M. P. Unterweger, D. D. Hoppes, F. J. Schima, and J. S. Coursey
Half-Life is a first-person shooter game developed and published by Valve. It came out in 1998 and tells the story of Gordon Freeman, a scientist at the Black Mesa Research Facility, who must survive an alien invasion when an experiment goes horribly wrong.
- This is the README for the Half-Life 1 engine and its associated games. Please use this repository to report bugs and feature requests for Half-Life 1 related products. Reporting Issues. If you encounter an issue while using Half-Life 1 games, first search the issue list to see if it has already been reported. Include closed issues.
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| Radionuclide | Number of Sources | Number of Half Lives Followed | Half Life* | Statistical Standard Uncertainty | Other Standard Uncertainty | References |
|---|---|---|---|---|---|---|
| 3H | 18 | 3 | 4500 ± 8 d | 8 | 0 | 1 (a) |
| 18F | 3 | 13.1 | 1.82951 ± 0.00034 h | 0.00024 | 0.00024 | § |
| 22Na | 5 | 1.9 - 4.7 | 950.97 ± 0.15 d | 0.09 | 0.12 | § |
| 24Na | 14 | 1.1 - 7.6 | 14.9512 ± 0.0032 h | 0.0009 | 0.0031 | § |
| 32P | 2 | 2.8 | 14.263 ± 0.003 d | 0.003 | 0.0 | 6 |
| 44Ti | 1 | 0.35 | 22154 ± 456 d | 180 | 419 | 2 |
| 46Sc | 4 | 3.6 - 10.3 | 83.831 ± 0.066 d | 0.030 | 0.059 | § |
| 51Cr | 11 | 2.3 - 8.9 | 27.7010 ± 0.0012 d | 0.0007 | 0.0009 | § |
| 54Mn | 2 | 3.3 - 7.4 | 312.028 ± 0.034 d | 0.034 | 0.0 | § |
| 57Co | 7 | 4.7 - 10.4 | 272.11 ± 0.26 d | 0.09 | 0.25 | § |
| 58Co | 1 | 9.1 | 70.77 ± 0.11 d | 0.11 | 0.0 | § |
| 59Fe | 6 | 4.0 - 9.3 | 44.5074 ± 0.0072 d | 0.0048 | 0.0053 | § |
| 60Co | 8 | 3.7 - 5.3 | 1925.20 ± 0.25 d | 0.10 | 0.23 | §,6 |
| 62Cu | 3 | 2.7 - 3.9 | 9.6725 ± 0.0080 min | 0.0080 | 0.0 | 3,6 |
| 65Zn | 1 | 3.2 | 244.164 ± 0.099 d | 0.099 | 0.0 | § |
| 67Ga | 13 | 1.8 - 8.3 | 3.26154 ± 0.00054 d | 0.00015 | 0.00052 | § |
| 75Se | 19 | 2.4 - 8.7 | 119.809 ± 0.066 d | 0.014 | 0.065 | § |
| 85Kr | 1 | 1.9 | 3935.7 ± 1.2 d | 1.2 | 0.0 | §,6 |
| 85Sr | 8 | 1.1 - 4.8 | 64.8530 ± 0.0081 d | 0.0039 | 0.0071 | § |
| 88Y | 8 | 1.3 - 8.1 | 106.626 ± 0.044 d | 0.017 | 0.041 | § |
| 99Mo | 14 | 3.6 - 9.5 | 65.9239 ± 0.0058 h | 0.0031 | 0.0049 | § |
| 99mTc | 33 | 2.1 - 12.0 | 6.00718 ± 0.00087 h | 0.00015 | 0.00086 | § (b) |
| 99mTc | 17 | 1.9 - 8.0 | 6.0123 ± 0.0032 h | 0.0007 | 0.0031 | 6 (c) |
| 103Ru | 7 | 0.4 | 39.310 ± 0.044 d | 0.044 | 0.0 | 6 |
| 109Cd | 2 | 3.4 - 5.3 | 463.26 ± 0.63 d | 0.36 | 0.51 | § |
| 110mAg | 1 | 9.3 | 249.950 ± 0.024 d | 0.024 | 0.0 | § |
| 111In | 11 | 1.4 - 9.3 | 2.80477 ± 0.00053 d | 0.00017 | 0.00051 | § |
| 113Sn | 11 | 2.3 - 11.0 | 115.079 ± 0.080 d | 0.025 | 0.076 | § |
| 117mSn | 10 | 1.5 - 4.0 | 14.00 ± 0.05 d | 0.05 | 0.0 | 4 |
| 123I | 3 | 5.4 - 12.7 | 13.2235 ± 0.0019 h | 0.0019 | 0.0 | § |
