For the purposes of carrying out the duties of this chapter, the Commissioner may appoint an advisory board composed of persons with demonstrated expertise in such matters. The Department shall assist the board in its administrative and technical duties. The membership of the board shall include (i) a citizen appointed by the Commissioner, (ii) a psychiatrist or psychologist licensed to practice in the Commonwealth who is skilled in the diagnosis of mental abnormalities and personality disorders associated with violent sex offenders and who is a full-time employee of the Department of Corrections, to be appointed by its director, (iii) a member of the Department of State Police, and (iv) such other members as deemed appropriate by the Commissioner. Members of the board shall exercise their powers and duties without compensation, except that members of the board who are not state employees shall be reimbursed by the Department for their approved travel expenses to the meetings of this board at the approved state rate. Members of the board shall be immune from personal liability while acting within the scope of their duties except for intentional misconduct.