Abstract
The current methods employed by detector tube manufacturers to report sampling limitations imposed by ambient humidity conditions may be confusing and sometimes misleading to the user. Absolute humidity limits (mg/L of water) are inconvenient to use and are often ignored, even though they frequently impose surprisingly restrictive sampling conditions. A short microcomputer program to convert absolute humidity limits into temperature-dependent relative humidity limits is presented. Temperature-independent relative humidity limits are easier to use but the scientific basis of such limits is questionable. Several recommendations are presented for improving the usefulness and reliability of detector tube humidity limits.