While there have been many studies on radiation hormesis, it is a concern that the dosage rate is an important factor. In this test, we examined and observed dosage rates. Under the condition of 100 kV voltage and 1.8 mA current, we irradiated and observed white radish sprouts at low-level radiation of 0 mGy/day (control), 50 mGy/day for 10 days (total dosage 500 mGy), and 100 mGy/day for 5 days (total dosage 500 mGy) . Two weeks later, we measured plant growth, and it was statistically evident that the object of 100 mGy/day irradiation has grown longer compared with the other two groups that were examined (p<0.001) .