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Old 12-10-2019, 11:38 PM
country_boy country_boy is online now
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My employer, back in the 60s got a hold of some fallout. Test fallout. Someone with DCPA ordered up tons of sand graded similar to what they saw from existing above ground nuclear tests. We for example dumped a few hundred pounds on the roof , washed it off with fire hoses, and inspected how much got retained in the roof drain piping. While most washed out of the building, areas near the roof drains would be “ no linger” zones. These tests also verified that the fire pumps were adequate to was off the roof. Apparently they really had to dial the flow back, to get the low pressure stream needed.

While the basement was underground, with 18” walls, there was only a minimum of 6” of concrete in the first and second floor, so minimizing the fallout on the roof was important.

As for ventilation, commercial buildings with makeup air can ingest fallout, due to the much higher velocities in the air intakes- really not analogous to single family dewellings at all.
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Old 02-10-2020, 03:28 AM
iainventor iainventor is offline
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You are right when it comes to using 55 gallon barrel of water as shielding every 8 inches of water depth is a shielding factor 1/2 , then 1/4, 1/8. 1/16, 1/32, 1/64 so if 48 inches depth shielding factor of 6. so that would mean 1/64 the original outside dose rate was would be multiplied by 1/64 so if 100 rads an hour was dose rate multiply by 1/64 in decimal equals approx 0.0156 or round up to 0.02 so the total dose inside the shelter is.
100 rads/hr x 0.02 Shielding factor = 2 rads/hr total dose per hour.
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Old 02-11-2020, 08:57 AM
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Originally Posted by GrizzlyetteAdams View Post
Does anyone know to what extent that books can be used as an expedient fallout shield?
You will likely have to engage in some rational thought. While I am sure there are plenty of guides and one of them will say 'X amount of books', but what books? Really it is about three things: 1) putting 'mass' between you and the bad stuff, 2) putting space between you and the bad stuff, and 3) putting time between you and the bad stuff.

In your case you are asking about mass. The standard that gets tossed around that is a decent starting point is three feat of dirt as a barrier. This is considered to stop about 1/1000 of your exposure. So, in your case, when asking about what extent books do the job just ask the question 'how many books, in mass/weight, do I need as a barrier to equal three feat of dirt'. Make sense?

Of course, if that standard is good for you will depend entirely on your location and exposure. If there is almost no exposure, then that three feat of dirt is way over kill. If you were, however, say in Seattle then it likely would be far less than you would need.

Probably the real answer to any such question is 'more', if we are being honest. Rather than saying 'I got this, I am safe'. You might be better off just adding what you can until you can't add any more.

Honestly though, it all will come down to the scenario and your location. Which is really where all of these discussions should begin.
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Old 02-14-2020, 01:30 PM
country_boy country_boy is online now
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Originally Posted by iainventor View Post
You are right when it comes to using 55 gallon barrel of water as shielding every 8 inches of water depth is a shielding factor 1/2 , then 1/4, 1/8. 1/16, 1/32, 1/64 so if 48 inches depth shielding factor of 6. so that would mean 1/64 the original outside dose rate was would be multiplied by 1/64 so if 100 rads an hour was dose rate multiply by 1/64 in decimal equals approx 0.0156 or round up to 0.02 so the total dose inside the shelter is.
100 rads/hr x 0.02 Shielding factor = 2 rads/hr total dose per hour.
Actually the math is going to be close to 0.25 shielding factor( 4 PF) - round drums leave big uncovered spaces between drums and that quickly dominates. Drums are only 36 tall also
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