International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

International Tables for Crystallography (2006). Vol. C, ch. 10.1, p. 958

## Section 10.1.1.1. Ionizing radiation

D. C. Creagha and S. Martinez-Carrerab

aDivision of Health, Design, and Science, University of Canberra, Canberra, ACT 2601, Australia, and bSan Ernesto, 6-Esc. 3, 28002 Madrid, Spain

#### 10.1.1.1. Ionizing radiation

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Ionizing radiation is defined as radiation that by its nature and energy has the capacity to interact with and remove electrons from (i.e. ionize) the atoms of substances through which the radiation passes. Sufficiently energetic radiations may cause permanent changes in the nuclei of the atoms of the substance. Radiation may be propagated in the form of electromagnetic radiation (X-rays and γ-rays) or particles (β and α particles, neutrons, protons, and other nuclear particles).

In the list of definitions that follows SI units will be used. The relation between these SI units and the earlier system of units is given in Table 10.1.1.

 Table 10.1.1| top | pdf | The relationship between SI and the earlier system of units
QuantitySIEarlier
Absorbed dose
[gray (Gy = J kg−1)]
1 J kg−1
0.01 J kg−1
100 rad
1 rad
Activity [becquerel
(Bq = s−1)]
1 Bq
3.7 × 1010 Bq
2.7 × 1011 Ci
1 Ci
Dose equivalent
[sievert (Sv = J kg−1)]
1 Sv
0.01 Sv
100 rem
1 rem
Exposure 1 C kg−1
2.58 × 10−4 C kg −1
3876 R
1 R