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I think it is because a photon has less energy that is why it has less ability than a gamma ray photon
Gamma ray photons have a higher frequency (and therefore carry more energy) than X-ray photons.
Gamma rays. Each individual photon is more energetic, at any rate.
A photon is a packet of electromagnetic radiation. An X-ray photon is one of these with a wavelength in the range of 0.01 to 10 nanometers.
Gamma ray
gamma ray photon
an energy ray with no mass and no charge
The gamma ray because a photon does not have electric charge and is thus does not experience force in a EM field. All the others are charged particles
Gamma rays are electromagnetic waves ... physically and functionally identical to radio, light, heat, etc. ... with the highest observed frequencies (shortest observed wavelengths). In experiments designed to reveal the particle nature of electromagnetic radiation, gamma ray particles (photons) have the highest observed photon energies.
Gamma, i.e. photon emitted from the nucleus, has the highest penetrating power.
The energy of a photon is correlated with its wave frequency - and gamma rays are by definition very high frequency photons compared to red light photons.
Since x-rays have lower frequencies than gamma rays have, each x-ray photon carries less energy than a gamma ray photon carries. Both carry enough energy to damage living cells.