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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: New fusion power system test creates 300,000 degrees C plasma
Date: Sat, 30 Nov 2024 13:59:07 -0800
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On Sat, 30 Nov 2024 21:12:23 +0100, Jeroen Belleman
<jeroen@nospam.please> wrote:

>On 11/30/24 18:19, john larkin wrote:
>> On Sat, 30 Nov 2024 11:57:50 +0100, Jeroen Belleman
>> <jeroen@nospam.please> wrote:
>> 
>>> On 11/30/24 10:34, Liz Tuddenham wrote:
>>>> Jeroen Belleman <jeroen@nospam.please> wrote:
>>>>
>>>>> On 11/29/24 23:03, Liz Tuddenham wrote:
>>>>>> Jeroen Belleman <jeroen@nospam.please> wrote:
>>>>>>
>>>>>>> On 11/29/24 21:04, Liz Tuddenham wrote:
>>>>>>>> Jeroen Belleman <jeroen@nospam.please> wrote:
>>>>>>>>
>>>>>>>> [...]
>>>>>>>>> It would be lovely to have 50kWTh or so of PU238 in the basement,
>>>>>>>>> if it could be made cheaply enough. Power for a lifetime for the
>>>>>>>>> whole house and then some.
>>>>>>>>
>>>>>>>> ...but the lifetime might not be very long if any got out.
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> If, if. Such arguments can be used to prove anything.
>>>>>>>
>>>>>>> I've got a diesel-powered car in the basement garage. Fully tanked,
>>>>>>> it contains 60kg of fuel, good for 2.4GJ or so. Imagine the havoc
>>>>>>> that could cause, if it got loose. For reference, a stick of dynamite
>>>>>>> is about 1MJ.
>>>>>>
>>>>>> I've seen what happened when builders accidentally set fire to a tank of
>>>>>> diesel far bigger than that.  It burned slowly and steadily until it set
>>>>>> fire to the roof of the house - then the house burned down.  Nobody was
>>>>>> injured or killed, the mess was easily cleaned up and a new house built
>>>>>> on the site.
>>>>>>
>>>>>> It wasn't like the sudden release of energy you would get in a fuel-air
>>>>>> explosion (quite difficult to initiate with diesel without specialist
>>>>>> knowledge) and there wasn't a lot of residual toxic contamination.
>>>>>>
>>>>>>
>>>>>
>>>>> OK. Now back to small 238Pu fuelled units. Why would you expect
>>>>> anything to go wrong if the Pu was contained in a hermetic canister?
>>>>
>>>> There's always an idiot (or a terrorist) who would challenge themself to
>>>> open it.
>>>>
>>>>
>>>
>>> Yes, probably. There have been similar incidents in the past.
>>> I'm convinced it can be made safe enough for widespread normal
>>> use, but there will always be some fool somewhere. If we let
>>> that stop us, no technology is safe enough.
>>>
>>> Jeroen Belleman
>> 
>> A kilogram, properly distributed, would make a city uninhabitable for
>> centuries. Imagine such an active alpha emitter in a water supply.
>
>There are myriad ways to create havoc, if we wanted to. I have castor
>plants in the garden. They are very decorative. Properly distributed,
>there is enough ricin in them to kill tens of thousands of people.
>Nobody cares. Weaponizing noxious substances isn't so easy.
>
>> 
>> It would make some cool glow-in-the-dark gadgets.
>> 
>> Critical mass is around 10 Kg. Kids could make nukes.
>> 
>
>238Pu doesn't sustain a chain reaction, at least not in the quantities
>we talk about. Nukes use 239Pu, the fissionable isotope. That's the
>isotope that has a critical mass in the 10kg ballpark. Even then, it's
>*very* hard to keep it together for long enough to create a sizable
>explosion. No kid is going to pull that off, even if he could get his
>hands on 239Pu in sufficient amounts.
>
>Jeroen Belleman

Wiki claims 

https://en.wikipedia.org/wiki/Plutonium-238

10 Kg critical mass. Are they wrong?