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The related quantities LD 50 /30 or LD 50 /60 are used to refer to a dose that without treatment will be lethal to 50% of the population within (respectively) 30 or 60 days. These measures are used more commonly within radiation health physics , for ionizing radiation , as survival beyond 60 days usually results in recovery.
The median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 (lethal concentration and time) of a toxin, radiation, or pathogen is the dose required to kill half the members of a tested population after a specified test duration.
It may specifically refer to the radiation dose required to achieve a 50% tumor ... LD 50, is the dose required to kill half the members of a tested population ...
LD 50 (actually LD 50/60) in humans from radiation poisoning with medical treatment estimated from 480 to 540 rem. [20] 5,000 5 × 10 ^ 3: Acute-Calculated from the estimated 510 rem dose fatally received by Harry Daghlian on August 21, 1945, at Los Alamos and lower estimate for fatality of Russian specialist on April 5, 1968, at Chelyabinsk-70 ...
Whole body LD 50 for acute radiation syndrome in humans 1 krad: Whole body LD 100 for acute radiation syndrome in humans [6] 1–20 krad: Typical radiation tolerance of ordinary microchips 4–8 krad: Typical radiotherapy dose, locally applied 10 krad: Fatal whole-body dose in 1964 Wood River Junction criticality accident [7] 1 Mrad:
A whole-body acute exposure to 5 grays or more of high-energy radiation usually leads to death within 14 days. LD 1 is 2.5 Gy, LD 50 is 5 Gy and LD 99 is 8 Gy. [10] The LD 50 dose represents 375 joules for a 75 kg adult.
Radiation fluence is the number of radiation particles impinging per unit area per ... it takes between 22 and 34 seconds to accumulate a median lethal dose (LD 50 /30).
The median lethal dose (LD 50) for acute radiation exposure is about 4.5 Sv. [86] The committed effective dose equivalent 210 Po is 0.51 μSv/Bq if ingested, and 2.5 μSv/Bq if inhaled. [87] A fatal 4.5 Sv dose can be caused by ingesting 8.8 MBq (240 μCi), about 50 nanograms (ng), or inhaling 1.8 MBq (49 μCi), about 10 ng.