Ionization Chamber Vs Geiger Counter3/24/2021
Dont assume Geiger counters, at least those with internal or hotdog probes, dont measure radiation energy- Most (and all of the CDV-700s) have a compensated probe cover that adds additional filtering of low energy gammas, so the output is proportional to energy (ie, measurement in mRhr, not counts per minute.) But for a prepper, such a meter is typically is used to make relative meansurments and detect contamination.
![]() ![]() From this I understand somewhat that: - Ion Chamber instruments to me sounds like they determine the dosage in relation to tissue radiation over time better than Geiger Counters. Geiger counters might not be that effective due to their build, and not take in consideration the energy output from decay (even though they do have the same dosage unit). Although they are better suited in order to detect hotspots of radiation. Geiger counters come with different ranges, low level and high level. There seems to be a breaking point at around 100-200 mRh for most systems, meaning that an area of a high radiation will not be measured accurately, and will only show maximum radiation for that specific Geiger counter. ![]() Levels above 100-200mRHour would mean the simpler systems are pegged and does not show the real value, thus it could be much worse. On the other hand, if radiation level is above 100-200 then you are quite buggered anyway. Would you say that a low-level Geiger Counter is better Last question is regarding Geiger Counters measuring Alpha particles. Most GM seem to have limitations, only detecting Gamma and Beta and excluding the Alpha, but some have that possibility. Ionization Chamber Vs Geiger Counter Skin And ClothesIf I want to be able to survey an area, people and maybe even food that has been exposed to fallout, should I invest in an Geiger Counter that can measure Alpha particles or would I feel comfortable knowing that most fallout dust would also emit some Beta and Gamma radiation I am very well aware that Alpha particles are less dangerous on skin and clothes, however very potent when ingested. Is there a risk that fallout dust on food for instance, would be exclusively Alpha and without traces of Beta and Gamma decay Many thanks for any input. And please, lets keep it as civil as possible even though we all might have different opinions. There are however, GM meters that go up to 1000Rhr ( the digital verson of a Ludlam 5.) For a RDD (dirty bomb) a gieger counter is fine. I cant see a need for one at home (unless you live downtown), but it might be useful in a car or office if you initally decide to shelter in place. For a nuclear bomb, and ion chamber is prefered, though a low range meter like the CDV-700 is good for decon. The ion chamber (or a GM reading at least 1Rhr) can be used to determine when to leave shelter. The higher ranges (up to 100Rhr are need if you need to make a quick exit (100Rhr would allow a one time brief exposure (less than an hour, but ideally less then 5 minutes) to do something very valuable.) For a nuclear bomb (nuclear, thermonuclear or IND) an alpha probe is about useless- the fallout will contain a mix of isotopes. Also a alpha probe may help decon as it will be less sensitive to background radiation. Remember, while alpha particals dont penetrate the skin, they can be deadly if ingested or inhaled, and are dangerious on the surface of the skin (saying they dont penetrate the skin is saying they expend all of their energy in the skin- or other tissue.).
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