make Checkbox to work as radiobutton

JS

$scope.doctorStatus = [
     { title: "Available", checked: true },
     { title: "Busy", checked: false },
     { title: "NA", checked: false },
    ];
 
    $scope.UpdateSelection = function (position, itens, title) {
        angular.forEach(itens, function (subscription, index) {
            if (position != index)
                subscription.checked = false;
            else
                subscription.checked = true;
        }
        );
    }

HTML

<div class="card" ng-show="!callList.length">           
            <ion-item class="item-checkbox" ng-repeat="item in doctorStatus" style="padding:0 !important">
                <ion-checkbox ng-model="item.checked" ng-click="UpdateSelection($index, doctorStatus, item.title);">{{item.title}}</ion-checkbox>
            </ion-item>
 
        </div>