| 125I | 18 | 1.4 - 6.2 | 59.49 ± 0.13 d | 0.03 | 0.12 | § |
| 125Sb | 1 | 5.4 | 1007.56 ± 0.10 d | 0.10 | 0.0 | §,6 |
| 127Xe | 5 | 1.1 - 11.5 | 36.3446 ± 0.0028 d | 0.0028 | 0.0 | § |
| 131I | 21 | 1.0 - 10.9 | 8.0197 ± 0.0022 d | 0.0005 | 0.0021 | § |
| 131mXe | 2 | 1.8 | 11.934 ± 0.021 d | 0.014 | 0.016 | § |
| 133Ba | 4 | 2.0 | 3854.7 ± 2.8 d | 1.3 | 2.5 | §,6 |
| 133Xe | 3 | 4.8 - 11.2 | 5.24747 ± 0.00045 d | 0.00045 | 0.0 | § |
| 134Cs | 5 | 1.7 - 3.0 | 753.88 ± 0.15 d | 0.11 | 0.11 | § |
| 137Cs | 6 | 0.7 - 0.9 | 11018.3 ± 9.5 d | 3.5 | 8.8 | §,6 |
| 139Ce | 9 | 1.5 - 6.4 | 137.734 ± 0.091 d | 0.029 | 0.086 | § |
| 140Ba | 10 | 1.8 - 4.4 | 12.7527 ± 0.0023 d | 0.0009 | 0.0022 | § |
| 140La | 2 | 4.2 | 40.293 ± 0.012 h | 0.008 | 0.009 | § |
| 141Ce | 1 | 6.1 | 32.510 ± 0.024 d | 0.024 | 0.0 | § |
| 144Ce | 1 | 3.9 | 284.534 ± 0.032 d | 0.032 | 0.0 | §,6 |
| 152Eu | 4 | 1.6 - 1.8 | 4947.2 ± 1.1 d | 0.7 | 0.8 | §,6 |
| 153Gd | 2 | 7.3 | 239.472 ± 0.069 d | 0.041 | 0.055 | § |
| 153Sm | 1 | 7.3 | 46.2853 ± 0.0014 h | 0.0014 | 0.0 | § |
| 154Eu | 3 | 2.4 | 3145.2 ± 1.1 d | 1.1 | 0.0 | §,6 |
| 155Eu | 2 | 3.1 - 4.3 | 1739.06 ± 0.45 d | 0.45 | 0.0 | §,6 |
| 166Ho | 2 | 5.4 - 7.2 | 26.794 ± 0.023 h | 0.013 | 0.019 | §,6 |
| 169Yb | 14 | 3.4 - 9.5 | 32.0147 ± 0.0093 d | 0.0026 | 0.0089 | § |
| 177Lu | 4 | 2 - 5 | 6.64 ± 0.01 d | 0.01 | 0.0 | 5 |
| 181W | 3 | 5.9 - 6.6 | 121.095 ± 0.064 d | 0.042 | 0.048 | § |
| 186Re | 2 | 5.7 - 6.5 | 89.248 ± 0.069 h | 0.018 | 0.067 | § |
| 188Re | 3 | 4.2 - 7.1 | 17.001 ± 0.022 h | 0.09 | 0.021 | §,6 |
| 188W | 1 | 4.0 | 69.783 ± 0.048 d | 0.048 | 0.0 | 6 |
| 192Ir | 1 | 2.4 | 73.810 ± 0.019 d | 0.019 | 0.0 | § |
| 195Au | 5 | 0.6 - 6.0 | 186.098 ± 0.047 d | 0.021 | 0.042 | § |
| 198Au | 4 | 4.5 - 7.4 | 2.69517 ± 0.00021 d | 0.00021 | 0.0 | § |
| 201Tl | 12 | 2.6 - 11.5 | 3.0456 ± 0.0015 d | 0.0004 | 0.0014 | § |
| 202Tl | 1 | 1.4 | 12.466 ± 0.081 d | 0.081 | 0.0 | § |
| 203Hg | 14 | 1.7 - 6.6 | 46.619 ± 0.027 d | 0.007 | 0.026 | § |
| 203Pb | 7 | 1.8 - 2.8 | 51.923 ± 0.037 h | 0.013 | 0.034 | § |
| 207Bi | 2 | 0.9 | 11523. ± 15. d | 9 | 12 | §,6 |
| 228Th | 6 | 1.7 - 8.3 | 698.60 ± 0.36 d | 0.14 | 0.33 | § |
| * | The stated uncertainties are the sum, in quadrature, of the statistical uncertainty (the 'external standard deviation' in the weighted mean) and other uncertainties which include those from the Stevenson equation (NBS Special Publication 626) and from the correction for the 210Bi ingrowth in the radium reference sources. |
| (a) | Measured by internal gas proportional counting. |
| (b) | Normal saline solution. |
| (c) | Acid solution. |
Contacts
Half Life Rtx
Half Life Tor
Set between the events of Half-Life and Half-Life 2, Alyx Vance and her father Eli mount an early resistance to the Combine's brutal occupation of Earth.
