A Becquerel is a useless measure. It is one disintegration per second. A curie is a useful measure. 3.7×10^10 decays per second, the activity of 1 gram of the radium isotope. There is the curie meter rem rule. One curie of radiactivity at one meter distance gives a dose of one Rem per hour. A rem you take note of because 100 Rem and you get rather sick, but not dead. 250 Rem and you start to get dead. Stand back two meters and now the does is 1/4 Rem per hour. And you can use lead shielding, etc. etc.
I agree, but I was kidding about the bias.
Bq is useful when disintegration rates are low. Otherwise Ci is better, I agree.