1 Scope
This part specifies the occupational exposure limits of physical agents in the workplace.
This part is applicable to every kind of workplace where physical agents exist or are generated. It is applicable to the health condition of the workplace, labor condition, the degree of labor contacting physical agents, leakage of production plant, monitoring, assessment, management of the effect of protective measures, supervision of health design of industrial enterprise and occupational health.
This part is not applicable unprofessional contact.
2 Normative References
The following standards contain provisions which, through reference in this part, constitute provisions of this part. For dated references, all subsequent modification or revision (excluding correction contents) are not applicable to this Part. However, all concerned Parties are encouraged to study if the latest editions of these documents can be applied. For undated references, the latest editions of the normative documents are applicable to this part.
GBZ 1 “Hygienic Standards for the Design of Industrial Enterprises”
GBZ 2.1 “Occupational Exposure Limit for Hazardous Agents in the Workplace—Chemical Agents”
GB/T 3947 “Acoustical Terminology”
GBZ/T 189.1 “Measurement of Physical Agents in Workplace—Part 1: Ultra High Frequency Radiation”
GBZ/T 189.2 “Measurement of Physical Agents in Workplace—Part 2: High Frequency Elec- tromagnetic Field”
GBZ/T 189.3 “Measurement of Physical Agents in Workplace—Part 3: Power Frequency Electric Field”
GBZ/T 189.4 “Measurement of Physical Agents in Workplace—Part 4: Laser Radiation”
GBZ/T 189.5 “Measurement of Physical Agents in Workplace—Part 5: Microwave Radiation”
GBZ/T 189.6 “Measurement of Physical Agents in Workplace—Part 6: Ultraviolet Radiation”
GBZ/T 189.7 “Measurement of Physical Agents in Workplace—Part 7: Heat Stress”
GBZ/T 189.8 “Measurement of Physical Agents in Workplace—Part 8: Noise”
GBZ/T 189.9 “Measurement of Physical Agents in Workplace—Part 9: Hand-transmitted Vibration”
GB/ZT 189.10 “Measurement of Physical Agents in Workplace—Part 10: Classification of Physical Workload”
GBZ/T 189.11 “Measurement of Physical Agents in Workplace—Part 11: Heart Rate on Physical Work”
3 Terms and Definitions
Terms and definitions specified in 3.1, 3.3 and 3.4 of GBZ 2.1 are applicable to this part.
4 Occupational Exposure Limits for Laser Radiation in the Workplace
4.1 Terms and Definitions
4.1.1 Ultra high frequency radiation
It is also known as ultra-short wave, which is electromagnetic radiation with a frequency of 30MHz~3.0MHz or a wave length of 10m~1m, including pulse wave and continuous wave.
4.1.2 Pulse wave
It is an ultra high frequency radiation produced by impulse modulation.
4.1.3 Continuous wave
It is an ultra high frequency radiation produced by continuous vibration.
4.1.4 Power density
It is the radiated power of a unit area and represented by P and the unit is mW/cm2.
4.2 Health Requirements
See Table 1 for occupational exposure limits for ultra high frequency radiation in one working day.
