Collection and preparation of
soil samples were collected from within Kasetsart University, a total of 30 samples at a depth of 20 cm at each sampling point must be quite a lot of areas where people live. After the soil samples collected to reprogram all dried at a temperature of 50 degrees for 24 hours until dry removal of roots and grass stuck. Then the 2 mm sieve size, so that the soil samples are similar. Then packed into a container Mario McNally beaker (Marinelli beaker), 500 ml, which is the same size as the standard compound used in the detection. It must also be sealed plastic container containing the soil samples with tape to prevent the release of radon gas - piping hot. And then stored for a period of at least one month to achieve equilibrium in the radioactive soil samples.
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