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I had an idea about a weapon which kills people using radioactivity bursts:

Weapon function: It kills a specific person with radioactivity. It should be as selective as possible. Some wider range is expected, but should be as low as possible.

Requirements for the weapon:

  • Should be wearable by one person.
  • Should be safe to use
  • Should be quick and allow more than one shot
  • Should be built using today's technology. No unobtainium please.
  • Range at least 100 metres. I would like to have a rather ranged weapon

Can you help me with designing this weapon? Also, is it even feasible to build?

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    $\begingroup$ The trouble with radioactivity damage is that it kills comparably slowly, in a matter of days - thus useful for murder but not so much for quick tactical combat. The power level that would kill immediately would just be a variant of any other high-powered laser/"ray gun" where the mechanism of killing is essentially focused application of power/heat burning a hole in the target. $\endgroup$ – Peteris Nov 20 '16 at 14:44
  • $\begingroup$ What is the range of this weapon? $\endgroup$ – Zxyrra Nov 20 '16 at 15:41
  • $\begingroup$ @Zxyrra I would like to have it rather ranged weapon. Added to question $\endgroup$ – Pavel Janicek Nov 20 '16 at 15:53
  • $\begingroup$ "Radium" is "range", perchance? $\endgroup$ – The Nate Nov 20 '16 at 16:32
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    $\begingroup$ Going back to my school days - even gamma rays, the most penetrating forms of radioactive radiation, can only penetrate 5m of air, so I don't think a 100m range is going to work. $\endgroup$ – colmde Nov 21 '16 at 13:30
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The problem is that with most weapons in the normal sense of the word the priority is to stop the enemy or render them ineffective rather than actually killing them. Indeed there is a school of thought that actually killing the enemy is the least effective approach. For a variety of reasons.

  1. Most people have a strong natural aversion to killing other people and even if you can overcome this with training you are effectively eroding the moral fabric of your own society.
  2. Someone who is injured enough to be incapacitated but still likely to survive places a big logistical burden on their own side. If the soldier next to you is killed you just keep going, if they are injured then there is a temptation to stop what you are doing and help them. Then you need a whole system of logistics to evacuate and treat them or you could just leave them to die and watch the moral of your troops plummet. There is a big difference between someone dying outright and just letting them die because it is too much trouble to save them.
  3. Killing lots of people makes the ultimate diplomatic resolution of a conflict more difficult.
  4. The practical objective of warfare is to stop the enemy from doing what they want to do. If someone is shooting at you your priority is to stop them from doing it right now.

Radiation fails on all counts. It will certainly kill people but not immediately and indeed they may not even be aware of receiving a fatal dose untill you get into the realms of particle beams which will actually put holes in them and even this it would need to be a big hole (there are in fact accounts of people who have had holes burned right through them with particle beams and not immediately noticed).

It is also entirely possible to receive a fatal dose of radiation and continue to function normally for a reasonable period of time.

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  • $\begingroup$ While this helps OP in describing the effects and purpose of such a weapon (maiming instead of killing) it may also be helpful to answer the question as to the feasibility and design of such a weapon $\endgroup$ – Zxyrra Nov 21 '16 at 1:15
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Consider a gun with radioactive bullets. Just don't miss.

While making radioactive substances can be expensive, if your attacker has the money to use radiation instead of normal guns, poison, etc to kill, I'm sure they have the money to buy or make radioactive substances.

Wearable: Somewhat
You may want to research radioactive substances and how they're made - depending on what bullet material you pick, the attacker may or may not need a cyclotron to make bullets on site before the bullets decay. Unfortunately cyclotrons are not wearable. However, a gun and a briefcase of bullets may suffice for other isotopes if the bullets don't decay quickly.

Safe to User: Somewhat
They must take precautions to avoid poisoning themself, but after that, it should be safe.

Quick firing: Yes
Consider a gun that allows multiple rounds before reloading.

Quick death: Somewhat
Radiation kills through tissue death, so, depending on what isotope you use, it may or may not kill tissue quickly.

Today's Tech: Yes

One Person: Yes

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  • $\begingroup$ My grandfather's cancer treatment consisted of a grid of radioactive pellets implanted around the cancer. These were nearly microscopic, but they did give a few health complications. I think a bullet sized pellet could be devastating, especially if it's made to fragment. The bullet could also use a radioactive liquid instead of a solid slug, which would be far harder to get out/treat. $\endgroup$ – Lu22 Nov 21 '16 at 9:17
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With adjustments and some stretching, this is feasible.

Consider basing your machine off of external beam breast cancer radiation. It's a process that targets specific areas of the body (usually breasts) with enough radiation to kill weaker cancer cells, but not enough to cause significant damage to surrounding healthy cells.

It is completely within the realm of modern science to use a more concentrated or more powerful beam that affects normal, healthy cells, causing tissue death.

While this is not ideal for several reasons, which I will go into detail about below, it is probably the closest thing modern science has to "controlled radioactive bursts".

Wearable: No
This is what the cancer treatment version of the machine looks like: enter image description here
Obviously this is too large to compact into a wearable device with today's technology - you probably won't find any type of radiation besides a projectile that doesn't take up a lot of space.
Alternatively consider mounting a device inside or on top of a vehicle, inside the wall of a building, or whatever is necessary for the situation you want.

Safe to User: Yes
As long as the person employing the device is not directly in front of it, the radiation produced will not harm them.

Quick firing: Plausible
This type of device is used over weeks to target specific areas safely. Your concern is not safety, so with a concentrated beam, it may take seconds or minutes of standing in the path of the device for considerable damage to be done.

Quick death: Not possible with radiation
Even the strongest radiation poisoning takes some time to break down cells. Your best hope with today's technology - on a portable weapon - is to cause tissue death, in the brain, heart, or lungs.

