The counter registers beta particles of a radioactive preparation of very low intensity. Does the counter occur at regular intervals?

No, it does not, as it is impossible to predict when the decay will occur. The time intervals for the counter are different. If the intensity of the drug were high, it would mean that there are many atoms in the drug. The counter would register the average lifetime of a large number of atoms, and this lifetime is a constant. And the counter would be triggered at regular intervals.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.