The blast radius for the 1 kg bare explosive detonation is 130 m. This answer is obtained by using the range safety equation, based on Hopkinson-Cranz Law:
R = 130 × W(1/3) = 130 × 1(1/3) = 130 m
The intensity of the blast wave front is inversely proportional to the cube of the distance. Therefore, just by doubling the distance, you'll be shielding yourself from significant exposure. Read more