Acute and Chronic Radiation Syndrome Tables for Human Beings and Electronics

Radioactive contamination of an area is measured by a "swipe" or "smear" survey. A small piece of absorbent paper is rubbed over a 100 square centimeter area in a S-shaped pattern. A radiation detector then is used on the paper to measure the disintegrations per minute (dpm). Depending on the standard used, an area is considered "contaminated" if the dpm is above 100 - 500.
Notes:
1- In case you are researching, you may run across the terms "rem" and "rad." These are sort of obsolete terms. One Sievert equals 100 rems. One Gray equals 100 rads.
2- In case you have been attacked by Iran, check your Immediate symptoms first in order to know the dose you are contaminated (I should not be teasing this subject).



Acute Radiation Syndrome Table

Dose (Grays): 1.0<
Immediate symptoms: Mild nausea
Latent phase: days to weeks
Post-latent symptoms: In this dose range no obvious sickness occurs. Detectable changes in blood cells begin to occur at 0.25 Sv, but occur consistently only above 0.50 Sv. These changes involve fluctuations in the overall white blood cell count (with drops in lymphocytes), drops in platelet counts, and less severe drops in red blood cell counts. These changes set in over a period of days and may require months to disappear. They are detectable only by lab tests. At 0.50 Sv atrophy of lymph glands becomes noticeable. Impairment to the immune system could increase the susceptibility to disease. Depression of sperm production becomes noticeable at 0.20 Sv, an exposure of 0.80 Sv has a 50% chance of causing temporary sterility in males. At 0.75 Sv there is a 10% chance of nausea.
Prognosis: Almost certain survival

Dose (Grays): 1.0~2.0
Immediate symptoms: Mild acute symptoms occur in this range. Symptoms begin to appear at 1 Sv, and become common at 2 Sv. Typical effects are mild to moderate nausea (50% probability at 2 Sv) , with occasional vomiting, setting in within 3-6 hours after exposure, and lasting several hours to a day.
Latent phase: 10 - 14 days
Post-latent symptoms: Tissues primarily affected are the hematopoietic (blood forming) tissues, sperm forming tissues are also vulnerable. Blood changes set in and increase steadily during the latency period as blood cells die naturally and are not replaced. There is a 10% chance of temporary hair loss. Mild clinical symptoms return in 10-14 days. These symptoms include loss of appetite (50% probability at 1.5 Sv), malaise, and fatigue (50% probability at 2 Sv), and last up to 4 weeks. Recovery from other injuries is impaired and there is enhanced risk of infection. Temporary male sterility is universal. The higher the dosage in this range, the more likely the effects, the faster symptoms appear, the shorter the latency period, and the longer the duration of illness.
Prognosis: Fatality rate is about 10%

Dose (Grays): 2.0~3.5
Immediate symptoms: Nausea becomes universal (100% at 3 Sv), the incidence of vomiting reaches 50% at 2.8 Sv. Nausea and possible vomiting starting 1 to 6 hours after irradiation and lasting up to 2 days
Latent phase: 7 - 14 days
Post-latent symptoms: Illness becomes increasingly severe, and significant mortality sets in. Hematopoietic tissues are still the major affected organ system. When symptoms recur, the may include epilation (hair loss, 50% probability at 3 Sv), malaise, fatigue, diarrhea (50% prob. at 3.5 Sv), and hemorrhage (uncontrolled bleeding) of the mouth, subcutaneous tissue and kidney (50% prob. at 4 Sv). Suppression of white blood cells is severe, susceptibility to infection becomes serious. At 3 Sv the mortality rate without medical treatment becomes substantial (about 10%). The possibility of permanent sterility in females begins to appear. Recovery takes 1 to several months.
Prognosis: Fatality rate 35% to 40%

Dose (Grays): 3.5~5.5
Immediate symptoms: Nausea and vomiting within half an hour, lasting up to 2 days
Latent phase: 7 - 14 days
Post-latent symptoms: Hair loss, internal bleeding, severe bone marrow damage with high risk of bleeding and infection. Hemopoietic Syndrome. Mortality rises steeply in this dose range, from around 50% at 4.5 Sv (LD50) to 90% at 6 Sv (unless heroic medical intervention takes place). Hematopoietic tissues remain the major affected organ system. The symptoms listed for 2.0-3.5 Sv increase in prevalence and severity, reaching 100% occurrence at 6 Sv. When death occurs, it is usually 2-12 weeks after exposure and results from infection and hemorrhage. Recovery takes several months to a year, blood cell counts may take even longer to return to normal. Female sterility becomes probable.
Prognosis: Fatality rate 50% within 6 weeks

