Standard Practice for Use of the Ethanol-Chlorobenzene Dosimetry System

Importancia y uso:

4.1 The ECB dosimetry system provides a reliable means of measuring absorbed dose to water. It is based on a process of radiolytic formation of hydrochloric acid (HCl) in aqueous ethanolic solutions of chlorobenzene by ionizing radiation ((7, 8), ICRU 80).

4.2 The dosimeters are partly deoxygenated solutions of chlorobenzene (CB) in 96 volume % ethanol in an appropriate container, such as a flame-sealed glass ampoule. Radiation chemical yields (G) for the formation of HCl in typical ECB solution formulations are given in Table 1.

(A) The ratio of the photon mass energy-absorption coefficients for water and the dosimeter solution at ⁶⁰Co gamma ray energy:


(B) Radiation chemical yield of HCl in the dose range from 100 Gy to 100 kGy.(C) Upper dose range 20 kGy.(D) Lower dose range 1 kGy. This formulation also contained 0.04 % acetone and 0.04 % benzene.

4.3 The irradiated solutions indicate absorbed dose by the amount of HCl formed. A number of analytical methods are available for measuring the amount of HCl in ethanol (10).

4.4 The concentration of chlorobenzene in the solution can be varied so as to simulate a number of materials in terms of the photon mass energy-absorption coefficients (μ_en/ρ) for X- and gamma radiation, and electron mass collision stopping powers (S/ρ), over a broad energy range from 10⁻² to 100 MeV (11-14).

4.5 The ECB dosimetry system may be used with other radiation types, such as neutrons (15) and protons (16). Meaningful dosimetry of any radiation types and energies novel to the system's use requires that the respective radiation chemical responses applicable under the circumstances be established in advance.

Subcomité:

E61.02

Volúmen:

12.02

Número ICS:

17.240 (Radiation measurements)

Palabras clave:

absorbed dose; dose; dose measurement; dosimeter; dosimetry system; ECB; electron beam; ethanol-chlorobenzene dosimeter; gamma radiation; ICS 17.240; ionizing radiation; irradiation; photons; radiation; radiation processing; reference-standard dosimeter; X-radiation;