Assimilation of simple carbohydrate by root uptake was examined by cultivation of radish seedling in a solution containing glucose labeled with14C. Activity in plant increased rapidly and showed 10 to 30 percent of that in the culture solution within 1 h. Activity in plant, however, did not exceed that in the solution after 11 days cultivation, indicating assimilation of glucose by root uptake is negligible under photosynthesis is active.
This paper describes a computer program for the classification of a surface contamination with radioisotopes to record numerous events from contamination to decontamination using a personal computer. This software enables a staff to print out numbers and contents of contantinations according to indices as well as whole data concerning each contamination. The relationships among causes of contamination, places contaminated and so on were easily analyzed. The data of comtamination were utilized for training users to handle radioisotopes more safely.
As muons which are a major component of cosmic rays at the ground level have strong penetrating ability, they are possibly utilized as a radiation source for non-destructive inspection of large materials or geological survey. To examine the feasibilities of them, we developed a cosmic ray measuring system using the coincidence counting method with two largearea plastic scintillators. After some fundamental tests, cosmic ray angular distribution (for zenith angle) measurement was made in an underground tunnel. The data obtained well represented the topography above the tunnel.
A preliminary study was carried out to evaluate whether the blood flow (F) of the femoral head can be measured by PET on the subjects (6 males, aged 54-84, mean 69.3 years) with prostate disorders (no bone lesions) . For the F study, C15O2was inhaled in a single breath with dynamic scan for 5 minutes. The blood volume (V) was determined by the C15O study. The F (mean±1 s.d.) was 14.0±7.8 ml/100 ml [tissue] /min, the partition coefficient was 0.112±0.054, and the V was 2.23±0.56 ml/100 ml.