

protons dependent upon the energy transferred by these heavier particles.

QF = 20 for alpha particles and fission fragments.

Converting older units:

1 rad = 1 centigray = 10 milligrays ( 1 rad = 1cGy = 10 mGy )

1 rem = 1 centisievert = 10 millisieverts ( 1 rem = 1cSv = 10 mSv )

1 mrad = 10 μGy

Nominal background radiation absorbed dose of 100 mrad/year = 1 mGy/yr.

Nominal background radiation dose biological equivalent of 1mrem/year = 10μSv/yr.

Occupational whole body limit is 5 rem/yr = 50 μsv/yr. ( Recently proposed that levels be reduced to 2 rem/yr.)

2.5 mrem/hr or 25 μSv/hr is maximum average working level in industry.

Exposure rate from Naturally Occurring Radioactive Material (NORM) ; an

empirically derived conversion factor for Ra-226 decay series: 1.82 microR/hour = 1 picoCurie/gram.

mR/h=10μSv/h

mR=10μSv