1 Bq = 1 disintegration/second 1 Gy = 100 rad 1 Sv = 100 rem 1 rad = about 1 rem 1 roentgen = 0.876 rad 14 microroentgen (µR) = 0.00001217 rad Tecopa/Shoshone California Monthly Summary for October, 2013 Gamma Radiation Max. 14 µR/h 14 microroentgen (µR) = 0.014 milliroentgen (mR) 0.014 milliroentgen (mR) = 0.000014 roentgen (R) An exposure of 500 roentgens in five hours is usually lethal for human beings. The typical exposure to normal background radiation for a human being is about 200 milliroentgens per year, or about 23 microroentgens per hour. 100 milliroentgen = 0.08696 rad * 2 = 200 milliroentgen = 0.17392 rad Massachusetts has prescribed that the whole body exposure to gamma rays shall be mantained at less than 0,1 rem per eight-hour day. These effects are lessened considerably if the dose is received over a long period of time. A short-term dose of 600 roentgens would probably be fatal, but if the exposure were gradually acquired over a much longer period (months to years) it would probably have no noticeable effects. For instance, if a persons total dose is 200 roentgens for the first month, 25 roentgens per week for the next 5 months, and 10 roentgens per week thereafter for the next 6 months, they would have little if any radiation sickness. The body will heal and repair some of the damage if the exposure is received gradually, allowing larger total doses, condensed from a 1967 Defense Department shelter management textbook.
Posted on: Sun, 17 Nov 2013 04:31:23 +0000
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