Long Term Alpha Track Radon Detector Kit (Can NOT sell to New Jersey Addresses) An easy radon test you can use yourself. Testing periods from 8 days to 1 year. The US EPA defines long term as 91 days or longer. Includes test, complete instructions, analysis, prepaid shipping and return postage in the US. (If your test is for 8-14 days, your detector must be returned to RSSIs lab by overnight service to minimize exposure during transit.) A report will be sent to you by email or mail, and the result will be available online. The report will have a link to the US EPA radon page and the phone number for your state radon program. RSSI is NRPP and NRSB certified and state licensed.