The standard electret ion chamber can be modified to include a thin window that allows alpha particles to enter the sensitive volume, thus becoming an alpha monitor. One standard version has a depth of 2.8 cm, diameter of 8 cm with window made of aluminized Mylar of thickness 0.8 mg/cm2. Detailed work was carried out on the topic of "Utilization of Electret Ion Chambers for Characterization of Gross Alpha Emission from Indoor Surfaces" under a CRADA (Cooperative Research and Development Agreement) program between Rad Elec Inc. and Oak Ridge National laboratory. This has been published in 1993 USDOE Methods Compendium Protocol and is available on request. It is usable for routine alpha survey of alpha contaminated surfaces such as concrete, wood, vinyl floors or painted surfaces with sensitivity requirement of DOE clearance limit. Versions with larger volume are also available. These can be used with or without window. Following publications are available for further details: