Radon and thoron are element chemical in group of noble gases, play an important role as the most radioactive material in nature. But, their existence can only determine be measuring. Furthermore, the measurement of concentration of radon and thoron in Londa and Ke???te??? Kesu??? cave was conducted with alpha path method (Radon-thoron passive dosimeter with CR-39 as it???s detector). Radon-thoron dosimeter was installed along the line of the cave for 14th days. The result showed that concentration of radon and thoron are varied on every measurement spots starting from the entrance all the way to end of the cave. The obtained concentration both of them told us, that the highest radon placed on 92 meters depth from the entrance of cave which is about 1122 Bq/m3 and the highest thoron placed on 72,5 meters depth which is about 1785 Bq/m3. Mean while in Ke???te??? Kesu cave, the concentrations both of them have the highest value than the concentrations in Londa cave, which have the concentration of radon is about 21247 Bq/m3 and the concentration of thoronis about 19815 Bq/m3 placed on the same depth which is 48 meter from the entrance of the it???s cave.
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