Ohio Administrative Code
Title 3701:1 - Radiation Control
Chapter 3701:1-38 - General Radiation Protection Standards for Sources of Radiation
Section 3701:1-38-11 - Radiation protection standards, general provisions
Current through all regulations passed and filed through March 18, 2024
(A) Quality factors for converting absorbed dose to dose equivalent are as follows:
Type of radiation | Quality factor (Q) | Absorbed dose equal to a unit dose equivalentA/ |
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 one sievert or the absorbed dose in rad equal to one 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 paragraph (A) of this rule, 0.01 sievert (one rem) of neutron radiation of unknown energies may, for purposes of these regulations, be assumed to result from a total fluence of twenty-five million neutrons per square centimeter incident upon the body. If sufficient information exists to estimate the approximate energy distribution of the neutrons, the licensee may use the fluence rate per unit dose equivalent or the appropriate Q value as provided in this paragraph to convert a measured tissue dose in gray or rad to dose equivalent in sievert or rem as follows:
Neutron energy (MeV) | Quality factorA/ (Q) | Fluence per unit dose equivalentB/ (neutrons cm-2 rem-1) | Fluence per unit dose equivalentB/ (neutrons cm-2 Sv-1) | |
(Thermal)........ | 2.5 x10-8 | 2 | 980x106 | 980x108 |
1x10-7 | 2 | 980x106 | 980x108 | |
1x10-6 | 2 | 810x106 | 810x108 | |
1x10-5 | 2 | 810x106 | 810x108 | |
1x10-4 | 2 | 840x106 | 840x108 | |
1x10-3 | 2 | 980x106 | 980x108 | |
1x10"-2 | 2.5 | 1010x106 | 1010x108 | |
1x10"-1 | 7.5 | 170x106 | 170x108 | |
5x10"-1 | 11 | 39x106 | 39x108 | |
1 | 11 | 27x106 | 27x108 | |
2.5 | 9 | 29x106 | 29x108 | |
5 | 8 | 23x106 | 23x108 | |
7 | 7 | 24x106 | 24x108 | |
10 | 6.5 | 24x106 | 24x108 | |
14 | 7.5 | 17x106 | 17x108 | |
20 | 8 | 16x106 | 16x108 | |
40 | 7 | 14x106 | 14x108 | |
60 | 5.5 | 16x106 | 16x108 | |
1x102 | 4 | 20x106 | 20x108 | |
2x102 | 3.5 | 19x106 | 19x108 | |
3x102 | 3.5 | 16x106 | 16x108 | |
4x102 | 3.5 | 14x106 | 14x108 |
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.
(C) For the purpose of Chapter 3701:1-38 of the Administrative Code, activity is expressed in the SI unit of becquerel, Bq, or in the special unit of curie, Ci, or their multiples, or disintegrations or transformations per unit of time.
(D) Radiation protection programs.
Five Year Review (FYR) Dates:
1/24/2022 and
01/20/2027
Promulgated
Under:
119.03
Statutory Authority:
3748.04
Rule Amplifies:
3748.04
Prior Effective Dates: 07/22/2001, 10/22/2006,
09/01/2011