The nucleus loses an alpha particle, which takes two protons and two neutrons out of the nucleus. This reduces the isotope number by four, and the atomic number by two. An exa â¦ mple is the alpha decay of thorium-232 (atomic number 90) to radium-228 (atomic number 88).
A raze permit is authorization for complete demolition of a building or structure. A raze permit may also be required if most of a building is to be demolished. HPO clearance of raze applications safeguards against demolition of historic properties by accident or without proper public notice.
Radon mitigation is any process or system used to reduce radon concentrations in the breathing zones of occupied buildings. The goal of a radon mitigation system is to reduce the indoor radon levels to below the EPA action level of 4 pCi/L. Slab-On-Grade: Slabs built on grade can have many openings that allow radon to enter, just as in a basement. 2  Crawl Space: Homes with crawl spaces can also have elevated radon levels. 3  The vacuum effect can draw radon gas from a crawl space into the home.