Radiation and Health - Chapter 3 pot

... half-life. Time given in half-lives Activity given in percent After one half-life the intensity of the radiation has decreased to 50%. After two half-lives only 25% remains and so on. Each half-life ... naturally occurring radioactive isotopes, such as U- 238 . For this to occur the half-lives must be very long. We saw in Figure 2 .3 that U- 238 has a half-life of 4.47 billion years. The...

Ngày tải lên: 12/08/2014, 02:23

... cell. © 20 03 Taylor & Francis 134 Radiation and Health Radiation- induced Cancer in Animals A great deal of our knowledge about radiation- induced cancers is from experi- ments on rats and mice. ... dose exists for radiation- induced cancer. © 20 03 Taylor & Francis 142 Radiation and Health Figure 11.5. The figure indicates relative risk for radiation- induced le...

Ngày tải lên: 12/08/2014, 02:23

... t 1/2 Krypton-85 Kr-85 10.7 yr Tellurium-129m Te-129m 33 .6 d Strontium-89 Sr-89 50.5 d Iodine- 131 I- 131 8.04 d Strontium-90 Sr-90 29.1 yr Xenon- 133 Xe- 133 5 .3 d Yttrium-91 Y-91 58.5 d Cesium- 137 Cs- 137 30 .0 ... yr Zirconium-95 Zr-95 64 d Barium-140 Ba-140 12.7 d Technecium-99 Tc-99 2 13, 000 yr Praseodymium-1 43 Pr-1 43 13. 6 d Ruthenium-1 03 Ru-1 03 39 .3 d Neodymium-147 Nd-...

Ngày tải lên: 12/08/2014, 02:23

... kg) the radiation dose will be: D = 3. 3 . 10 -6 J/kg = 3. 3 µGy Conclusion The radiation dose of 3. 3 µGy, or 3. 3 µSv, is surprisingly small. The result shows that the absorption of radiation ... information about the doses from I- 131 but we can try to give a scenario and estimate the doses. Let us assume that I- 131 ente- red the milk supply. I- 131 has a half-life of o...

Ngày tải lên: 12/08/2014, 02:23

... Approach 50 3. 3.2 .3 Analysis 50 3. 3 .3 Mapping the Relationships between Areas of High Conservation Value and Land Managers’ Values and Practices 53 3 .3. 3.1 Context 53 3 .3. 3.2 Approach 53 3 .3. 3 .3 Analysis ... Integrating Social and Biophysical Data 55 N S W E Kilometers 0 – 0.0124 435 33 0.0124 435 33 – 0.024887066 0.024887066 – 0. 037 330 598 0. 037 330...

Ngày tải lên: 18/06/2014, 16:20

... the manufacturer and “exploiter” Engels, and Lenin, the scion of the Russian gentry, were certainly not of proletarian background. But Hitler and Mus- solini were genuine proletarians and spent their ... their fault that ECONOMICS AND THE REVOLT AGAINST REASON 83 undeniable fact. What they really wanted to say was that historical under- standing, aesthetic empathy, and value judg...

Ngày tải lên: 02/07/2014, 13:20

... 921,600 23, 040,000 9,000 35 0 3, 150,000 81,000,000 4,900 186 911,400 24,010,000 4,600 218 1,002,800 21,160,000 8,900 34 7 3, 088 ,30 0 79,210,000 5,900 248 1,4 63, 200 34 ,810,000 5,500 231 1,270,500 30 ,250,000 43, 600 ... and July but utilities were $600 in April and $900 in July, then the average actual utilities cost per unit for April would be $0.20 ($600 Ϭ 3, 000 units) a...

Ngày tải lên: 02/07/2014, 22:21

... season isuniform with a minimum of $35 5, and a maximum of $39 5. The average end-of-season sales price is uniform with a minimum of $175, and a maximum of $195. Table 3. 1 summarizes the Crystal Ball ... The next chapter takes a more in-depth view of selecting and specifying Crystal Ball assumptions. Building a Crystal Ball Model 31 FIGURE 3. 2 Distribution gallery showing the tr...

Ngày tải lên: 05/07/2014, 18:20

... northern Scotland; 29, East Greenland zone; 30 , northern Canada; 31 , west- ern Koryak zone; 32 , Innuitian Belt; 33 , northwestern Alaska; 34 , southern Cordillera zone; 35 , South Oklahoma zone; 36 , Appalachian ... Cambrian- Ordovician boundary. Geological Maga- zine 125 :36 3 38 0. Shergold, J. H., J. Jago, R. Cooper, and J. Lau- rie. 1985. The Cambrian System in Aus- tralia, An...

Ngày tải lên: 06/07/2014, 21:20

... EM120 has 191 Bathymetry - 2  WWII - U.S. Navy further developed SONAR technology – knowledge of the enemy – knowledge of the ocean  1950’s - 1960’s - single, focused high- frequency, short wavelength ... (ROVs) – submersibles multiple, focused, high-frequency, short wavelength sound beams Multibeam Multibeam Movies courtesy of NOAA Bathymetry - 3  1970’s - re...

Ngày tải lên: 21/07/2014, 18:20