ชื่อเรื่อง : AIR QUALITY — PARTICLE SIZE FRACTION DEFINITIONS FOR HEALTH-RELATED SAMPLING
หมายเลขมาตรฐาน : ISO 7708:1995
ชื่อหน่วยงาน : International Organization for Standardization (ISO)
ขอบข่าย :
This International Standard defines sampling conventions for particle size fractions for use in assessing possible health effects of airborne particles in the workplace and ambient environment. Conventions are defined for the inhalable, thoracic and respirable fractions; extrathoracic and tracheobronchial conventions may be calculated from the defined conventions. (The inhalable fraction is sometimes called inspirable — the terms are equivalent. The nomenclature of the fractions is discussed in annex A.) Assumptions are given in clause 4. The convention chosen will depend on the region of effect of the component of interest in the airborne particles (see clause 3). In this International Standard, conventions are expressed in terms of mass fractions, but they may also be used when the intention is to evaluate the total surface area or the number of particles in the collected material. The conventions should not be used in association with limit values defined in other terms, for example for limit values of fibres defined in terms of their length and diameter.
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