Polyacetylene films were doped with FeCl₃ and implanted with 30 keV K⁺ ions. Physical changes to the films were examined by a series of measurements, which include the four-probe test, infrared ray absorption and 2 MeV He⁺ particle elastic recoil dettection and Rutherford backscattering. The chemical dopants (Fe⁺⁺⁺ and Cl^-) were redistributed after the implantation and the different species (K⁺, Fe⁺⁺⁺ and Cl^- ions) formed p-n junctions at the implantation depths. The implanted films exhibited desirable I - V characteristics, with current densities as high as 600 mA/cm^- at 3V and back - to - forward ratio of current over 300. The polymer diodes kept their behavior for over 60 days. Discussions on the results were given in detail.

An external proton beam system with a detection sensitivity of 10^-11g for ruthenium was used to study DNA. A metal- organic compound tris (4,7- diphenylphenanthroline) ruthenium (Ⅱ) [Ru(DiP)32+] was chosen as a metal marker. The target DNA labeled with Ru(DiP)32+ was electrophoresed in an agarose gel and then was analysed by PIXE. The DNA sample with the metal marker showed clearly Ru peaks in the PIXE spectra, while the control showed no Ru peak at all. This method can be used to study biology at the DNA level.

This paper describes the scanning nuclear microprobe facilities established at the Shanghai Institute of Nuclear Research. The Russion quadruplet constructed with four magnetic quadrupolets is used for microbeam formation. The long focus of the lens makes the working distance long enough to accommodate the scanning coils and the detectors for PIXE, RBS, RFS, NRA and SE experiments. A 5 µ m focussed beam is scanned continously by a pair of coils. A multiparameter multidetector data system for the nuclear microprobe is based on the idea of Total quantitative scanning analysis (TQSA) suggested by Melbourne University. A digital graphic displayer is a good substitute for an ordinary storage oscilloscope for on- line scanned area monitoring. The new microprobe meets high demands of biologists and geologists on applications.

The MeV proton non- Rutherford elastic backscattering (PEBS) has been used to measure a variety of low Z element- containing samples including thick SiC film, N implanted stainless steel, thin films interface (Ag on Cu) and very deep (4µ m) SOI structure by high energy oxygen implantation. It is demonstrated that by using the significant enhancement of cross sections for low Z elements and selecting the proper energy region of the excitation curves both the sensitivities for detecting low Z elements and the accessible depth of the PEBS technique are remarkablely improved over the ordinary RBS method. The disadvantages of the PEBS as compared with RBS as well as high energy He elastic backscattering (HeEBS) are also discussed.

The reflection of light ions, such as H⁺, ³He⁺ and ⁴He⁺, with energies of 0.1- 10 keV, from Cu and Ni surface has been studied by Monte Carlo simulation and transport theory. The Monte Carlo simulation gives the detail energy spectra for the reflected particles and their angular distribution for different incident angles. It shows that the reflected particle energy spectra can be approximately described by an analytical formula for the whole energy range, all the incident angles and different ion- target combination studied here. The reflected particle energy vs its average reflection angle to the surface normal can almost be expressed by a universal curve for all cases studied here. The reflection energy spectra are used for the calculation of the reflection coefficient by transport theory including the realistic surface correction. The present work is compared with both experimental measurement and other simulation codes.

The influence of irradiation on biosyntheses of ascorbic acid and riboflavin in germinating chickpea seeds at ambient (25— 35℃) conditions, was investigated. The rate of syntheses of these vitamins significantly increased with increasing germination time upto 120 h depending upon the treatment (P<0.05). Maximum amounts of ascorbic acid, 22.32 and 16.84 mg/100g, were found in the 0.10 kGy sample after 120 h of germination in tap and distilled water respectively. However, a radiation dose of 0.15 kGy resulted in the development of maximum values of riboflavin, 11.40 and 11.38μ g/g, on germination in tap and distilled water respectively. A significant linear relation(r=0.954 to 0.997) was observed between the biosyntheses of these vitamins and the germination time upto 120 h of irradiated and unirradiated chickpea seed (P<0.05).

Almond, groundnut, pinenut and walnut, were radiated (0.25 kGy) after packing in coloured and clear polyethylene bags (0.04mm) and subsequently stored for 24 weeks at room (16- 36℃) and low temperatures (10- 20℃). The effect of these treatments on insect infestation and quality was studied. It was observed that radiation (0.25 kGy) treatment in combination with low temperature (10- 20℃) completely checked the insect infestation of nuts during 24 weeks of storage. Peroxidation was higher in samples stored at room than at low temperature. Storage period had a marked adverse influence on sensory quality of nuts, however, samples kept at low temperature were comparatively rated higher.

This paper compared various correlation of IMRA for CA19- 9 and CA50 in the digestive system tumour antigen, such as linearity, sensitivity, analytical range, precision as well as storage and stability and so on. And it also determined serum level of CA19- 9 and CA50 of patients with different tumours. The results showed it was well correlated to CA19- 9 and CA50 as a marker of digestive system tumour. Particularly high levels of both markers were found in patients with pancreastic colonic cancer. Therefore it is possible to obtain a higher sensitivity and acceptable specificity by combination with CA19- 9 and CA50.

1,1,1,- Trifluoro- 2- substituted- phenyl- 2- propanols- 3- ¹⁴C were prepared from addition of methyl- ¹⁴C magnesium iodide to appropriate trifluoroacetophenone. These alcohols were converted into tosylates by reaction with n - butyllithium and then with p- toluenesulfonyl chloride. The yield, boiling point or melting point and pertinent spectral data of these compounds are reported.

The fate of fenitrothion in rice- fish ecosystem was studied using ¹⁴C- fenitrothion (¹⁴C- F) labelled at methoxyl and two application rates. The fenitrothion in water disappeared quickly, only 8 and 11 ppb in two treatments at harvest were detected respectively. Most of ¹⁴C- F in soil existed in upper layer and that in plants appeared in shoots. The extractable residues in cargo rice were 0.36 and 0.58 ppm in two treatments respectively. ¹⁴C- residues (¹⁴C- R) were concentrated in bones, next viscera, meat and scales. Total ¹⁴C- R in meat were 0.92 and 1.77 ppm at harvest. Comparing two treatments, the residue dynamics of fenitrothion in water, soil, plants and fish were similar. ¹⁴C- R in water and soil after harvest affected the rice- fish ecosystem in the next season. However, the extractable ¹⁴C- R in cargo rice, soil and water were very low.

In this paper, the comparison of absorbed dose measurement performed with an extrapolation chamber and a Farmer chamber in high energy electron beam is described. The experiments performed in the course of this work show that the Xinjiang extrapolation chamber is suitable for calibration of high energy electron beams produced from medical linear accelerators.