Question

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1.All the following are effective in blocking gamma particles except

	3-foot thick concrete walls
	storage deep in a water tank
	3-cm thick lead-lined containers
	high-density plastic coated with reflective aluminum

2. When Au-201 emits a beta particle, it decays into

	Hg-201
	Pt-201
	Pt-200
	Au-200

3.If an element changes into another element in a reaction, it must be a

	chemical reaction
	synthesis reaction
	replacement reaction
	nuclear reaction

Answer 1