Gamma radiation due to Radium-226 contamination in the soil is not shielded and is a source of direct exposure to high levels of radiation.
radon is different
gamma radiation and radon are both due to Contamination with radium-226 but...
Radon is not gamma
Radon is a gas
Radon can be absent, despite high levels of Radium-226 and high levels of gamma radiation
As shown above, radon can be a problem when homes are located on top of land contaminated with high levels of Radium-226 due to seepage and diffusion of the gas through the foundation and building up in the indoor air.
However, gamma radiation levels increased at the soil surface create a cancer risk to anyone present on the property, without a structure to concentrate the radon gas, and independent of elevated levels of radon in the structure
Gamma radiation levels can be directly measured at the soil surface and increase due to the concentration of Radium-226 in the soil and the proximity of that contamination to the soil surface
Starting in 1978, Drummond was told that there was a radiation contamination problem with the land