# Chapte16-Chemical &Biological Effects of Radiations¶

## Ex1-pg672¶

In [1]:
## Exa16.1 : : Page-672 (2011)
import math
R_c_gy = 25e-03; ## Dose in centigray
R_Sv = 25*10**-2  ## Dose in milli sieverts
print'%s %.2f %s  %.2f %s'%("\n25 mrad = ",R_c_gy,"" and " cGy =",R_Sv," mSv");

## Results
## 25 mrad = 3e-002 cGy = 0.25 mSv

25 mrad =  0.03   0.25  mSv


## Ex2-pg673¶

In [2]:
## Exa16.2 : : Page-673 (2011)
#find 100 mega becquerel
import math
BC_conv = 100*1e+009/3.7e+10;        ## Becquerel curie conversion, milli curie
print'%s %.2f %s'%("\n100 mega becquerel = ",BC_conv," milli curie ")

## Results
## 100 mega becquerel = 2.7 milli curie

100 mega becquerel =  2.70  milli curie


## Ex4-pg673¶

In [3]:
## Exa16.4 : : Page-673 (2011)
#find The requiresd liver dose
import math
A = 80*10**6;        ## Activity, becquerel
t_half = 6*3600.;    ## Half life, s
N = A*t_half/0.693;    ## Number of surviving radionuclei
E_released = 0.9*N*(140e+03)*1.6e-19;    ## Energy released, joule
m_l = 1.8;                    ## Mass of liver of average man, Kg
liv_dose = E_released*10**2/m_l;    ## Liver dose, centigray
print'%s %.2f %s'%("\nThe requiresd liver dose = ",liv_dose," cGy");

## Result
## The requiresd liver dose = 2.8 cGy

The requiresd liver dose =  2.79  cGy