A Break for You to Breathe

Dose (Grays): 5.5~7.5
Immediate symptoms: Severe nausea and vomiting within 15 - 30 minutes, lasting up to 2 days
Latent phase: 5 - 10 days
Post-latent symptoms: Hair loss, internal bleeding, severe bone marrow damage leading to complete failure of blood system, high risk of infection, moderate gastrointestinal damage. Gastrointestinal Syndrome. Survival depends on stringent medical intervention. Bone marrow is nearly or completely destroyed, requiring marrow transfusions. Gastrointestinal tissues are increasingly affected. The final phase lasts 1 to 4 weeks, ending in death from infection and internal bleeding. Recovery, if it occurs, takes years and may never be complete.
Prognosis: Death probable within 3 weeks

Dose (Grays): 7.5~10
Immediate symptoms: Excruciating nausea and vomiting within 5 - 15 minutes, lasting for several days
Latent phase: 5 - 7 days
Post-latent symptoms: Hair loss, internal bleeding, severe bone marrow damage leading to complete failure of blood system, high risk of infection, severe gastrointestinal damage.
Prognosis: Death almost certain within 3 weeks. Complete recovery impossible.

Dose (Grays): 10~20
Immediate symptoms: Immediate nausea occurs due to direct activation of the chemoreceptive nausea center in the brain. The onset time 5 minutes.
Latent phase: 5 - 7 days
Post-latent symptoms: Very high exposures can sufficient metabolic disruption to cause immediate symptoms. Above 10 Sv rapid cell death in the gastrointestinal system causes severe diarrhea, intestinal bleeding, and loss of fluids, and disturbance of electrolyte balance. These effects can cause death within hours of onset from circulatory collapse. Following an initial bout of severe nausea and weakness, a period of apparent well-being lasting a few hours to a few days may follow (called the "walking ghost" phase). This is followed by the terminal phase which lasts 5 - 12 days. In rapid succession prostration, diarrhea, anorexia, and fever follow. Death is certain, often preceded by delirium and coma. Therapy is only to relieve suffering.
Prognosis: Certain death

Dose (Grays): 20~80
Immediate symptoms: Immediate disorientation and coma will result, onset is within seconds to minutes.
Latent phase: None
Post-latent symptoms: CNS Syndrome. Metabolic disruption is severe enough to interfere with the nervous system. Convulsions occur which may be controlled with sedation. Victim may linger for up to 48 hours before dying.
Prognosis: Certain death

Dose (Grays): > 80
Immediate symptoms: Coma
Latent phase: None
Post-latent symptoms: The U.S. military assumes that 80 Sv of fast neutron radiation (from a neutron bomb) will immediately and permanently incapacitate a soldier. Lethal within 24 hours due to damage to central nervous system.
Prognosis: Certain death

Note: Sorry, there is no information available about symptoms of radiation on pets.

Chronic Radiation Syndrome Table

General Public
30-day limit 0.0004 Sieverts (0.4 milli-Sieverts)
annual limit Adult: 0.05 Sieverts, Minor: 0.005 Sieverts
career limit N/A
accident limit 0.25 Sieverts
acute limit N/A

Occupational Workers
30-day limit 0.4 milli-Sieverts
annual limit 0.05 Sieverts
career limit 0.05 x (age in years-18) Sieverts
accident limit 1 Sievert
acute limit N/A

Note: for a pregnant woman it is 0.005 Sievert total for the duration of the pregnancy.

Electronics are also vulnerable to radiation (including particle beam weapons) due to mechanical disruption, as you can see from Christopher Thrash's notes.
Anthony Jackson says:
"Modern rad-hardened electronics can survive a few hundred to a few thousand grays, and will generally continue functioning until destroyed; non-hardened electronics won't handle even one gray very well, and will crash more or less instantly. In general, more advanced chips, because they have smaller circuits, are more vulnerable to radiation than more primitive designs (sample of a modern rad-hard CPU. Note that it is only guaranteed up to 200 grays, and is 4-5 years behind a modern CPU)."
Source: http://www.projectrho.com/rocket/rocket3ah.html
Check http://www.bt.cdc.gov/radiation/index.asp for emergencies.