GB/T 5202-2008 in English

《GB/T 5202-2008辐射防护仪器　α、β和α／β（β能量大于60keV）污染测量仪与监测仪》由TC30（全国核仪器仪表标准化技术委员会）归口，TC30SC3（全国核仪器仪表标准化技术委员会辐射防护仪器分会）执行，主管部门为国家标准化管理委员会。
本标准规定了直接测量或直接探测发射α和／或β核素的表面污染测量仪与监测仪的一般特性、一般试验条件、辐射特性、电气安全、环境特性等。本标准适用于直接测量或直接探测发射α和／或β核素的表面污染测量仪和监测仪。本标准等同采用ＩＥＣ６０３２５：２００２《辐射防护仪器　α、β和α／β（β能量＞６０ｋｅＶ）污染测量仪和监测仪》（英文版）。 本标准代替ＧＢ／Ｔ５２０２―１９８５《α、β和α?β表面污染测量仪与监测仪》。
本标准与ＧＢ／Ｔ５２０２―１９８５相比主要变化如下：
ａ）　标准名称改为《辐射防护仪器　α、β和α／β（β能量大于６０ｋｅＶ）污染测量仪与监测仪》；
ｂ）　增加了“仪器分类”一章；
ｃ）　在“环境影响”一章中增加了“电磁兼容性”的内容，包括对“静电放电”、“射频电磁场”、“由脉冲
群和射频感应的传导骚扰”、“浪涌”、“电压暂降和短时中断”和“辐射发射”的要求和试验方法。

1 Scope

This standard is applicable to directly measure or directly detect surface contamination meters and monitors for emitting α and/or β nuclide, at least including:
——Detection assembly (including counting tube, scintillation detector or semiconductor detector), which may be of fixed connection or flexible cable connection or compose one separate device;
——Measurement assembly.
Some meters and monitors are composed of detection assembly and measurement assembly, and the detection assembly may be separately used when the detection assembly can be separated with instrument. In order to meet this standard, all instruments including detection assembly and measurement assembly shall meet the requirements of this standard, or the detection assembly and measurement assembly shall respectively meet the requirements of relevant parts of this standard.
Note: If a kind of application mode meets the requirements of this standard through certification after correspondence, the combination assembly of other special instruments can not be deduced meeting the standard. For the latter application mode, the assembly produced by different manufacturers may be allowed for combination assembly by the user.
This standard is applicable to:
——Alpha surface contamination meter;
——Alpha surface contamination monitor;
——Beta surface contamination meters
——Beta surface contamination monitor
——Alpha/beta surface contamination meter;
——Alpha/beta surface contamination monitor;
The latter two equipments are able to simultaneously determine alpha and beta contamination and respectively display measuring result:
——Alpha (beta, alpha/beta) surface contamination meter: including one or more radiation detectors and relevant assembly or basic function unit. When checking surface contamination, it is used for measuring alpha (beta, alpha/beta) surface emission rate;
——Alpha (beta, alpha/beta) surface contamination monitor.
This standard is also applicable to those instruments for special purposes and instruments designed for measuring special property surface. But some requirements of the standard are required to be modified or supplemented according to the special requirements of these instruments.
If one instrument is able to realize diversified functions, the instrument is required to meet all requirements of these different functions. If the instrument has one major function and is accompanied with other functions, the instrument is required to meet all requirements of major function and meet the requirements of other functions as much as possible.
This standard is not applicable to radiation monitor or meter for measuring or detecting beta particle with maximum energy less than 60keV.
This standard is aimed to specify standard requirements and provide some examples of applicable methods, and also specify general characteristic, general test condition and method, radiation characteristic, electric safety, environment characteristic and quality certificate of alpha, beta and alpha/beta contamination meters and monitors.

Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Units
5 Instrument Classification
6 General Characteristic
6.1 Detection Assembly
6.2 Ease of Decontamination
6.3 Sealing
6.4 Alarm Threshold
6.5 Instrument Indication Value
6.6 Effective Range of Measurement
6.7 Display
6.8 Mechanical Shock
6.9 Adjustment and Maintenance Accessories of Electronic Device
7 General Test Methods
7.1 Test
7.2 Overview
7.3 Background
7.4 Statistical Fluctuation
8 Electrical Characteristic
8.1 Statistical Fluctuation
8.2 Response Time
8.3 Relation between Response Time and Statistical Fluctuation
8.4 Alarm Threshold Drifting
8.5 Preheating Time Test of (Portable Instrument)
8.6 Resolving Time
8.7 Overload Protection
8.8 Working Floor (Only for Detector)
8.9 Threshold (Only for Detector)
9 Radiation Characteristic
9.1 Overview
9.2 Instrument Efficiency
9.3 Response Change of Detector Surface
9.4 Relative Intrinsic Error
9.5 Surface Emission Rate Response Changes with Radiation Energy
9.6 Response for Other Ionizing Radiation
9.7 Background Counting Rate
10 Environment Impact
10.1 Environment Temperature
10.2 Relative Humidity
10.3 Power Supply
10.4 Electromagnetic Compatibility
11 Storage
12 Documents
12.1 Quality Certificate
Table 1 Reference Conditions and Standard Test Conditions
Table 2 Test in Standard Test Conditions
Table 3 Tests Performed with Variation of Influence Quantities