Standard Guidance for Dosimetry for Radiation Research

Importancia y uso:

4.1 Reliable dosimetry is indispensable for research on the effects of ionizing radiation on materials and products. Without reliable dosimetry valid conclusions cannot be reached, or the wrong conclusions might be reached.

4.2 This document is intended to provide direction on how to conduct dosimetry for research and experiments on the effects of ionizing radiation on materials and products, and on the reporting of dosimetry results. Requirements on dosimetry and on dose ranges might differ between the various types of experiments to be carried out.

4.3 Proper reporting of the manner in which the irradiation was carried out is important since the degree of radiation effect might be a function of various factors, other than absorbed dose, such as the radiation source, the absorbed-dose rate, energy of the incident radiation, ambient environmental conditions during irradiation, and the type of incident radiation. This document attempts to highlight the information, including the methodology and results of the absorbed-dose measurements, necessary for an experiment to be repeatable by other researchers.

4.4 In most cases an experiment should be designed to irradiate the sample as uniformly as possible. In practice, a certain variation in absorbed dose will exist throughout the sample. Absorbed-dose mapping is used to determine the magnitude, location, and reproducibility of the maximum (D_max) and minimum absorbed dose (D_min) for a given set of experimental parameters. Dosimeters used for dose mapping must be capable of operation over the expected range of doses and must have sufficient spatial resolution to determine likely dose gradients (see ASTM 52303).

4.5 Computer simulations might provide useful information about absorbed-dose distribution in the irradiated sample, especially near material interfaces (see ASTM E2232), but are not a substitute for dosimetry.

Subcomité:

E61.04

Volúmen:

12.02

Número ICS:

17.240 (Radiation measurements), 67.020 (Processes in the food industry)

Palabras clave:

absorbed dose; absorbed-dose mapping; absorbed-dose measurement; bremsstrahlung; dosimetry system; electron beam; gamma radiation; gamma rays; ionizing radiation; measurement uncertainty; radiation research; routine dosimeter; X-radiation; X-ray; ICS 17.240;