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Apr 3 2009, 2:58 PM EDT
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Change: It is the only synthetic element that has found its way into households. There is one type of common smoke detector that contains a small amount of the substance, only .2 micrograms. (12)Links:Decay Radiation SearchX-Ray Mass Attenuation Coefficientshttp://en.wikipedia.org/wiki/AmericiumReferences:1. Radioiactive Material Safety
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Apr 3 2009, 2:24 PM EDT
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Change: It was the fourth transuranic element to be discovered. (12)Created by bombarding Plutonium-239 with high energy neutrons to create Plutonium-240. Plutonium-240 is bombarded with high energy neutrons to create
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Mar 30 2009, 10:16 PM EDT
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Change: There are tests that reliably measure the amount of americium in a urine sample, even at very low levels. Using these measurements, scientists can estimate
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Mar 30 2009, 9:19 PM EDT
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Change: 4 mSv over the balance of the pregnancy (1) QA: Always use the principles of time, distance and shielding to minimize dose Engineering Controls: Sealed radioactive sources used in industrial applications should always be within a protective source housing to minimize radiation dose and to protect the source capsule from
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Mar 24 2009, 1:27 PM EDT
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Change: It is one of the nine reactor produced isotopes that is at risk of being used in bombs for terrorist attacks. (12)Links:Decay Radiation SearchX-Ray Mass Attenuation Coefficientshttp://en.wikipedia.org/wiki/AmericiumReferences:1. Radioiactive Material Safety Data Sheet. Available at: http://www.safety.uncc.edu/Forms/Nuclide%20Safety%20Data%20Sheets%20NIH/Americium%20241.pdf. Accessed March 15, 2009.2. Americum.
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Mar 24 2009, 1:21 PM EDT
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Change: 21 2009.10. Yahoo Answers. Ask.Answer.Discover. Available at: http://answers.yahoo.com/question/index?qid=20070217085004AAgZR9y. Accessed March 21,2009 11.Perez, Carlos A., Halperin, Edward C., Brady, Luther W., Schmidt-Ullrich, Rupert K.. Principles and Practice of Radiation Therapy, Fourth Edition. Lippincott Williams & Wilkins. 2004. pg 479-480.Color code:FrancineMat C.. . .
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Mar 23 2009, 11:14 PM EDT
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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Mar 21 2009, 10:09 PM EDT
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Change: used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take for 43.0 % of an expertAm-241 sample to decay? Use the formulaA=Pe^(-rt)and r=ln2/halflifer=ln2/432=0.0016Let P(the starting amount) be equal to 100If 43%
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Mar 21 2009, 9:51 PM EDT
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Change: (Radiation detectors will detect americium-241. Most detection will be based on detection of the 59.5 keV gamma). 1. A radiation survey meter equipped with an energy-compensated Geiger Mueller detector.2. Ion chamber survey meter – tends to be less sensitive than a Geiger Mueller survey meter but is
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Mar 21 2009, 9:42 PM EDT
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Change: the source after it has dried or by measuring the radioactivity in the residue obtained by evaporation of the water in which the source was immersed. (e) Dry wipe test. On completion of the preceding test in this section, the dry wipe test described in paragraph (b) of this section
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Mar 21 2009, 9:08 PM EDT
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Change: Accessed March 17, 2009.6. Americum Images. Available at:www.impcas.ac.cn/.../prc/radiation_types.html.Accessed March 17, 2009.7. Analog. Gamma Ray Detector Calibration. Available at: http://www.logwell.com/tech/nuclear/GR_cal.html. Accessed on March 21, 2009. 8. Princeton University. Contained Source Radiation. Available at:http://web.princeton.edu/sites/ehs/ContainedSources/AmBeSource/ambesource.htm. Accessed on March 21,2009.Color code:FrancineMat C..
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Mar 21 2009, 8:42 PM EDT
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Change: tissues. Am-241 emits both alpha and gamma radiation (alpha radiation is utilized in AmBe "chemical" neutron sources), but here we are interested in low energy or "soft" gamma rays. Am-241 produces 59.5 keV gammas with a 36% probability of decay, and 14 keV gammas with a 43% probability of decay.(7)
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Mar 20 2009, 12:45 AM EDT
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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Mar 20 2009, 12:43 AM EDT
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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Mar 20 2009, 12:42 AM EDT
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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Mar 20 2009, 12:39 AM EDT
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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Mar 20 2009, 12:37 AM EDT
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Change: Thanks for taking the time to look into my question. I'll clarify. I need the exposure rate in mR/hr for a 500 mCi 241Am source at a distance of 30 feet.
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Mar 20 2009, 12:31 AM EDT
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Change: MeV Mev Intensity Photons/s Photons/s-cm2at 914.4 cm Attenuated Photons/s-cm2 Photons Absorbed/s-cm3 MeV/s-cm3 0.0139 0.370 7.90E+09 7.52E+02 117 0.219845 0.003056 0.0263 0.024 4.44E+084.44+08 4.23E+014.23+01 32 0.00854 0.000225 0.0595 0.359 6.64E+096.44E+09 6.32E+026.32+02 617 0.022544 0.001341 The photons/s value for each energy is
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Mar 20 2009, 12:22 AM EDT
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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Mar 18 2009, 9:39 PM EDT
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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