Ion irradiation-induced structure damage to botanic samples using the ion transmission energy spectrum

In order to study the mechanism of irradiation-induced damage ofbotanic samples caused by low energy heavy ions, transmission energy spectrum mea-surement was performed. Kidney bean slice samples 100μm in thickness were irradi-ated by 50 kev N+ ions. The irradiation beam current density was about 30μA/cm2,and the irradiation ion doses were 1×1015, 1×1016, 3×1016 and 1×1017 ions@cm-2,respectively. A target set up that could greatly reduce the incident ion current densitywas designed to achieve the damage-free measurement. The 3.2 MeV H+ transmittedion energy spectrum measurement was carried out before and after the irradiation.From the transmission ion energy spectrum, it was found that the kidney bean sliceitself was structurally inhomogeneous compared with the PET films (C10HsO4). Ourresults indicated that the average mass thickness changed little when the N+ iondose was below 3×1016 ions.cm-2, but changed obviously whcn ion dose was beyond3×1016 ions.cm-2.

In order to study the mechanism of irradiation-induced damage of botanic samples caused by low energy heavy ions, transmission energy spectrum mea- surement was performed. Kidney bean slice samples 100 μm in thickness were irradi- ated by 50 keV N+ ions. The irradiation beam current density was about 30 μA/cm2, and the irradiation ion doses were 1×10~15, 1 × 10~16, 3×10~16 and 1× 10~17 ion ·cm-2, respectively. A target set up that could greatly reduce the incident ion current density was designed to achieve the damage-free measurement. The 3.2 MeV H+ transmitted ion energy spectrum measurement was carried out before and after the irradiation. From the transmission ion energy spectrum, it was found that the kidney bean slice itself was structurally inhomogeneous compared with the PET films (C10H8O4). Our results indicated that the average mass thickness changed little when the N+ ion dose was below 3×10 ~16 ionsocm2, but changed obviously when ion dose was beyond 3× 10~16 ions cm2。