Question

The two known units of radioactivity and the relation between the two are _______

(a) Curie and Becquerel 1 Ci = 3.7 x 1010 Bq

(b) Curie and Becquerel 1 Bq = 3.7 x 1010 Ci

(c) Curie and Roentgens   1 Ci = 1000 R

(d) Roentgen and Becquerel  1 R = 1000 Bq

This question was posed to me during an online exam.

My enquiry is from Diathermy, Measurement of Radiation, Dose and its Calculations in section Radiation Therapy of Clinical Science

Answer 1

Right choice is (a) Curie and Becquerel 1 Ci = 3.7 x 1010 Bq

For explanation: Curie and Becquerel signify the amount of disintegration of the radioactive substance in a unit time. Curie was an older unit and had a very high value which was not feasible for elements with lower activity. Thus, Becquerel unit was created which is one disintegration per second.