Ramanisblog

Tag: Radiation

2) Take readings in your area.
3) Post readings to RDTN.

 

While we hope to gather data via our own website, we recognize the efforts of others out there who are actively seeking and parsing data and making it available for others to use.

 

We are aware that reliable data is critical, and have carefully chosen partners in supplying information. Our map is populated with data from Pachube andMarian Steinbach. . As more reliable data sources become available, we will consider adding further sources to the site.

 

We’d like to thank those other sites and individuals who are providing data (for this site and others):

  • Pachube.com
  • Marian Steinbach
  • GeigerCrowd.net
  • The Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
  • http://current.com/12ggp4c
  • http://www.pachube.com/

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    Find images,Satellite images  in the Link above.

     

     

  • Online Geiger Counter Nuclear Radiation Detector Map

    Readings are in uR/hr for Cs137/Co60
    Only detectors with readings in the last 24 hours are displayed

    Click Link Below to operate the Geiger Counter.

    http://www.blackcatsystems.com/RadMap/map.html

    Note that these are generally run by individuals, and not all readings may be accurate. Do not panic because you see a high reading. Someone could be getting invalid readings.
    Treat this for information purposes only, do not make safety decisions based upon it.

    Today is: 2011-03-18, and the time is 05:16:12 UTC.
    This page will automatically refresh every 15 minutes.

    Are your friends panicked by media coverage of the event? Share this page so they can see things are normal.

    Typical background radiation levels for most of the USA are in the 5 to 28 uR/hr range. Readings can be higher for brief periods of time due to normal variations in radiation levels. They can also be consistently higher for areas at high elevations, or with larger natural deposits of uranium, thorium, radon, etc.

    The readings on this page were obtained using one of the Black Cat Systems radiation detectors:

    The detector is connected to an ordinary computer (Windows or Macintosh) running a copy of the Rad software and connected to the internet (dialup, cable modem, dsl, etc). Rad automatically sends the current radiation reading to the web server that hosts this site, which generates the map showing the readings for all radiation monitoring stations. Rad is included free with any of our radiation detectors.

    Users of our detectors are welcome to add their site to the map. Contact us at info (at) blackcatsystems (dot) com for details on how.

    A geiger counter lets you check the environment and items for radioactivity. You can use to check for the presence of radon on your house or basement, or even use it to go prospecting for uranium or other radioactive minerals. The GM-10 and other members of the geiger counter family can detect radioisotopes such as Polonium 210 which was used to poison Alexander Litvinenko.

    A geiger counter works by detecting the ionization produced by a radioactive particle. Each time a particle of radiation is detected, the counter records this event. The number of events recorded over a period of time indicates the amount of radiation present. Often this is done over one minute intervals, resulting in the familiar “counts per minute” or CPM. The higher the CPM, the higher the radiation levels. You can read a more in depth description of how geiger counters work.

    Radiation decay is a random event. That means that if the average reading is say 16 CPM, it will not remain a steady 16, but will bounce up and down. This is normal. The standard deviation is the square root of the average value, and the typical maximum range is plus or minus 3 standard deviations.

    So, using the above example, the square root of 16 is 4, so the standard deviation is 4. 3 times 4 is 12. So we would expect the readings to be 16 +/- 12, or range from 4 to 28. That is to say, even if the radiation levels are a “constant” 16, the apparent readings of the geiger counter will range between 4 and 28. So if you suddenly see the reading jump from 16 to 25, that does necessarily not mean that the radiation level has increased.

    There is a writeup about Counting Statistics available.

    Radioactivity is the emission of energy from the nucleus of certain nuclides or elements. Some naturally occuring radioactive elements include uranium and thorium and radon. A small amount of naturally occuring potassium is even radioactive.

    There are three types of radioactive emissions:

    • Alpha – the least penetrating form of radiation, can be stopped with a piece of paper or a few inches of air. Alpha rays are the nucleus of a helium atom, and are produced by certain radiactive materials such as thorium and uranium.
    • Beta rays are more penetrating than alpha rays, and can be stopped by a few millimeters of aluminum or other metals. They are very fast moving electrons.
    • Gamma rays are the most penetrating form of radiation. Depending on their energy, they can travel through up to several inches of steel, and hundreds of feet of air. They are usually produced in conjunction with either alpha or beta rays.

    You may be interested in Information on Radiation Units and Background Radiation Levels

    We also have an interesting page about Radioactive Products and Other Sources Of

    Radiation

     

    Related:

  • Check Radiation Poisoning.

