Kan. Admin. Regs. § 28-35-144a

Current through Register Vol. 44, No. 2, January 9, 2025

Section 28-35-144a - No Section Heading

(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.

Kan. Admin. Regs. § 28-35-144a

Authorized by and implementing K.S.A. 1993 Supp. 48-1607; effective Oct. 17, 1994.