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Answer to Question #5701 Submitted to "Ask the Experts"Category: Radon The following question was answered by an expert in the appropriate field: Q
I am trying to find a commercial source for an air-sampling device called a diffusion screen or diffusion battery. They have been used to sample radon and other isotopes attached to ultrafine particles. A
The effectiveness of radon decay products to deliver dose to lung tissues depends on the size of the decay product. Shortly after they are created, these particles are quite small (~1 nm) and highly mobile. As they age they may aggregate with more atoms from the air and attach themselves to an existing aerosol, growing to as much as 1,000 nm in size. Diffusion battery devices separate radon decay products into size fractions using differential mobility to capture the higher-mobility particles. Often these devices draw the air sample through one or more fine mesh screens that precede a "collect-all" filter.
Commercially available examples of devices that separate the highly mobile nanoparticles from the rest are the SARAD EQF3120, a continuous sampling electronic monitor, and the Rad Elec E-RIPSU, an integrating monitor.
Answer posted on 28 August 2006. The information and material posted on this Web site is intended as general reference information only. Specific facts and circumstances may alter the concepts and applications of materials and information described herein. The information provided is not a substitute for professional advice and should not be relied upon in the absence of such professional advice specific to whatever facts and circumstances are presented in any given situation. Answers are correct at the time they are posted on the Web site. Be advised that over time, some requirements could change, new data could be made available, or Internet links could change. For answers that have been posted for several months or longer, please check the current status of the posted information prior to using the responses for specific applications.
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