Kansas Administrative Regulations
Agency 28 - DEPARTMENT OF HEALTH AND ENVIRONMENT
Article 35 - RADIATION
Section 28-35-144a - No Section Heading
Current through Register Vol. 43, No. 52, December 26, 2024
(a) As used in these regulations, the quality factors for converting absorbed dose to dose equivalent are shown in table I.
TABLE I QUALITY FACTORS AND ABSORBED DOSE EQUIVALENCIES
TYPE OF Quality Factor Absorbed Dose
RADIATION (Q) Equal to
a Unit Dose
Equivalent
X, gamma, or beta radiation and high-speed electrons 1 1
Alpha particles, multiple-charged particles, fission fragments and heavy particles of unknown charge 20 0.05
Neutrons of unknown energy 10 0.1
High-energy protons 10 0.1
a Absorbed dose in gray equal to 1 Sv or the absorbed dose in rad equal to 1 rem.
(b) If it is more convenient to measure the neutron fluence rate than to determine the neutron dose equivalent rate in sievert per hour or rem per hour, as provided in K.A.R. 28-35-144a(a), 0.01 Sv (1 rem) of neutron radiation of unknown energies may, for purposes of these regulations, be assumed to result from a total fluence of 25 million neutrons per square centimeter incident upon the body. If sufficient information exists to estimate the approximate energy distribution of the neutrons, the licensee or registrant may use the fluence rate per unit dose equivalent or the appropriate Q value from table II to convert a measured tissue dose in gray or rad to dose equivalent in sievert or rem.
TABLE II MEAN QUALITY FACTORS, Q, AND FLUENCE PER UNIT DOSE EQUIVALENT FOR MONOENERGETIC NEUTRONS
Fluence per Unit Fluence per Unit
Neutron Quality Dose Equivalentb Dose Equivalentb
Energy Factora (neutrons (neutrons (MeV)
(Q) cm-2 rem-1) cm-2 Sv-1)
(thermal)
2.5E-8 2 980E + 6 980E + 8
1E-7 2 980E + 6 980E + 8
1E-6 2 810E + 6 810E + 8
1E-5 2 810E + 6 810E + 8
1E-4 2 840E + 6 840E + 8
1E-3 2 980E + 6 980E + 8
1E-2 2.5 1010E + 6 1010E + 8
1E-1 7.5 170E + 6 170E + 8
5E-1 11 39E + 6 39E + 8
1 11 27E + 6 27E + 8
2.5 9 29E + 6 29E + 8
5 8 23E + 6 23E + 8
7 7 24E + 6 24E + 8
10 6.5 24E + 6 24E + 8
14 7.5 17E + 6 17E + 8
20 8 16E + 6 16E + 8
40 7 14E + 6 14E + 8
60 5.5 16E + 6 16E + 8
1E + 2 4 20E + 6 20E + 8
2E + 2 3.5 19E + 6 19E + 8
3E + 2 3.5 16E + 6 16E + 8
4E + 2 3.5 14E + 6 14E + 8
a Value of quality factor (Q) at the point where the dose equivalent is maximum in a 30-centimeter diameter cylinder tissue-equivalent phantom.
b Monoenergetic neutrons incident normally on a 30-centimeter diameter cylinder tissue-equivalent phantom.
