air      alpha      aluminium      background      beta      concrete      gamma      hazard      ionising      lead      paper      penetrating      radioactive      radioactivity      rocks      sources      space      three   

(a) Some substances give out atomic or  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree radiation all the time, whatever is done to them, and these are said to be  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree.
(b) There are  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree types of radiation emitted by radioactive  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree:
(c)  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree radiation is easily absorbed by a few centimetres of  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree or a thin sheet of  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree.
(d)  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree radiation easily passes through air or paper but is mostly absorbed by a few millimetres of  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree.
(e)  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree radiation is very  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree and requires many centimetres of  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree or several metres of  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree to absorb most of it.
(f) There are radioactive substances all around us, including e.g. granite  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree in the ground, in the air, in building materials and in food.
(g) Radiation also reaches us from outer  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree. The radiation from all these sources is called  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree radiation.
(h) is the  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree warning symbol for  airalphaaluminiumbackgroundbetaconcretegammahazardionisingleadpaperpenetratingradioactiveradioactivityrockssourcesspacethree.

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