radon gas and monsanto 
 on a side note: Why is Monsanto conducting a study?  A Concerned Corporation? 

http://www.sdhdidaho.org/hpro/slag.php 

How do I find out if I have a problem with radiation from slag?

Residents throughout Southeast Idaho are invited to participate in a voluntary program conducted jointly by the District Health Department, FMC, Monsanto, and EPA. The program helps residents find out if phosphorus slag in their homes and business properties is causing unacceptably high exposure to radiation. In the past, slag has been used in roofs, basement foundations, sidewalks and driveways.


  
Could there be a connection?
Radon is a naturally occurring radioactive gas. It is produced in the ground through the normal decay of uranium and radium. Dig up the top 6 feet of an acre of land and you will find, on average, about 50 pounds of uranium. Uranium decays to radium, which then decays to radon.

What Makes Radon Dangerous?

Radon itself is an inert gas & poses no danger, but radon decays to polonium & lead particles. These and later progeny are chemically very active as well as radioactive. When you breathe, these radioactive progeny lodge in your lungs, bronchi, and trachea. The radiation disrupts and mutates cells and can, eventually, result in lung cancer. Radon is estimated to be the second leading cause of lung cancer in the United States. It is a potential problem in every state. Its health risk increases with the length of exposure and concentration level of the radon.

How Does Radon Get Into Homes?

Radon moves through small spaces in the soil and rock on which a house is built and can seep into a home through dirt floors, floor drains, sump pits, cracks in the foundation and basement floor & up through hollow core block foundation walls. Differences in air pressure between the basement and the soil beneath the home also play a part in the migration of radon gas.

 

The EPA has set the level of concern at 4 picoCuries of radon per liter of air (4 pCi/L). This is a concentration of 70,000 atoms of radon in each liter of air (about 2 million radon atoms in every cubic foot of air). This is a very low concentration, roughly one radon atom in a billion-billion air atoms, however, the radon atoms are radioactive and that makes the difference. We breathe about 20 liters of air into our lungs each minute. At 4 pCi/L we accumulate about 10,000 radioactive atoms in our lungs, trachea, and bronchi every minute.