Injectable steroids are injected into muscle tissue, not into the veins. They are slowly released from the muscles into the rest of the body, and may be detectable for months after last use. Injectable steroids can be oil-based or water-based. Injectable anabolic steroids which are oil-based have longer half-life than water-based steroids. Both steroid types have much longer half-lives than oral anabolic steroids. And this is proving to be a drawback for injectables as they have high probability of being detected in drug screening since their clearance times tend to be longer than orals. Athletes resolve this problem by using injectable testosterone early in the cycle then switch to orals when approaching the end of the cycle and drug testing is imminent.
The issue of relative risk is central to addressing this choice rationally. Many people around Chernobyl have decided that they would rather face an undefined (but potentially larger) additional risk and have unofficially returned to their homes already – rather than live miserable lives in permanent exile. We all face risk in everything we do, of course, and the additional risk presented by radiation is small in comparison both to the background statistical risk of getting cancer anyway. It should also be considered alongside the carcinogenic risks presented by other activities like smoking, consuming alcohol, eating a lot of meat and so on.