Here are some images of the Minnesota Radon Project's alpha track detector listings in the National Radon Measurement Proficiency Program along with the most recent calibrations tests now that the NRMP is dead.
Model notes:
Model A--used from 1983 to 1999 in a study of year-to-year radon variation
Model R- used from 1990-present
Model S- used from 2000 to present


Model A= Participant no. 66
Model R= Participant no. 68
Model S= Participant no. 73


Questions/Comments, e-mail: Dr. Steck
Last revised : 30 June, 2004
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