The loss of the Seven-Hour War is still fresh. In the shadow of a rising Combine fortress known as the Citadel, residents of City 17 learn to live under the rule of their invaders. But among this scattered population are two of Earth's most resourceful scientists: Dr. Eli Vance and his daughter Alyx, the founders of a fledgling resistance.
Half-life Equation
You and your father were relocated to City 17. In the years since, you've continued your clandestine scientific activity—performing critical research, and building invaluable tools for the few humans brave enough to defy the Combine.
Every day you learn more about your enemy, and every day you work toward finding a weakness.
Lean around a broken wall and under a barnacle to make an impossible shot. Rummage through shelves to find a healing syringe and some shotgun shells. Manipulate tools to hack alien interfaces. Tear a headcrab off your face and throw it out the window. VR was built for the kind of gameplay that sits at the heart of Half-Life.
Half-Life: Alyx supports a variety of play environments, locomotion methods, and input devices.
If you have VR hardware that works with a computer, then it works with SteamVR.
If you don't yet own any VR hardware, now's the time. Headsets support different sets of features, so the experience will vary between them. Half-Life: Alyx was built hand in hand with Valve Index, which is the highest fidelity option on the market, but the game works great with Vive, Rift and Windows Mixed Reality too. Check out the different options to choose which one is right for you.
Contacts
Half Life Rtx
Half Life Tor
Announcement Trailer Gameplay Video 1 Gameplay Video 2 Gameplay Video 3Set between the events of Half-Life and Half-Life 2, Alyx Vance and her father Eli mount an early resistance to the Combine's brutal occupation of Earth.
The loss of the Seven-Hour War is still fresh. In the shadow of a rising Combine fortress known as the Citadel, residents of City 17 learn to live under the rule of their invaders. But among this scattered population are two of Earth's most resourceful scientists: Dr. Eli Vance and his daughter Alyx, the founders of a fledgling resistance.
Half-life Equation
You and your father were relocated to City 17. In the years since, you've continued your clandestine scientific activity—performing critical research, and building invaluable tools for the few humans brave enough to defy the Combine.
Every day you learn more about your enemy, and every day you work toward finding a weakness.
Lean around a broken wall and under a barnacle to make an impossible shot. Rummage through shelves to find a healing syringe and some shotgun shells. Manipulate tools to hack alien interfaces. Tear a headcrab off your face and throw it out the window. VR was built for the kind of gameplay that sits at the heart of Half-Life.
Half-Life: Alyx supports a variety of play environments, locomotion methods, and input devices.
If you have VR hardware that works with a computer, then it works with SteamVR.
If you don't yet own any VR hardware, now's the time. Headsets support different sets of features, so the experience will vary between them. Half-Life: Alyx was built hand in hand with Valve Index, which is the highest fidelity option on the market, but the game works great with Vive, Rift and Windows Mixed Reality too. Check out the different options to choose which one is right for you.
HTC Vive
Windows Mixed Reality
Appears in your Steam Library
There's no need to enter a key or purchase the game. It just appears in your Steam Library.
…No matter when you bought your gear
Half-Life: Alyx is yours, whether you've had your Valve Index for a while, or are just about to take the plunge.
…Or whether you have the whole VR kit
Owners of Valve Index controllers also get Half-Life: Alyx for free.
A set of Source 2 tools for building new levels is included with the game, enabling any player to build and contribute new environments for the community to enjoy. Hammer, Valve's level authoring tool, has been updated with all of the game's virtual reality gameplay tools and components.
The Half-Life Alyx Soundtrack will be released in a chronological fashion following the chapters of the game. While chapters are being published, the soundtrack will be available for streaming on Spotify and Apple Music, and for download on Steam Music. Once the entire soundtrack has been released, it will become available on all major music streaming and download platforms.
Half Life 2