    Phase Symptom Exposure (Sv)
    1–2Sv 2–6Sv 6–8Sv 8–30Sv >30Sv
    Immediate Nausea and vomiting 5–50% 50–100% 75–100% 90–100% 100%
    Time of onset 2–6h 1–2h 10–60m <10m immediate
    Duration >24h 24–48h <48h <48h 48h–death
    Diarrhea None Slight (10%) Heavy (10%) Heavy (90%) Heavy (100%)
    Time of onset — 3–8h 1–2h >1h <30m
    Headache Slight Mild (50%) Moderate (80%) Severe (80–90%) Severe (100%)
    Time of onset — 4–24h 3–4h 1–2h <1h
    Fever Slight–None Moderate (50%) High (100%) Severe (100%) Severe (100%)
    Time of onset — 1–3h >1h >1h >30m
    CNS function No impairment Cognitive impairment 6–20 h Cognitive impairment <20 h Rapid incapacitation Seizures,Tremor, Ataxia
    Latent Period 28–31 days 7–28 days >7 days none none
    Overt illness MildLeukopenia;
    Fatigue;
    Weakness    		 Leukopenia;
    Purpura;
    Hemorrhage;
    Infections;
    Epilation    		 Severe leukopenia;
    High fever;
    Diarrhea;
    Vomiting;
    Dizziness and disorientationHypotension;
    Electrolyte disturbance    		 Nausea;
    Vomiting; Severe diarrhea;
    High fever;
    Electrolyte disturbance;
    Shock    		 Death
    Mortality without medical care 0–5% 5–100% 95–100% 100% 100%
    Mortality with medical care 0–5% 5–50% 50–100% 100% 100%

    [7][10

    Japanese authorities are trying to prevent total meltdown at three nuclear reactors that were damaged in Friday’s tsunami. Engineers are flooding the reactors to cool them down, then venting the radioactive steam to prevent a dangerous build-up in pressure. Thousands have been evacuated, and helicopters have detected radioactive particles 60 miles from the reactors. How can the evacuees tell if they’ve been exposed to dangerous levels of radiation?

    With a blood test. Nuclear plant workers, radiologists, and rescue workers can wear badges or special rings that tell them how much radiation is in their environment. Post hoc measurement is tougher, though. Public health workers may pass a device over the patient’s clothing. The air enters an oxygen- or argon-filled chamber, and the machine detects reactions between the gas and radioactive particles. Another option is to take a swab of the patient’s nose and mouth and perform a similar experiment. If either of these methods uncover radiation exposure, doctors then draw blood. Absorption of more than 500 millisieverts of radiation can depress white blood cell levels.

    At this time, it doesn’t look like anyone in Japan has taken in this much radiation. The highest reported absorption so far is just 106 msv. To put that into perspective, workers at the Chernobyl plant absorbed more than 5,000 msv, and those were the survivors. Even 500 msv is fairly benign. White blood cell counts typically rebound within a couple of days, and the patient’s increased lifetime risk of cancer is barely worth mentioning. The average American has a one-in-two chance of developing some form of cancer. One-time exposure to 500 msv raises those odds to about one-in-1.9999.

    On the off chance that an unfortunate nuclear plant worker shows signs of significant radiation exposure, treatment would depend on the type of radioactive particle involved. Radioactive cesium can be treated with a chelating agent, a chemical that binds to the particle and ushers it out of the body via urine. Those who inhale a dose of radioactive iodine aren’t as lucky. While it can be treated prophylactically with potassium iodide tablets, there’s no effective remedy after the exposure. The victim has to wait for his body to process the contaminant.

    http://www.slate.com/id/2288228/

    Related:

    Radiation Exposure Monitoring (REM) facilitates the collection and distribution of information about estimated patient radiation exposure resulting from imaging procedures.

    http://wiki.ihe.net/index.php?title=Radiation_Exposure_Monitoring

    Radiation poisoning, radiation sickness or a creeping dose, is a form of damage to organ tissue caused by excessive exposure to ionizing radiation. The term is generally used to refer toacute problems caused by a large dosage of radiation in a short period, though this also has occurred with long term exposure. The clinical name for radiation sickness is acute radiation syndrome (ARS) as described by the CDC.[1][2][3] A chronic radiation syndrome does exist but is very uncommon; this has been observed among workers in early radium source production sites and in the early days of the Soviet nuclear program. A short exposure can result in acute radiation syndrome; chronic radiation syndrome requires a prolonged high level of exposure.

    Radiation exposure can also increase the probability of developing some other diseases, mainlycancer, tumours, and genetic damage. These are referred to as the stochastic effects of radiation, and are not included in the term radiation sickness.

    The use of radionuclides in science and industry is strictly regulated in most countries. In the event of an accidental or deliberate release of radioactive material, either evacuation or sheltering in place are the recommended measures. For information on the effects of lower doses of radiation, see the article on radiation orders of magnitude.

