How it - The 3-12 month Alpha Track radon test kit is a diffusion-based track detector. The topical developed design out dust and radon progeny through a functional filter that is an entire part of the housing, resulting in increased sturdiness. The housing is wrought from electrically conducting elastic in order to minimize electric charge effects from the positively charged radon progeny generated interior the detector. The subfigure base is to maximize sensitivity and create a more regular track distribution for better counting statistics. The track detector foil interior the housing from dosimetry-grade CR-39 cast specifically for our Laboratory. The sheets of CR-39 are laser and engraved with a incomparable batch number. Each batch is and receives its personal calibration factor. All sheets are also for background tracks. Accustar Labs the simply Radon Testing Lab in the United States to use chemistry etching to process its alpha track foils which are subsequently counted with computer-aided image analysis equipment. This kind of system was arch to chemically incised alpha track radon testing. All test kit foils are using a computer-aided image analysis system. shut house conditions are not during a extended term test. the test device exposed for 91 days to 12 months under natural living conditions. Becasue of this incomparable and true testing process, please up to 10 business days -LRB- after the Lab receives your kit -RRB- to obtain results. : ALL SALES ARE FINAL. No returns will be for these lab test kits. for any reason the lab test is not conducted within 2 weeks, you will receive a riddled refund. The U.S. EPA has this product for true radon measurement. NELAP, NEHA & NRPP.