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Answer: Aluminum, tin, and copper
Explanation: Optically stimulated luminescence (OSL) is a method in which the ionizing radiation help in measuring of the doses. It has working dependent on the radioactivities which are present in the sediments.
The filters that are used for detection of the OSL is usually made of aluminium , copper or tin because the can easily detect isotopes in the sediments which is cause by minerals like uranium etc.
Answer:
the 8th term of the given series =n( n+1)÷2= 8(8+1)÷2 = (8×9)/2 = 72÷2 = 36