    Exposure levels

    A gray (Gy) is a unit of radiation dose absorbed by matter. To gauge biological effects the dose is multiplied by a ‘quality factor’ which is dependent on the type of ionising radiation. Such measurement of biological effect is called “dose equivalent” and is measured in sievert (Sv). For electron and photon radiation (e.g. gamma), 1 Gy = 1 Sv.

    The corresponding non-SI units are the rad (radiation absorbed dose; 1 rad = 0.01 Gy), and rem (roentgen equivalent mammal/man;[8]1 rem=0.01 Sv).

    Annual limit on intake (ALI) is the derived limit for the amount of radioactive material taken into the body of an adult worker by inhalation or ingestion in a year. ALI is the intake of a given radionuclide in a year that would result in:

    • a committed effective dose equivalent of 0.05 Sv (5 rems) for a “reference human body”, or
    • a committed dose equivalent of 0.5 Sv (50 rems) to any individual organ or tissue,

    whatever dose is the smaller.[9

    Signs and symptoms

    Radiation sickness is generally associated with acute (a single large) exposure.[4][5] Nausea and vomiting are usually the main symptoms.[5]The amount of time between exposure to radiation and the onset of the initial symptoms may be an indicator of how much radiation was absorbed,[5] as symptoms appear sooner with higher doses of exposure.[6] The symptoms of radiation sickness become more serious (and the chance of survival decreases) as the dosage of radiation increases. A few symptom-free days may pass between the appearance of the initial symptoms and the onset of symptoms of more severe illness associated with higher doses of radiation. Nausea and vomiting generally occur within 24–48 hours after exposure to mild (1–2 Sv) doses of radiation. Radiation damage to the intestinal tract lining will cause nausea, bloody vomiting and diarrhea. This occurs when the victim’s exposure is 200 rems (1 Sv = 100 rems) or more. The radiation will begin to destroy the cells in the body that divide rapidly, including blood, GI tract, reproductive and hair cells, and harm the DNA and RNA of surviving cells. A direct quantitative relationship exists between the degree of the neutropenia that develops after exposure to radiation and the increased risk of developing systemic infection (sepsis). Headache, fatigue, and weakness are also seen with mild exposure.[7] Moderate (2–3.5 Sv of radiation) exposure is associated with nausea and vomiting beginning within 12–24 hours after exposure.[7] In addition to the symptoms of mild exposure, fever, hair loss, infections, bloody vomit and stools, and poor wound healing are seen with moderate exposure. Nausea and vomiting occur in less than 1 hour after exposure to severe (3.5–5.5 Sv) doses of radiation, followed by diarrhea and high fever in addition to the symptoms of lower levels of exposure. Very severe (5.5–8 Sv of radiation[citation needed]) exposure is followed by the onset of nausea and vomiting in less than 30 minutes followed by the appearance of dizziness, disorientation, and low blood pressure in addition to the symptoms of lower levels of exposure. Severe exposure is fatal about 50% of the time. Severe sepsis is the cause of death in most cases. See criticality accident for a number of incidents in which humans have been accidentally exposed to such levels of radiation.

    Longer term exposure to radiation, at doses less than that which produces serious radiation sickness, can induce cancer as cell-cycle genes are mutated. The probability cancer will develop is a function of radiation dose. In radiation-induced cancer the disease, the speed at which the condition advances, the prognosis, the degree of pain, and every other feature of the disease are not functions of the radiation dose to which the person is exposed.

    Since tumors grow by abnormally rapid cell division, the ability of radiation to disturb cell division is also used to treat cancer (seeradiotherapy), and low levels of ionizing radiation have been claimed to lower one’s risk of cancer (see hormesis).

    Organisms causing sepsis

    The systemic infections can be endogenous originating from the oral and gastrointestinal bacterial flora, and exogenous originating from a breached skin and environment following trauma.

    The organisms causing endogenous infections are generally Gram negative bacilli such as Enterobacteriacae (i.e. Escherichia coli, Klebsiella pneumoniae, Proteus spp.), Pseudomonas aeruginosa, and Enterococcus spp. (of gastrointestinal origin) and Streptococcus spp. (of oral cavity source).

    Exposure to higher doses of radiation is often associated with anaerobic infections due to Gram negative bacilli and gram positive cocci. Fungal infections can also emerge in those who fail antimicrobials and are still febrile for over 7-10 days.

    Exogenous infections can be caused by organisms that colonize the skin such as Staphylococcus aureus or Streptococcus spp. and organisms that are acquired from the environment such as Pseudomonas spp.

    http://en.wikipedia.org/wiki/Radiation_poisoning#Exposure_levels