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| program progra
integer nwpawc,istat,icycle,i1,n0,years_numb
parameter (nwpawc=1000000)
common /pawc/ h(nwpawc)
real h,lampb,p,muge,mual
call hlimit(nwpawc)
call hropen(32,'tdir','atmo.hist','N',1024,istat)
call hbook1(1,'Spectrum Cs137',100,0.,800.,0)
e = 150.! Mev
mual = 1.317*0.1 ! cm2/g
rhoal = 2.7 ! g/cm3
muge = 0.225
rhoge = 5.323 ! g/cm3
dsd = 2.47 ! cm distance point sensitive surface of the detector
althick = 0.07 ! cm
gethick = 0.1 ! cm
dethick = 5.4 ! cm
detradius = 5.5/2. !!!cm
n0 = 1000000
pi =acos(-1.)
zref = dsd + dethick
eff = 0.
do i =1,n0
phi = 2.*pi*rndm(0)
theta = pi*rndm(0)
ux = sin(theta)*cos(phi)
uy = sin(theta)*sin(phi)
uz = cos(theta)
if(uz.lt.0.)then
t = (dsd-zref)/uz
xint = t*ux
yint = t*uy
zint = dsd
dd = sqrt(xint**2+yint**2)
if(dd.le.detradius)then
dnext= - 1./muge*log(rndm(0))
xnext = xint + dnext*ux
ynext = yint + dnext*uy
znext = zint + dnext*uz
if(znext.le.dethick.and.znext.ge.0.)then
dd = sqrt(xnext**2+ynext**2)
if(dd.le.detradius)then
dge = abs(gethick/uz)
dal = abs(althick/uz)
eff = eff + exp(-dge*muge-dal*mual)
end if
end if
end if
end if
end do
eff = eff/float(n0)
print *, eff
call hrout(0,icycle,' ' )
call hrend('tdir')
end |
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