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2. Radiation Protection
been recommended by ICRP as being the best way to correlate radiation exposure with
the risk of developing cancer.
The term “dose”, in units of Sievert (Sv), is applied to Effective Dose unless otherwise
stated. It applies to all exposure conditions, whether caused internally or externally, and
represents an absorbed dose weighted for different radiations and for the carcinogenic
biological sensitivity of different organs.
The Equivalent Dose HT,R(in Sv) received by tissue T which has been exposed to a dose
DT,R(in Gy) of radiation R is then specified using:
H T,R = wR DT,R
Table (2.1) Radiation Weighting Factors from [1], [2] and [4]. Note the changes in the values for
proton and neutron in the ICRP 103.
Radiation and energy range
X‐and � rays, electrons, positrons, muons
Protons and charged pions
α‐ particles, fission fragments, etc
Neutrons, En < 10 keV
10 < En < 100 keV
0.1 < En < 2 MeV
2 < En < 20 MeV
En > 20 MeV
w R
(NCRP
116)
1
2
20
5
10
20
10
5
w R
(ICRP
60)
1
5
20
5
10
20
10
5
w R
(ICRP
103)
1
2
20
A
continuous
function of
energy
Fig 2.1