Physics and Radiobiology of Nuclear Medicine
Units of Radioactivity The unit of radioactivity is a curie. It is defined as 1 curie (Ci) =3.7 × 1010 disintegrations per secon ...
Specific activity is at times expressed as radioactivity per mole of a labeled compound, for example, mCi/mole (MBq/mole) or mCi ...
Answer For^201 Tl, A= 10 ×3.7 × 107 =3.7 × 108 dps Using Eq. (3.2), Because 1 g · atom^201 Tl =201 g^201 Tl =6.02 × 1023 atoms o ...
Using Eq. (3.4) At= 150 ×e−0.1155×^5 = 150 ×e−0.5775 = 150 ×0.5613 =84.2 mCi (3.1 GBq) at 3 p.m. Problem 3.3 If a radionuclide d ...
(3.14) By integration, Eq. (3.14) becomes (3.15) Equation (3.15) gives the activity of the daughter nuclide dat time tas a resul ...
Successive Decay Equations 31 Fig. 3.4. Plot of activity versus time on a semilogarithmic graph illustrating the tran- sient equ ...
Secular Equilibrium When ld>>lp, that is, when the parent half-life is much longer than that of the daughter nuclide, in E ...
A radiopharmaceutical has a biologic half-life of 10 hr in humans and a physical half-life of 23 hr. What is the effective half ...
4 Statistics of Radiation Counting 34 As mentioned in previous chapters, radioactive decay is a random process, and therefore on ...
Mean and Standard Deviation When a series of measurements is made on a radioactive sample, the most likely value of these measur ...
standard deviation on either side of the mean, that is, within the range ±s; 95% of all measurements fall within the range ± 2 s ...
Standard Deviation of Count Rates The standard deviation of a count rate is where sis the standard deviation of the total countn ...
Problem 4.3 A radioactive sample and the background were counted each for 5 min and found to give 8000 counts and 3000 counts, r ...
Net thyroid count =40,000 − 2000 =38,000 = 205 Percent thyroid uptake Standard deviation in uptake [using Eq. (4.7)] =0.427 ×0.0 ...
In Table 4.1, for a series of eight measurements, (degrees of freedom 7), there is a 50% chance of the value of chi-square being ...
Problem 4.5 The following repeat counts of a radioactive sample were obtained in a well-counter. Use the c^2 test to see if the ...
those having the disease in a diseased population (true positive, TP). The specificity of the test is the probability of being a ...
Answer True positive = 780 True negative = 160 − 15 = 145 False negative = 840 − 780 = 60 False positive = 15 Questions Define ...
5 Production of Radionuclides 44 More than 3000 nuclides are known, of which approximately 2700 are radioactive, and the rest ar ...
leading to the formation of different nuclides. As the energy of the irradi- ating particle is increased, more nucleons are emit ...
«
1
2
3
4
5
6
7
8
9
10
»
Free download pdf