When measuring radioactive things why is it important not to change the distance between the shielded readings and the unshielded readings?

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

b) nuclear ive learned that in a pedtrodic table

50.23 i believe is correct but don't quote me on that.

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