New Hampshire Code of Administrative Rules
He - Department of Health and Human Services
Subtitle He-P - Former Division of Public Health Services
Chapter He-P 4000 - NEW HAMPSHIRE RULES FOR THE CONTROL OF RADIATION
Part He-P 4022 - SURVEYS AND MONITORING
Section He-P 4022.06 - Control of Access to Very High Radiation Areas; Irradiators

Universal Citation: NH Admin Rules He-P 4022.06

Current through Register No. 40, October 3, 2024

(a) This section shall apply to licensees or registrants with sources of radiation in non-self-shielded irradiators.

(b) This section shall not apply to sources of radiation that are used:

(1) In teletherapy;

(2) In industrial radiography; or

(3) In completely self-shielded irradiators in which the source of radiation is both stored and operated within the same shielding radiation barrier and, in the designed configuration of the irradiator, is always physically inaccessible to any individual and cannot create high levels of radiation in an area that is accessible to any individual.

(c) Each area in which there may exist radiation levels in excess of 5 Gy (500 rad) in one hour at one meter from a source of radiation that is used to irradiate materials shall meet the following requirements:

(1) Each entrance or access point shall be equipped with entry control devices which shall:

a. Function automatically to prevent any individual from inadvertently entering a very high radiation area;

b. Permit deliberate entry into the area only after a control device is actuated that causes the radiation level within the area, from the source of radiation, to be reduced below that at which it would be possible for an individual to receive a deep dose equivalent in excess of one mSv (0.1 rem) in one hour; and

c. Prevent operation of the source of radiation if it would produce radiation levels in the area that could result in a deep dose equivalent to an individual in excess of one mSv (0.1 rem) in one hour;

(2) Upon failure of the entry control devices to function as required by He-P 4022.06(c) (1) , additional control devices shall be provided so that:

a. The radiation level within the area, from the source of radiation, shall be reduced below that at which it would be possible for an individual to receive a deep dose equivalent in excess of one mSv (0.1 rem) in one hour; and

b. Conspicuous visible and audible alarm signals shall be generated to make:

1. An individual attempting to enter the area aware of the hazard; and

2. At least one other authorized individual, who is physically present, familiar with the activity, prepared to render or summon assistance, and is aware of the failure of the entry control devices;

(3) Upon failure or removal of physical radiation barriers other than a sealed source's shielded storage container, the licensee or registrant shall provide control devices so that:

a. The radiation level from the source of radiation shall be reduced below that at which it would be possible for an individual to receive a deep dose equivalent in excess of one mSv (0.1 rem) in one hour; and

b. Conspicuous visible and audible alarm signals shall be generated to make:

1. Potentially affected individuals aware of the hazard; and

2. The licensee or registrant or at least one other individual, who is familiar with the activity and prepared to render or summon assistance, aware of the failure or removal of the physical barrier;

(4) When a shield for stored sealed sources is a liquid, the licensee or registrant shall provide means to monitor the integrity of the shield and to signal, automatically, loss of adequate shielding;

(5) Physical radiation barriers that comprise permanent structural components, such as walls, that have no credible probability of failure or removal in ordinary circumstances shall not need to meet the requirements of He-P 4022.06(c) (3) and (4) ;

(6) Each area shall be equipped with devices that automatically generate conspicuous visible and audible alarm signals to:

a. Alert personnel in the area before the source of radiation can be put into operation; and

b. Allow time for any individual in the area to operate a clearly identified control device, which:

1. Shall be installed in the area; and

2. Shall prevent the source of radiation from being put into operation when the control device is actuated;

(7) Each area shall be controlled by use of such administrative procedures and such devices as are necessary to ensure that the area is cleared of personnel prior to each use of the source of radiation;

(8) Each area shall be checked by a radiation measurement prior to the first individual's entry into the area and after any use of the source of radiation to ensure that the radiation level from the source of radiation in the area is below that at which it would be possible for an individual to receive a deep dose equivalent in excess of one mSv (0.1 rem) in one hour;

(9) The entry control devices required in He-P 4022.05(c) (1) shall be tested for proper functioning:

a. Prior to initial operation with the source of radiation on any day, unless operations were continued uninterrupted from the previous day; and

b. Prior to resumption of operation of the source of radiation after any unintentional interruption;

(10) The licensee or registrant shall adhere to and submit to DHHS/RHS a schedule for periodic tests of the entry control and warning systems;

(11) The licensee or registrant shall not conduct operations, other than those necessary to place the source of radiation in safe condition or to effect repairs on controls, unless control devices are functioning properly;

(12) Entry and exit portals that are used in transporting materials to and from the irradiation area, and that are not intended for use by individuals, shall be controlled by such devices and administrative procedures as are necessary to physically protect and warn against inadvertent entry by any individual through these portals; and

(13) Exit portals for irradiated materials shall be equipped to detect and automatically signal the presence of any loose radioactive material that is carried toward such an exit to prevent loose radioactive material from being carried out of the area.

(d) Licensees, registrants, or applicants for licenses or registrations for sources of radiation within the purview of He-P 4022.06(c) which will be used in a variety of positions or in locations that make it impracticable to comply with certain requirements of He-P 4022.06(c) may apply to DHHS/RHS for approval of alternative safety measures.

(e) Alternative safety measures shall:

(1) Provide personnel protection at least equivalent to those specified in He-P 4022.06(c) ; and

(2) Have at least one of the alternative measures to include an entry-preventing inter-lock control based on a measurement of the radiation that ensures the absence of high radiation levels before an individual can gain access to the area where such sources of radiation are used.

(f) The entry control devices required by He-P 4022.06(c) and (d) shall not prevent an individual from leaving the area.

#5903, eff 2-1-95; ss by #6827, eff 8-6-98; ss by #8692, INTERIM, eff 7-27-06, EXPIRES: 2-2-07; ss by #8808, eff 1-24-07

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