A radiation dose assessment exercise was carried out for the edible biota Solanum nigrum, Carica papaya, Raphnus sativum and Phaseolus domesticus due to naturally available radionuclides ⁴⁰K, ²³⁸U and ²³²Th in the Domiasiat area in Meghalaya , India. The concentration of radionuclides in biota and corresponding soil was measured by the NaI(Tl) detector having a minimum detection limit (efficiency, 32.4 %) and machine counting time of 3000 s. The obtained transfer factor for 40K was 0.3061, 0.7163, 0.1988 and 0.1279, for ²³²Th 0.0003, 2.22E—05, 2.71E—05 and 3.45E—05 and for ²³⁸U 1.46E—05, 9.73E—05, 1.46E—05 and 3.11E—05 (ratio) in each biota, respectively. The detailed physiological and morphological study of the biota was carried out. The point source dose distribution (source↔target) hypothesis was applied for the radiation absorbed fraction. The generated data were modelled using FASSET and obtained un-weighted total dose was 1.78E—04, 6.84E—03, 8.46E—03 and 1.73E—04mGy h^-1, respectively, finally compared with the IAEA and UNSCEAR data set for screening level dose risk assessment.