Strontium-90 Is Produced in Nuclear Fission Reactors

question 50

Multiple Choice

Strontium-90 is produced in nuclear fission reactors.If ingested it can replace calcium in the bones.The half-life of ⁹⁰Sr is 27.7 years.If the activity of ⁹⁰Sr in the bones of an exposed person were 90 disintegrations per second,how long would it take the activity of ⁹⁰Sr to decrease to 9.2 disintegrations per second?

• A) 91 years
• B) 67 years
• C) 46 years
• D) 54 years
• E) 78 years

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Definitions:

Inventory Unit Costs

The costs associated with obtaining or producing a single unit of inventory, encompassing material, labor, and overhead.

Average Cost Method

An inventory valuation method that assigns the average cost of all similar items in the inventory until they are sold.

LIFO

LIFO, or Last In, First Out, is an inventory valuation method where the last items to be added to inventory are assumed to be the first ones sold.

Ending Inventory

The total value of a company's merchandise, goods, and products held at the end of an accounting period.