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 Release 22.0, Sept. 2008
 
The Medical Algorithms Project
Chapter : ch33. Environmental Toxicology Section : Threshold Limit Values (TLV) for Chemical Exposure
  Excursion Factor for Maximum Short Term Chemical Exposure

  Online Excel Reference
Copyright (c) 2008-2010, Institute for Algorithmic Medicine, Houston, TX, USA. All rights reserved.

Overview :

If a ceiling limit is not assigned for a chemical exposure, then a limit value can be calculated using the excursion factor based on the threshold limit value (TLV),

 

TLV in ppm

Excursion Factor

0 - 1

3

1 - 10

2

10 - 100

1.5

100 - 1000

1.25

 

maximum concentration permitted for a short exposure =

= (TLV in ppm) * (excursion factor)

 

  References:

Walker TJ. Chapter 2: Recognition and evaluation of hazards. pages 10-32 (30-31). IN: Proctor NH, Hughes JP. Chemical Hazards in the Workplace. JB Lippincott. 1978.

 

 
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