it helps some times No, definitely not. The C/C++ standard library's builtin rand() function is usually implemented as a

linear congruential generator (LCG). It is among the earliest known family of pseudorandom number generators (PRNGs) and they generally have notoriously bad statistical properties. Furthermore since PRNGs actually produce a mathematical sequence predetermined by an initial seed, they are predictable. Even cryptographically secure pseudorandom number generators (like the

Blum Blum Shub) are predictable, even if it's computationally difficult and very time consuming to predict the sequence.

In contrast, random number generators based on radioactive decay are true random number generators. The generated sequence of numbers is perfectly uniformly distributed and unpredictable, without any measurable correlation between the samples.