What is the measurement of 1 Curie?
1 Curie = 37 billion atomic disintegrations per second of a radioactive substance
[eg. 1 gram of Radium will undergo 3.7 x 1010 (37 billion) disintegrations in one second]
If 1 Ci = 37 GBq, what are the equivalent measurements of:
- 10 Ci
- 20 Ci
- 50 Ci
- 60 Ci
- 100 Ci
10 Ci = 370 GBq (10 x 37 GBq)
20 Ci = 740 GBq (20 x 37 GBq)
50 Ci = 1850 GBq (50 x 37 GBq)
60 Ci = 2200 GBq (60 x 37 GBq)
100 Ci = 3700 GBq (100 x 37 GBq)
What are the decay measurements of:
- 1 Bq (becquerel)
- 1 KBq (kilobecquerel)
- 1 MBq (megabecquerel)
- 1 GBq (gigabecquerel)
- 1 TBq (terabecquerel)
1 Bq = 1 dps (decay per second)
1 KBq = 1,000 dps [103]
1 MBq = 1,000,000 dps [106]
1 GBq = 1,000,000,000 dps [109]
1 TBq = 1,000,000,000,000 dps [1012]
What new SI unit is Characteristic Intensity typically measured in?
Sieverts (Sv) per hour at 1 metre
*can also be seen (converted) as mSv/hr @ 1 m
What old CGS unit is Characteristic Intensity typically measured in?
Roentgens (R) per hour at 1 metre
*can also be seen (converted) as mR/hr @ 1 m
Assuming we have 37 GBq (1 Ci) of a radioactive source, what is the Characteristic Intensity and Half-Life of:
Selenium 75
Characteristic Intensity:
- 20 R/hr @ 1 metre
- 05 mSv/hr @ 1 metre
Half-Life:
120 days
Assuming we have 37 GBq (1 Ci) of a radioactive source, what is the Characteristic Intensity and Half-Life of:
Cobalt 60
Characteristic Intensity:
- 35 R/hr @ 1 metre
- 36 mSv/hr @ 1 metre
Half-Life:
- 3 years
(1934. 5 days)
Assuming we have 37 GBq (1 Ci) of a radioactive source, what is the Characteristic Intensity and Half-Life of:
Iridium 192
Characteristic Intensity:
- 55 R/hr @ 1 metre
- 15 mSv/hr @ 1 metre
Half-Life:
74 days
Some radiation is more damaging than others because of their Quality Factor (Q) or Relative Biological Effectiveness (RBE).
What are some of the common RBE values?
(Hint: They’re found in a short chart form.)
