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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:eeb9c551735bd0ab45890fc906baf874437271bf852063fccc60d822b2aaeaef"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "20: Nuclear radiation detectors and particle accelerators"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 20.1, Page number 390"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "h=6.626*10**-34;    #planck's constant(Js)\n",
+      "e=1.6*10**-19;   #conversion factor from J to eV\n",
+      "m=1.67*10**-27;    #mass of proton(kg)\n",
+      "E=30*10**6;   #energy(eV)\n",
+      "r=1.2*10**-15;   #radius of nucleon(m)\n",
+      "\n",
+      "#Calculation\n",
+      "lamdaP=h/math.sqrt(2*m*E*e);   #wavelength of proton(m)\n",
+      "lamdaAlpha=h/math.sqrt(2*4*m*E*e);   #wavelength of alpha particle(m)\n",
+      "a=2*r;    #size of nucleon(m)\n",
+      "\n",
+      "#Result\n",
+      "print \"wavelength of proton is\",round(lamdaP*10**15,1),\"*10**-15 m\"\n",
+      "print \"wavelength of alpha particle is\",round(lamdaAlpha*10**15,1),\"*10**-15 m\"\n",
+      "print \"size of nucleon is\",a,\"m\"\n",
+      "print \"alpha particle is better\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "wavelength of proton is 5.2 *10**-15 m\n",
+        "wavelength of alpha particle is 2.6 *10**-15 m\n",
+        "size of nucleon is 2.4e-15 m\n",
+        "alpha particle is better\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 20.2, Page number 391"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "q=1.6*10**-19;   #conversion factor from J to eV\n",
+      "B=2;   #magnetic field(T)\n",
+      "m=1.67*10**-27;    #mass of proton(kg)\n",
+      "R=0.25;   #radius(m)\n",
+      "a=6.24*10**12;   #conversion factor from J to MeV\n",
+      "\n",
+      "#Calculation\n",
+      "f=q*B/(2*math.pi*m);    #frequency needed(MHz)\n",
+      "KE=q**2*B**2*R**2/(2*m);   #kinetic energy(J)\n",
+      "KE=KE*a;     #kinetic energy(MeV)\n",
+      "\n",
+      "#Result\n",
+      "print \"frequency needed is\",round(f*10**-6,1),\"MHz\"\n",
+      "print \"kinetic energy is\",round(KE),\"MeV\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "frequency needed is 30.5 MHz\n",
+        "kinetic energy is 12.0 MeV\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file