NURSING EXAM QUESTIONS
MICROBIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Becquerel and curie
|
|
|
Kcal and cal
|
|
|
Kpascal and pascal
|
|
|
None of the above
|
Detailed explanation-1: -The original unit for measuring the amount of radioactivity was the curie (Ci)–first defined to correspond to one gram of radium-226 and more recently defined as: 1 curie = 3.7x1010 radioactive decays per second [exactly]. 1 becquerel = 1 radioactive decay per second = 2.703x10-11 Ci.
Detailed explanation-2: -A material’s radioactivity is measured in becquerels (Bq, international unit) and curies (Ci, U.S. unit). Because a curie is a large unit, radioactivity results are usually shown in picocuries (pCi). A picocurie is one trillionth of a curie. The higher the number, the more radiation released by the material.
Detailed explanation-3: -The becquerel (symbol: Bq) is the SI unit of radioactivity and is defined as one nuclear disintegration per second 1; it officially replaced the curie (Ci), the unit in the superseded cgs system, in 1975.
Detailed explanation-4: -The curie (symbol Ci) is a non-SI unit of radioactivity originally defined in 1910.