What materials make the best shields?

[shakystew]

What shielding materials are best choices for reducing dose from:

Neutrons:
Gamma rays:
Electrons:
HCP: (heavy charged particles)​

I know, good neutron shields can be hydrogen (can be explosive though) or concrete, beta/electrons is a combo of low Z-material to block e- then high Z-material to absorb Bremmsstrahlung.

Thank you in advance!

 

[mfb]

Hydrogen can be stored as water or with similar molecules - reasonable density of hydrogen atoms, liquid or solid at room temperature, not explosive.

For gammas and high-energetic electrons: everything with a short radiation length. Lead is relatively cheap, tungsten is better but probably more expensive, iron is very cheap but you'll need more material.
Heavy charged particles at which energy? Within the range of the Bethe formula, everything with a high density.