So suppose a sample has a count rate of 3,200 Becquerel (Bq) at the start, what its count rate would be after 8 days would be 1/16th of 3,200 Bq = 200 Bq. However, the player knows next to nothing about them. The Combine first appear at the very beginning of Half-Life 2. They are one of the most brutal examples of a dystopian society in gaming. So if the half-life is two days, four half-lives is 8 days. Ruthlessly inhuman, The Combine come off as especially intriguing and disturbing for their extreme level of scrutiny in their oppression. This could then be incorporated into other data. a ratio – given in the form 'activity after n half-lives : initial activity', in this case 1:16.a decimal – 1/16 = 0.0625 of the original sample.a fraction - a ½ of a ½ of a ½ of a ½ remains, which is ½ × ½ × ½ × ½ = 1/16 of the original sample.This could be stated as a fraction, decimal or ratio.įor example the amount of a sample remaining after four half-lives could be expressed as: It should also be possible to state how much of a sample remains or what the activity or count should become after a given length of time. Calculating the isotope remaining - Higher If a sample of a tree (for example) contains 64 grams (g) of radioactive carbon after 5,730 years it will contain 32 g, after another 5,730 years that will have halved again to 16 g. Bring the brutality and chaos of the Combine regime to the hidden rebel sanctuary of City 10. Experience a time before the fall of City 17 11 months before the deployment of Gordon Freeman. The half-life of radioactive carbon-14 is 5,730 years. Be the bad guy in this modification for Half-Life 2 : Episode 2 and step into the boots of a stranded Metrocop, left for dead in the abandoned City 10. This process continues and although the count rate might get very small, it does not drop to zero completely. A third, two day period from four days to six days see the count rate halving again from 20 down to 10.
Note that this second two days does not see the count drop to zero, only that it halves again. It takes another two days for the count rate to halve again, this time from 40 to 20. The illustration below shows how a radioactive sample is decaying over time.įrom the start of timing it takes two days for the count to halve from 80 down to 40. Count-rate is the number of decays recorded each second by a detector, such as the Geiger-Muller tube. Join them as they go through the events at Black Mesa and see how far they can.
Half life combine Pc#
Half-life is the time it takes for half of the unstable nuclei in a sample to decay or for the activity of the sample to halve or for the count rate to halve. Persia and David revisit one of the most influential PC games ever: Half-Life.