How it - The 3-12 month Alpha Track radon test kit is a diffusion-based track detector. The flowing better design out dust and radon progeny through a morphological filter that is an computation part of the housing, resulting in increased sturdiness. The housing is wrought from electrically conducting impressible in order to minimize electric charge effects from the positively charged radon progeny generated at heart the detector. The subfigure base is to maximize sensitivity and create a more provide track distribution for better counting statistics. The track detector foil at heart the housing from dosimetry-grade CR-39 cast specifically for our Laboratory. The sheets of CR-39 are laser and engraved with a single batch number. Each batch is and receives its have calibration factor. All sheets are also for background tracks. Accustar Labs the alone 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 fighter to chemically carved alpha track radon testing. All test kit foils are using a computer-aided image analysis system. closed in house conditions are not during a longsighted term test. the test device exposed for 91 days to 12 months under pattern living conditions. Becasue of this single and exact 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 ample refund. The U.S. EPA has this product for exact radon measurement. NELAP, NEHA & NRPP.