Prepper Forum / Survivalist Forum banner

How much radiation is safe?

305 Views 4 Replies 4 Participants Last post by  paraquack
No where online seems to provide direct answers to the following questions:

1. How many sieverts is a safe level on a dosimeter, before having to seek shelter.

2.How many sieverts is safe to leave the shelter either temporaily or permamently.

3. What level should a dosimeter read before taking Potasium Iodide.

I appreciate that there are different opinions and factors involved, but I'd be interest in suggested figures.
1 - 5 of 5 Posts
Form everything I can find about radiation, so much depends on the dosage per time (minutes or hours or days). A small dose over a long period of time isn't too bad. A small dose if a few seconds, well, let's say you're on borrowed time.
Potassium Iodide is really recommend for kids, not adults.
Attached is a paper I found back in 2017, when I was extremely concerned about N Korea.
Because of my concern, I did a lot of research and presented it to my local group. One thing I was surprised to learn was the CDV-715 radiation detector is not a Geiger counter. If you get a reading on your CDV-715, it's probably too late for you. Only the CDV-700 is a real Geiger counter, capable of reading low radiation levels. For those of you who went out and purchased modern Geiger counters, don't forget to protect from an EMP.


  • Like
  • Helpful
Reactions: 2
Really how close do you live to a primary target of a nuke? If close do you have access ♿ to a shelter? There are target maps available based on the size and type of weapon. Radiation exposure and strength is directly proportional to the inverse of the distance and the amount of elapsed time from the event.

If you find you are too close to survive then maybe it's time to make amends with the big guy upstairs.

If you can survive the event radiation exposure is going to be one of your lesser concerns

Good luck 🤞🤞
I threw your questions at ChatGPT, and got some interesting responses.
First, it said any reading under 1 Sv was generally safe. However, it also pointed out that when the Fukushima incident occurred, the Japanese government was recommending anyone in an area experiencing 1 μSv/h should either evacuate or seek adequate shelter.

The Sv dosage to decide to leave a shelter would be the same as the one to seek shelter. If you have a means to protect from breathing in radioactive particles, and can adequately decontaminate upon returning. short runs to leave the shelter can be somewhat safe. Long exposure will depend on the local Sv reading. Don't dally.
This is based on information available in a reference manual I keep titled The U.S. Armed Forces Nuclear, Biological and Chemical Survival Manual by Dick Couch, retired Captain, USNR.

When to take iodine would depend on the type of nuclear incident. If from a fission bomb, radioactive iodine is highly likely to be produced. From a fusion reaction, not as likely. Children are more susceptible to the effects of radioactive iodine, and should be given proper dosing first. Then pregnant and breastfeeding mothers should be next on the priority list, as they are nurturing a susceptible baby. Finally, adults are less affected but the situation could dictate that they be administered a dose too. It's hard to know for sure when without knowing the variables in play. Unless you know it should be given, there's some risk with taking it as a precautionary measure "just in case". Some folks are allergic. Others can have gastro distress. Self-medicating isn't recommended unless you've had this chat with your doctor ahead of time and received proper instructions.

If you're keen on reading, the manual I mentioned had a list of online references for more research.
One of particular note was: WMD Army Field Manuals
See less See more
Thanks for the book's name, Kauboy. On order from WallyWorld.
  • Like
Reactions: 1
1 - 5 of 5 Posts