JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="app">
    <div ng-controller="MainCtrl">
        <input type="radio" ng-model="checked" value="500" ng-click="uncheck($event)" />
        <input type="radio" ng-model="checked" value="1000" ng-click="uncheck($event)" />
        <input type="radio" ng-model="checked" value="1500" ng-click="uncheck($event)" />
    </div>
</div>

JavaScript

var app = angular.module('app', []);

app.controller('MainCtrl', ['$scope', function (scope) {
    scope.uncheck = function (event) {
        if (scope.checked == event.target.value) scope.checked = false
    }
}]);