Multishot: Does not apply
Radiation is usually applied in beams, not bursts. This will be true for most answers to this question. However the beam can be maintained.

Today's Tech: Yes
All of this is based off of existing technology.

One Person: Yes
If we can already concentrated beams of radiation, there is no reason it won't work for your device.

Ranged: No
See my other, projectile-based answer for ranged radiation - but generally radiation doesn't work well with range. Unless you're detonating a bomb or melting down a power plant, it's very hard to target radiation over a large area.

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If you want "fast" acting radiation sickness, forget about it being localised, or safe. Levels of radiation that are instant (i.e. onset within seconds to minutes from exposure) require extreme levels of radiation, and not just any type of radiation, but either fast neutrons, or gamma emissions (as they are most energetic ones). For prompt effect you will want 6-8 thousand rem of prompt, full body exposure equivalent, which is basically putting a person in front of a industrial- or weapon-grade criticality event. Like this one: https://en.wikipedia.org/wiki/Cecil_Kelley_criticality_accident or https://en.wikipedia.org/wiki/SL-1 (warning: descriptions are graphic, and might be unpleasant to read.)

Both incidents involved very large amounts of enriched fissiles, and a critical configuration of them, and its not really possible to direct that kind of high energy outputs on a single person, w/o affecting everything in general area.

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While there are good answer as to why it can't be done I'm going to back up and look at the big picture.

Usual types of radiation:

Alpha 
Beta 
X-ray/Gamma 
Neutron

Alpha--very short ranged in atmosphere, it can't meet your range requirement. Beta--does a bit better but it still can't do anything like 100m.

X-ray & Gamma ray. The big problem here is that we have no means of focusing these. All devices that produce a "beam" of these do so by using an omnidirectional source and shielding off the part that's not going where you want it. That shield is big and heavy, thus making it impossible for one person to carry.

Neutron. Again, a focusing problem. Neutrons lack a handle to grab. Now, it is possible to make a neutron beam but that involves accelerating a charged particle stream and then somehow splitting the neutrons out once the beam is already underway. That's in atom-smasher territory and atom smashers are characterizes by their huge booster rings. (Absolutely necessary--the smaller the booster ring the faster the particles turn and if you make too high an energy particle turn too fast it loses energy. Thus your energies are limited by the size of the booster ring--you're not packing much in a booster ring you can hold in your hands.)

Now for things other than the traditional types of radiation:

Proton beam. See my argument about neutrons. Pretty much the same equipment. I also question whether it can go far enough in atmosphere.

Now, if you'll drop the portable requirement it can be done. There are two means of building an x-ray laser with today's tech.

The simple and small one is utterly out of the question for your scenario. A properly-shaped rod exposed to a sufficient energy flux can laze and produce a death beam. Both x-ray and gamma ray beams are possible. The problem is that we have only one means of generating that energy flux: the detonation of a nuclear device.

The other alternative can only produce an x-ray beam. I don't recall most of the details but it's a free electron laser--and the power source is a sibling of the atom smashers. IIRC your ring is about 1km across.

However, after shooting down your weapon how about an alternative that still doesn't meet your requirements but comes a lot closer:

Lets consider a microwave beam--sibling to the mundane microwave oven. A microwave oven puts out something like 1kw, not a good thing to be exposed to but it's not going get a kill fast enough for combat purposes. Lets beef it up considerably, if your focus and aim is good 100kw should do the job. That should give you a kill of the flesh to the penetration depth of the beam over a target the size of a human head. While the actual dying will take time you have a combat kill as any of their sensory organs pointed your way is gone. (You have to shoot from in front of them to make this work!) 100kw and the focusing dish are way beyond what your soldier can carry but I wouldn't be shocked if this could be built as a dedicated vehicle weapon. Slow firing, though.

(On the other hand, I can see no reason to build it other than for reasons of stealth.)

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No, it is not feasible, because radiation does not kill quickly

Forget all Hollywood myths about ionizing radiation. In movies people get a dose of radiation and — hurgh — they die. That is not how it works.

In real life, if you receive a lethal dose of radiation, what happens is usually:

  1. Sudden nausea, fever, headache, diharrea.
  2. Several days of relative well-being
  3. Gradual organ failure, starting with the gastrointestinal track

In order to have any instant incapacitation you need to reach doses of 8 to 30 Gray. Even for the firefighters at Chernobyl, that were wandering around among the pieces of a wrecked 1000 MW nuclear reactor, it took them several minutes to reach that dose.

So for practical reasons: no, you cannot make something that instantly incapacitates one person.

You could make something that targets one person and makes them ill enoigh to die from radiation poisoning. For example. Alexander Litivenko was poisoned with Polonium-210. But the process is slow. So what you have done then is essentially just make a plain old poison weapon, the only difference being your mechanic of destruction is radiation instead of a chemical.

Your next wish is that you wish to target only one person, and for the weapon to be "safe" to use. Well there you have the same issues as if you were fighting with chemical weapons:

  • the target will be toxic
  • collateral damage is next to unavoidable
  • if you miss, you have toxic materials laying about in the terrain
  • if you mishandle the weapon, or if you take enemy fire, or if your weapons get stolen, the effect of your weapon is quickly turned against you

You asked for a reality check... and that check says: no, this is not a feasible wepon at all. It is hard to get materials that "shines" that strong; it cannot kill quickly; it is extremely hard to make it so that it targets individuals while avoiding collateral damage; it is a safety nightmare in that you must handle it carefully or the effect will blow up in your face; if you miss (or hit for that matter) you will have poisoned the surroundings which may be a hindrance to you.

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