Radial bon can be measured according to activity, exposure, or its effect on bio
ID: 1063504 • Letter: R
Question
Radial bon can be measured according to activity, exposure, or its effect on biological tissue. Units of cures (Ci) and disintegrations per second (dps) measure activity. The rad measures exposure, where rad stands tor radiation absorbed dose the rem measures biological effect, where rem stands tor roentgen equivalent man. RBE is a multiplication factor known as relative biological effectiveness and a approximately 1 for beta and gamma radiation and 10 for alpha radiation. The following conversion factors relate these quantities: 1 Ci = 3.7 times 10^10 dps 1 rad = 1 times 10^-2 J/kg tissue number of rems = (RBE)(number of rads) Note that the conversion factors between curies and disintegrations per second 8nd between rads and joules per kilogram of tissue are exact (i.e.. they contain an infinite number of significant figures). The RBE, however is approximate and has only one significant because it varies with the dose rate, total dose, and type of tissue affected. The activity of a radiation source can also be expressed using the SI unit of a Becquerel (Bq). where 1 dps = 1 Bq Thus, 6.33 times 10^-2 dps = 6.33 times 10^-2 Bq. A 75-kg person is exposed to this radiation for 1.00 year (365 days), ff each alpha particle deposits 8.00 times 10^-13 J what is the number of reds absorbed by the parson? Express your answer in reds using two significant figures. This question will be shown after you compete previous question(s).Explanation / Answer
Deposited energy = 8*10-12 J
Energy deposited/ kg= 8*10-13/ 75 J/kg =1.066*10-14 J/kg
1*10-2 J/kg = 1 Rad
1.066*10-14 J/kg= 1*1.066*10-14/ 1*10-2 =1.066*10-12 Rad/ alpha particle
if the person is dosed with 1 alpha partcile/sec
then rads = 1.066*10-12*1*60*60*24*365 rada =3.36*10-5 Rad/year
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