For former game developer Chad Jessup, it's probably the beta version of the original Half-Life he uncovered this month, now shared to the Internet Archive by videogame preservation enthusiast ...

After emitting an alpha or beta particle, the nucleus will often still be ‘excited’ and will need to lose energy. It does this by emitting a high energy electromagnetic wave called a gamma ray.

Look at this point on the graph in relation to the y-axis. You will see that the counts per minute have halved in two days. This means that it has a half-life of two days.

As expectation grows of a new Half-Life game announcement ... which is still listed as an 'upcoming release' despite being in beta). A thread on the Valve reddit has highlighted the recent ...