reply to post by Partygirl
IT sats "MC" in a circle and the number is "RM-2021". The maker is Chinese. All the writing on it is in chinese.
Apparently this model is fairly common in Japan after the quake.
Getting low readings today. 0.6 uSv/h inside just now as I type this.
Okay, thank you for this information... It appears that the model that you have, only measures Electromagnetic Radiation (X-Rays, Gamma Rays), and
does not measure Alpha, Beta, or Neutron Radiation.
A Brief primer on each.....
Alpha radiation is basically the ejection of a hydrogen nucleus (2 protons, 2 neutrons)
Beta radiation is the ejection of a high energy electron
Neutron radiation is the ejection of a.... well... neutron...
The most common sources of radiation from the fukushima release are Iodine-131, and Caesium-137, and they break down as follows:
Iodine-131 has 2 possible decay paths:
1. Releasing a 333.8 KeV Electron, and then a 636.9 KeV Gamma ray (7.17% of the time)
2. Releasing a 606.3 KeV Electron, and then a 364 KeV Gamma Ray (81.7% of the time)
And Caesium-137 also has two possible decay modes:
1. Releasing a 0.512 MeV Electron, and then releasing a 0.6617 MeV Gamma Ray (94.6% of the time)
2. Releasing a 1.174 MeV Electron. (5.4% of the time)
For a common source of reference: Potassium-40 (Which is naturally occurring and in your body throughout your entire life) has three possible decay
1. Releasing a 1.33 MeV Electron (89.28% of the time)
2. Capturing an Electron, and Releasing a 1.460 MeV gamma ray. (10.72% of the time)
3. Releasing a positron. (0.001% of the time)
Now, keep in mind, there are at any given time, 4,000 decays per second taking place in your body from Potassium-40... so this should give you a good
idea as to the normal amount of energy that your body is subject to.
So, it looks like, on average, your dosimeter isn't going to be that far off from the actual amount of radiation released from any potential
by-products of the release at Fukushima.
edit on 27-4-2012 by ErtaiNaGia because: (no reason given)