which type of radiation emitted by radioactive atoms has the least ionising power?

Gamma radiation has the least ionising power among the common types of radiation emitted by radioactive atoms (alpha, beta, gamma).

Quick Scoop

When radioactive substances decay, they usually emit three main types of radiation :

• Alpha (α) particles
• Beta (β) particles
• Gamma (γ) rays

Out of these:

• Alpha has the highest ionising power but very low penetrating power.

• Beta has medium ionising and penetrating power.

• Gamma has the lowest ionising power but the highest penetrating power, which is why thick lead or concrete is needed to stop it.

So, to answer the exact question “which type of radiation emitted by radioactive atoms has the least ionising power?”:

The radiation with the least ionising power is gamma radiation.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.