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Chapter 42: Q 33 Exercise (page 1237)
The doctors planning a radiation therapy treatment have determined that a 100 g tumour needs to receive 0.20 J of gamma
radiation. What is the dose in grays?
Hence, the dose in grays is 2 grays.
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A 1 Ci source of radiation is a significant source. 238 U is an alpha emitter. What mass of 238 U has an activity of 1 Ci?
What is the age in years of a bone in which the ratio is measured to be?
Calculate the chemical atomic mass of silicon.
1.5 Gy of gamma radiation are directed into a 150 g tumour
during radiation therapy. How much energy does the tumour
absorb?
| The element gallium has two stable isotopes: 69 Ga with an atomic mass of 68.92 u and 71 Ga with an atomic mass of 70.92 u. A periodic table shows that the chemical atomic mass of gallium is 69.72 u. What is the percent abundance of 69 Ga?
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