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A 65-kg person is accidentally exposed for 240 s to a 15-mCi source of beta radiation coming from a sample of 90Sr.
(a) What is the activity of the radiation source in disintegrations per second? In becquerels?
(b) Each beta particle has an energy of 8.75 X 10-14 J, and 7.5% of the radiation is absorbed by the person. Assuming that the absorbed radiation is spread over the person's entire body, calculate the absorbed dose in rads and in grays.
(c) If the RBE of the beta particles is 1.0, what is the effective dose in mrem and in sieverts?
(d) How does the magnitude of this dose of radiation compare with that of a mammogram (300 mrem)?
Question- State the number of electron groups, lone pairs, and use VSEPR theory to determine the shape of the following molecules or ions.
A solution containing 10.mmol of CO3^-2 and 5.0 mmol. Of HCO3- is titrated with 1.0M HCL What total volume of HCL must be added to reach the second equivalence point?
Calculate the percent by mass of the solute CH2Cl2 in a solution made by mixing 453 mL of methylene chloride to 2.36 L of the solvent acetone
A voltaic cell consists of a Zn/Zn^2 + half-cell and a Ni/Ni^2 +half-cell at 25C. The initial concentrations of Ni^2 + and Zn^2 + are 1.70 M and 0.100 M, respectively.
A nonvolatile nonelectrolyte compound having a molar mass equals to 18000 g/mol is dissolved to give 100 mL aqueous solution that has an osmotic pressure equals to 26 mmHg at 27oC. The mass (in g) of this compound dissolved in this solution is: A)..
a solution is prepared by mixing 50.0 ml of 0.50 m pbno32 with 50.0 ml of 1.7 m kcl. calculate the concentrations of
what is the molar concentration of a solution prepared by dissolving 0.100 moles of potassium nitrate in enough water
Calculate the heat in joules when 89.19 g of ice at 100.0 K is turned into liquid water at 10.0 degrees Celsius.
In a closed 1.00 L flask, 2.60 atm of CO reacts with 5.80 atm of O2 according to the equation below. Assuming that the temperature remains constant, what is the final pressure in the flask?
Boyle's Law In the mid 1600s, the Irish chemist Robert Boyle carried out experments that determined the quantitative relationship between the pressure and volume of a gas. His data showed that for gas at a constant temperature, pressure and volume..
Suppose you performed a distillation of a solution containing 1-pentanol (C5H12O), 2-pentanol (C5H12O), 3-pentanol (C5H12O), and methyl alcohol (CH4O).
Write electron configurations for each of the following elements. Use the symbol of the previous noble gas in brackets to represent the core electrons
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