The measurement system for Doppler broadening profiles of annihilation radiations was developed. This system reads out data for energies of r-rays from an analog to digital converter and those for specimen temperature from a digital-voltmeter coupled to a thermocouple. These two types of digital-quantities were stored in a memory matrix of 512 channels (energy) ×128 channels (temperature) ×4 byte (count) . For this purpose, a memory board of 256 kbyte with 32-dynamic RAMs (64 kbits) was used. The data acquisition was controlled by a microcomputer. Temperature of the specimen was controlled by a programmable temperature controller, thus it can be varied in a desired way. This was useful for measurements in repeated temperature cycles. A sample heater with a compact size was developed in order to obtain a homogeneous temperature distribution in the specimen. Application of this system for a study of thermal vacancies in Al-dilute alloys was also shown.
Ingestion of 210Pb in Akita City, northern Japan was studied with food category samples and total diet samples by means of a low energy photon spectrometry. Results for food category samples revealed that the contribution of marine products to total 210Pbingestion was the largest. Mean 210Pb ingestion of the two total diet samples was found to be 0.19 Bq d-1, and approximately 1/3 of a previous reported value which was cited in an UNSCEAR report as an example of high 210Pbingestion by marine foods consumption.
We have developed a personal computer system using a commercial spreadsheet software. This system is applicable to management of radioactive wastes and measurement at pertinent points (surface contamination and radiation dose) . As the result of our experience, we have found that the spreadsheet software is quite satisfactory for radiation protection management and that it has advantages in some aspects against other so f twares by programming language.