Summary A level Physics - Nuclear

Nuclear Physics

, Radiation
Nuclear
22nd
January 202



Imited
by nuclei
of unstable aroms
>
-




·
Alpha 1 -

Licm
· Beta- (B) -
20cm -

3m

· (B")
Betat -
20cm -3m

Gamma (4) 1 km
-




Over




>>
Uses
-




o
Alpha smoke detectors -
least
penetrating
·
Beta : Thickness of paper-penetration depends on thickness



Gammas Thickness its the
of steel most
penetrating
· -




check
for cracks

Medical
therapy
>




·
Count Rate

Geigerdetects rate'
of
>
'count which
counter
gives
is the number pieces of radiation it
-

a


per unit time
.

>
-
Count Rate is Becqueres (BG)
1Bq =
1 per second/1

·
Activity
Number
of decays per unit time
of the
>
-
source


Unit :
Bq
.
- Sometimes
'disintegration' is used
for deeay
.
·
Irradiation
Radioactive
of the
> is
material
system
out
-




>
-



Not radioactive , doesn't affect the naceus of the atoms
.



exprotection : Shield (metal concrete) to radiation
, stop
reaching you .




·
Contaminations
Radioactive material is in on
body
.
=

your
or




> Protection : Gloves Suit Mask
tongs to substance
getting
-



stop in on
you
, , , or .
,