Simple experimental method for alpha particle range determination in lead iodide films.
An experimental method for determining the range of alpha particles in films based on I-V(s) analysis has been suggested. The range of 5.5 MeV alpha particles in PbI(2) films determined by this technique is 30+/-5 microm, and this value is in agreement with the value calculated by SRIM (the stopping and range of ions in matter), r=24 microm in PbI(2). More than 100 I-V(s) of PbI(2) films with different thicknesses and quality have been analyzed, and the influence of alpha particle radiation on PbI(2) I-V(s) curves has been studied. Developed analytical methods (dependence of current density on electric field and conception of surface defects) were used, and the method limitations are discussed. It was shown that I-V(s) demonstrate the tendency to obey Ohm's law under alpha radiation. On the other hand, dark conductivity of the lead iodide films shows a typical impure character that can lead to an overestimation of the alpha particles' range in PbI(2) films. After films were exposed to alpha radiation, the dark resistivity and I-V shape of some films improved. Also, a weak decrease of the charge carrier concentration, due to a decrease of the "surface defect" concentration ("surface refining"), was registered after successive measurements of I-V(s).
Dmitriev
Yuri
Y
Radiation Monitoring Devices Inc., Watertown, MA 02472, USA.
Bennett
Paul R
PR
Cirignano
Leonard J
LJ
Klugerman
Mikhail
M
Shah
Kanai S
KS
D000512:Alpha Particles; D004307:Dose-Response Relationship, Radiation; D005373:Film Dosimetry / Q000379:methods*; D007454:Iodides / Q000737:chemistry* / Q000528:radiation effects*; D007854:Lead / Q000737:chemistry* / Q000528:radiation effects*; D018499:Linear Energy Transfer; D011829:Radiation Dosage; D012542:Scattering, Radiation
D007454:Iodides; D007854:Lead